.TH smenu 1
.SH NAME
smenu - filter that allows one to interactively select a word from stdin
and outputs the selection to stdout.
.SH SYNOPSIS
.nf
  [\fB*-h\fP|\fB-help\fP]
  [\fB*-H\fP|\fB-long_help\fP]
  [\fB*-?\fP|\fB-u\fP|\fB-usage\fP]
  [\fB*-V\fP|\fB-version\fP]
  [\fB-n\fP|\fB-lines\fP|\fB-height\fP [\fIheight\fP]]
  [\fB-i\fP|\fB-in\fP|\fB-inc\fP|\fB-incl\fP|\fB-include\fP... \fIregex\fP]
  [\fB-e\fP|\fB-ex\fP|\fB-exc\fP|\fB-excl\fP|\fB-exclude\fP... \fIregex\fP]
  [\fB-m\fP|\fB-msg\fP|\fB-message\fP|\fB-title\fP \fImessage\fP]
  [\fB-!\fP|\fB-int\fP|\fB-int_string\fP [\fIstring\fP]]
  [\fB-a\fP|\fB-attr\fP|\fB-attributes\fP \fIprefix:attr\fP...]
  [\fB-1\fP|\fB-l1\fP|\fB-level1\fP \fIregex\fP [\fIattr\fP]]
  [\fB-2\fP|\fB-l2\fP|\fB-level2\fP \fIregex\fP [\fIattr\fP]]
  [\fB-3\fP|\fB-l3\fP|\fB-level3\fP \fIregex\fP [\fIattr\fP]]
  [\fB-4\fP|\fB-l4\fP|\fB-level4\fP \fIregex\fP [\fIattr\fP]]
  [\fB-5\fP|\fB-l5\fP|\fB-level5\fP \fIregex\fP [\fIattr\fP]]
  [\fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP [\fIdelim\fP]]
  [\fB-z\fP|\fB-zap\fP|\fB-zap_glyphs\fP \fIbytes\fP]
  [\fB-P\fP|\fB-pm\fP|\fB-pin\fP|\fB-pin_mode\fP [\fIdelim\fP]]
  [\fB-p\fP|\fB-at\fP|\fB-auto_tag\fP]
  [\fB-N\fP|\fB-number\fP... [\fIregex\fP...]]
  [\fB-U\fP|\fB-unnumber\fP... [\fIregex\fP...]]
  [\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP]
  [\fB-D\fP|\fB-data\fP|\fB-options\fP [\fIparameter\fP...]
  [\fB-b\fP|\fB-blank\fP]
  [\fB-M\fP|\fB-middle\fP|\fB-center\fP]
  [\fB-d\fP|\fB-restore\fP|\fB-delete\fP|\fB-clean\fP|\
\fB-delete_window\fP|\fB-clean_window\fP]
  [\fB-c\fP|\fB-col\fP|\fB-col_mode\fP|\fB-column\fP]
  [\fB-l\fP|\fB-line\fP|\fB-line_mode\fP]
  [\fB-t\fP|\fB-tab\fP|\fB-tab_mode\fP|\fB-tabulate_mode\fP [\fIcols\fP]]
  [\fB-w\fP|\fB-wide\fP|\fB-wide_mode\fP]
  [\fB-C\fP|\fB-cs\fP|\fB-cols\fP|\fB-cols_select\fP... \fIselector\fP...]
  [\fB-R\fP|\fB-rs\fP|\fB-rows\fP|\fB-rows_select\fP... \fIselector\fP...]
  [\fB-A\fP|\fB-fc\fP|\fB-first_column\fP \fIregex\fP]
  [\fB-Z\fP|\fB-lc\fP|\fB-last_column\fP \fIregex\fP]
  [\fB-g\fP|\fB-gutter\fP [\fIstring\fP]]
  [\fB-k\fP|\fB-ks\fP|\fB-keep_spaces\fP]
  [\fB-W\fP|\fB-ws\fP|\fB-wd\fP|\fB-word_delimiters\fP|\
\fB-word_separators\fP \
\fIbytes\fP]
  [\fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\
\fB-line_separators\fP \
\fIbytes\fP]
  [\fB-q\fP|\fB-no_bar\fP|\fB-no-scroll_bar\fP]
  [\fB-S\fP|\fB-subst\fP... \fI/regex/repl/opts\fP]
  [\fB-I\fP|\fB-si\fP|\fB-subst_included\fP... \fI/regex/repl/opts\fP]
  [\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP... \fI/regex/repl/opts\fP]
  [\fB-/\fP|\fB-search_method\fP \fIprefix\fP|\fIsubstring\fP|\fIfuzzy\fP]
  [\fB-s\fP|\fB-sp\fP|\fB-start\fP|\fB-start_pattern\fP \fIpattern\fP]
  [\fB-x\fP|\fB-tmout\fP|\fB-timeout\fP \fItype\fP [\fIword\fP] \fIdelay\fP]
  [\fB-X\fP|\fB-htmout\fP|\fB-hidden_timeout\fP \fItype\fP [\fIword\fP] \
\fIdelay\fP]
  [\fB-r\fP|\fB-auto_validate\fP]
  [\fB-v\fP|\fB-vb\fP|\fB-visual_bell\fP]
  [\fB-Q\fP|\fB-ignore_quotes\fP]


  selectors ::= \fIcol1\fP[-\fIcol2\fP],...|\fIrow1\fP[-\fIrow2\fP],...|\
\fIRE\fP,...
  parameter ::= [l|r:<char>]|[a:left|right]|[p:included|all|[w:<num>]|
                [f:yes|no]|[o:<num>[+]]|[n:<num>]|[i:<num>]|[d:<char>]|
                [s:<num>]|[h:trim|cut|keep]
  attr      ::= [fg][/bg][,style]
  RE        ::= \fB<char>\fIregex\fB<char>\fR

  selectors and RE can be freely mixed.
  <char> in RE is any non-blank ASCII character except ','.
.fi

Note that some parameters require that others have been previously
entered in the command line to be accepted.
.SH DESCRIPTION
This small utility acts as a filter when no input file is given
(reads from stdin and writes to stdout) or takes its inputs from that file.

All the words read are presented in a scrolling window on the terminal
\fBat the current cursor position\fP without having previously cleared
the screen.
.PP
The selection cursor is initially positioned on the first selectable word
by default.
.PP
There are options to explicitly or implicitly include or exclude words
using extended regular expressions.
Note that when some words are explicitly excluded they can no longer be
re-included after.
.PP
Excluded words are skipped when the selection cursor is moved and cannot
be searched for.
.PP
The \fB-W\fP|\fB-ws\fP|\fB-wd\fP|\fB-word_delimiters\fP|\fB-word_separators\fP
option can be used to set the characters (or multibyte
sequences) which will be used to delimit the input words.
The default delimiters are: \fISPACE\fP, \fI\\t\fP and \fI\\n\fP.
.PP
The
\fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\fB-line_separators\fP
has a similar meaning for lines.

Special character sequences formed by a \fI\\\fP followed by one of the
characters \fIa\fP \fIb\fP \fIt\fP \fIn\fP \fIv\fP \fIf\fP \fIr\fP and
\fI\\\fP are understood and have their traditional meanings.

UTF-8 sequences introduced by \fI\\u\fP and \fI\\U\fP are also understood.

\fBWarning\fP, when used together, it is important to know that all
sequences starting with \fI\\U\fP will be interpreted before the start
of interpretation of sequences starting with \fI\\u\fP.

\fI\\u\fP can be followed by 2,4,6 or 8 hexadecimal characters composing
an UTF-8 bytestring.
Here is an example of using \fI\\u\fP to compose a lowercase latin
e with acute accent: \fI\\uc3a9\fP.

\fI\\U\fP must be followed by exactly 6 hexadecimal digits, including
leading zeros, that represent a unicode codepoint according to ISO
10646 UCS-4.
The lowercase latin e with acute of the previous example (codepoint
\fBU+00E9\fP) can then be represented using the notation: \fI\\U0000e9\fP.
.PP
Note that with most shells, the \fI\\\fP before \fIu\fP and \fIU\fP
need to be protected or escaped.
.PP
Quotations (single and double) in the input stream can be used to ignore
the word separators so that a group of words are taken as a single entity.
.PP
Non printable characters in words that are not delimiters are
converted to their traditional form (\fI\\n\fP for end-of-line,
\fI\\t\fP for tabulation...) by default.
.PP
An invalid UTF-8 sequence or other non-printable character will be
replaced by a dot (\fI.\fP) by default.
.PP
There is nevertheless a possibility to change this substitution character
with another \fBASCII\fP printable one with the help of the command line
option \fB-.\fP|\fB-dot\fP|\fB-invalid\fP.
.PP
\fBWarning\fP, \fBUTF-8\fP encoded codepoints are quietly converted
into the substitution character when the user locale is not \fBUTF-8\fP
aware like \fBPOSIX\fP or \fBC\fP by example.
.PP
Words containing only spaces, entered directly or resulting from a
substitution, are also rejected unless they are not selectable.
This allows special effects like creating blank lines for example.
These words are also kept in column mode, selectable or not.
.PP
smenu has an option to define a set of characters or UTF-8 sequences
which should be ignored when reading words.
This can be very useful when dealing with inputs where the EOL sequence
consists in more than one character.
.PP
A typical example is DOS or Windows files with lines ending with
\fICRLF\fP.
In such a case one might decide to ignore all \fICR\fP characters from
the input.
.PP
.SS "Moving among words"
The cursor can be moved in every direction by using the
keyboard arrow keys (\fB\(<-\fP,\fB\(da\fP,\fB\(ua\fP,\fB\(->\fP)
or the \fIvi\fP direction keys (\fBh\fP, \fBj\fP, \fBk\fP and \fBl\fP).
\fBHOME\fP, \fBEND\fP, \fBPgDn\fP and \fBPgUp\fP can also be used,
if available, and have the following meanings:
.TS
tab(@);
l l.
\fB\(<-\fP, \fBh\fP@Previous word
\fBCTRL\ \(<-\fP, \fBH\fP@Start of line
\fB\(ua\fP, \fBk\fP@Previous line
\fBPgUp\fP, \fBK\fP@Previous page
\fBHOME\fP@First word of the window
\fBCTRL\ HOME\fP, \fBSHIFT\ HOME\fP, \fBCTRL\ K\fP@First word

\fB\(->\fP, \fBl\fP@Next word
\fBCTRL\ \(->\fP, \fBL\fP@End of line
\fB\(da\fP, \fBj\fP@Next line
\fBPgDn\fP, \fBJ\fP@Next page
\fBEND\fP@Last word of the window
\fBCTRL\ END\fP, \fBSHIFT\ END\fP, \fBCTRL\ J\fP@Last word
.TE

\fBCTRL\ \(<-\fP/\fBH\fP (resp. \fBCTRL\ \(->\fP/\fBL\fP) places the cursor
so that a maximum number of words (selectable or not) are visible to
the left (reps. right) side of the window.

If \fB-N\fP|\fB-number\fP, \fB-U\fP|\fB-unnumber\fP or
\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP are used, then it becomes
possible to directly access a word by entering its number.
The numbering created using these option is done \fBbefore\fP any words
substitution done using \fB-S\fP|\fB-subst\fP \fI/regex/repl/opts\fP,
\fB-I\fP|\fB-si\fP|\fB-subst_included\fP or
\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP.

Using a combination of these options, it is easy to control which words
will be numbered by adding a special symbol in it before using smenu and
removing it (substituted by nothing) afterward using
\fB-I\fP|\fB-si\fP|\fB-subst_included\fP by example.

\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP gives another way to do that,
see below or more.
.SS "Searching for words"
A word can be searched using different algorithms: \fIprefix\fP,
\fIsubstring\fP of \fIfuzzy\fP.
.TP
\fIprefix\fP (keys \fB^\fP or \fB=\fP):
The sequence of characters entered must match the beginning of a word.
.TP
\fIsubstring\fP (keys \fB"\fP or \fB'\fP):
The sequence of characters entered must match a substring in a word.
.TP
\fIfuzzy\fP (keys \fB~\fP or \fB*\fP):
All the characters in the entered sequence must appear in the same order
in a word, but need not be consecutive.

The case is also ignored.

Note that spaces and tabs at the beginning and end of words are ignored
when searching for substrings or fuzzy strings.

The cursor is placed, if possible, on the first matching word having the
minimum number of gaps between the first and last matching character,
see the difference between the actions of the \fBs\fP/\fBS\fP and
\fBn\fP/\fBN\fP keys below.

This method also tolerates intermediate symbols not appearing in the
words which will be ignored.
If this is the case, the attributes of the approximatively matching
words are changed into an error versions of them to warn the user to
this situation.

The erroneous symbols will \fInot\fP be inserted in the search buffer.

For example: if the word \fBabcdef\fP is present in the standard input,
then entering \f(CBabxcdye\fP puts \fBabcdef\fP in the search buffer
and the word is added to the list of matching words and displayed with
an error attribute (in red by default).

This special state will persist until all the symbols following the first
erroneous one are deleted (using backspace) or if \fBESC\fP is pressed
to cancel the search session and clear the search buffer.
.PP
During a search session, the cursor changes and each character entered is
added in (or removed from) the search buffer.
The display is refreshed after each change in this buffer.
.PP
A 10 seconds timeout (by default) automatically ends the current
search session as if the \fBEnter\fP key had been pressed.
This timeout is reset each time a new key is hit in search mode.
This delay can be configured using the \fBsearch\fP entry in the
\fBtimers\fP section of the configuration file as shown in the example
in the configuration subsection.
.PP
The slash key (\fB/\fP) can also be used instead of any of these keys.
By default it is is programmed to do a \fIfuzzy\fP search but this can
be changed by using the command line option
(\fB-/\fP|\fB-search_method\fP) or by tuning a configuration file,
see below.
.PP
All the words matching the current search buffer are enhanced:
The characters present in the current search buffer are highlighted in
one way and the other characters in another way.
Both of these highlighting methods are configurable.
.PP
If the user has entered the search sequence: \fBo\fP, \fBs\fP, then the
matching word "words" will be displayed as \fBw\fP\fIo\fP\fBrd\fP\fIs\fP
when the \fIfuzzy\fP algorithm is in use depending of the display
attributes configured.
.PP
\fBENTER\fP and all cursor moves terminate the search session but do
not clear the list of the matching words and the search buffer.
.PP
The user can then use the \fBn\fP/\fBs\fP/\fBSPACE\fP keys (forward) and
the \fBN\fP/\fBS\fP keys (backward) to navigate in the list of matching
words,

In \fIfuzzy\fP search mode, the \fBs\fP/\fBS\fP keys attempt to move the
cursor to the next/previous word whose matching part forms a substring
of this word.
If no such matches exist, \fBs\fP/\fBS\fP and \fBn\fP/\fBN\fP do the
same things.
To move the cursor to the next/previous fuzzy match, use the
\fBn\fP/\fBN\fP/\fBSPACE\fP keys.
\fBs\fP means next \fPs\fPubstring match in this context while \fBn\fP
just means \fBn\fPext match.
.PP
If the user hits the \fBHOME\fP or \fBEND\fP key during a search session
then the list of matching words is reduced to the words starting
(respectively) ending with the current search pattern and the window
is refreshed.
For those who consider \fBHOME\fP and \fBEND\fP as non-intuitive,
the \fBCTRL\ A\fP and \fBCTRL\ Z\fP keys are also available in search mode
as an alternative.
This behaviour is persistent until the user hit the \fBESC\fP or
\fBENTER\fP key.

For example, if the search pattern in substring mode is \f(CBsh\fP and
the user hits \fBEND\fP, then only the words \fIending\fP with \f(CBsh\fP
will be added in the searched word list and enhanced.

Note that when a matching word is selected, its enhanced characters only
show one of the multiple matching possibilities.

When not in a search session \fBESC\fP can be also used to clear the
list of matching words and to reset the search buffer.
.PP
In summary, here is the meaning of the special keys in search mode:
.TS
tab(@);
lb s s
l l c
^ ^ l
l lw(6c) c .
Keys which clear the list of matching words.
Key@Meaning@Closes
@@the
@@search
@@session
_
Esc@Cancel search@Yes
_

.T&
lb s s
l l l
^ ^ l
l lw(6c) c .
Keys which keep or update the list of matching words.
Key@Meaning@Closes
@@the
@@search
@@session
_
\fB\(<-\fP@Previous word@Yes
\fB\(ua\fP@Previous line@Yes
\fBCTRL\ \(<-\fP@Start of line@Yes
\fBPgUp\fP@Previous page@Yes
\fBCTRL\ HOME\fP, \fBSHIFT\ HOME\fP, \fBCTRL\ K\fP@First word@Yes

\fB\(->\fP@Next word@Yes
\fB\(da\fP@Next line@Yes
\fBCTRL\ \(->\fP@END of line@Yes
\fBPgDn\fP@Next pages@Yes
\fBCTRL\ END\fP, \fBSHIFT\ END\fP, \fBCTRL\ J\fP@Last word@Yes

\fBHOME\fP, \fBCTRL\ A\fP@T{
Only keep the words starting with the search pattern
T}@No
\fBEND\fP, \fBCTRL\ Z\fP@T{
Only keep the words ending with the search pattern
T}@No

\fBINS\fP@Tag word@No
\fBDEL\fP@Untag word@No
_
.TE
.PP
Note that the search buffer is persistent as long as the same search
algorithm is used and \fBESC\fP has not been pressed.
.SS "Selection and Exit"
Pressing \fBq\fP gives the possibility to exit without selecting anything.
.PP
\fBCTRL\ C\fP (Abort) also allows you to exit the program
immediately with a return code equal to 128+SINGINT (by default)
without selecting anything.
See the \fB-!\fP|\fB-int\fP|\fB-int_string\fP option for more information
about the customization of the \fBCTRL\ C\fP behaviour.
.PP
By default, \fBENTER\fP writes the selected word to stdout when not in
search mode otherwise it exits from this mode and does nothing more.
If you want to be able to select a word \fIeven\fP when in search mode,
use the \fB-r\fP|\fB-auto_validate\fP option to change this behavior.
.SS "Tagging (multiple selections)"
When the tagging is activated by using the command line
\fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP
or \fB-P\fP|\fB-pm\fP|\fB-pin\fP|\fB-pin_mode\fP option, then the
keys \fBt\fP, \fBT\fP, \fBINS\fP and \fBDEL\fP can be used to tag/untag
some words.
These tagged words will then be output on the standard output when
\fBENTER\fP is pressed.
.TP
\fBt\fP
Tag/untag or Pin/unpin the word under the cursor (toggle).
.TP
\fBT\fP
Tag or pin the matching words if any.
.TP
\fBU\fP
Untag or unpin the matching words if any.
.TP
\fBINS\fP
Tag or pin the word under the cursor.
.TP
\fBDEL\fP
Untag or unpin the word under the cursor.
.SS Help
A small help message can be displayed when hitting \fB?\fP.
This display will last for 10s or until a valid key or \fBESC\fP is
pressed.
.SS Scroll bar
A scroll bar is displayed at the right of the scrolling window.
Its appearance is meant to be classical but it has some particularities:
.IP * 2
The scroll bar is not displayed if all the input words fit on only one
line.
.IP * 2
Otherwise, the scroll bar is always displayed except when the \fB-q\fP
option is set.
This option completely disables the scroll bar display.
.IP * 2
When the scrolling window has only one line, the scroll bar has only 3
states:
.RS 2
.IP - 2
\fBv\fP when on all but the last line, indicating that you can go down
to see more.
.IP - 2
\fB^\fP when on the last line.
.IP - 2
\fB|\fP otherwise.
.RE
.IP * 2
When there is more than one line to display, \fB/\fP means that the window
displays the first line, \fB\\\fP the last line.
\fB|\fP is used to fill the gap, see below the different possible
configurations.
.TS
tab(@);
l l l l l
l l l l l
l l l l .
\\@\\@^@^@\\ @Do not remove this trailing space!
|@|@|@|@/
/@v@/@v
.TE
.PP
A \fB+\fP can also appear in the scroll bar in lieu of the vertical bar,
giving the relative position of the cursor line in the bunch of input
words.
.SS "Terminal resizing (also see BUGS/LIMITATIONS)"
The windows is redrawn if the terminal is resized.
The redrawing is actually done only 1s after the end of the resizing to
avoid artefacts on screen.
The cursor will remain on the current selected word but may be displayed
at another place in the window.
.SS Unicode support
This utility is Unicode aware and should be able to display correctly
any Unicode character (even double-width ones) as long as the current
encoding is \fBUTF-8\fP (\fBUTF-8\fP in the output of the \fIlocale\fP
command).
.SS Configuration
If a file with adequate permissions and the same name as the executable
but prefixed with a dot is present in the current directory
or in the user's home directory, then it will be parsed as a
\fIini\fP file.
The values read from the file in the home directory will be overridden by
the ones read from the local directory (if it is present).

Missing and bad keywords are silently skipped.

The values read, if valid, override the default hard-coded ones.

If a value is invalid an error message is shown and the program terminates.

The values of the timers must be given in units of \fB1/10\fP of a second.

Here is an example giving the syntax and the names of the keywords
allowed:
.PP
.nf
\f(CR--8<------------------------------------------------------------------
[colors]
  ; The terminal must have at least 8 colors and/or have attributes like bold
  ; and reverse for this to be useful
  ; if not the following settings will be ignored.

  method=ansi             ; classic | ansi (default)

  cursor=0/2              ; cursor attributes
  cursor_on_tag=0/2,u     ; cursor on tag attributes
  shift=6,b               ; shift symbol attributes
  message=0/3             ; message (title) attributes
  bar = 7/4,b             ; scroll bar attributes
  search_field = 0/6      ; search field attributes
  search_text = 7,bu      ; search text attributes
  match_field = 1,b       ; matching words field attributes
  match_text = 7,bu       ; matching words text attributes
  search_err_field = 1    ; approximate search field attributes
  search_err_text = 1,r   ; approximate search text attributes
  ; match_err_field = 3   ; approximate matching words field attributes
  match_err_text = 1      ; approximate matching words text attributes
  ; include = b           ; selectable color attributes
  exclude = 4/0,u         ; non-selectable color attributes
  tag = 0/5               ; tagged (selected) attributes
  daccess = 3,b           ; direct access tag attributes

  special1 = 7/4,b        ; attributes for the special level 1
  special2 = bu           ; attributes for the special level 2
  special3 = /3,b         ; attributes for the special level 3
  special4 = 7/4          ; attributes for the special level 4
  special5 = 7/2,b        ; attributes for the special level 5

[window]
  lines = 7               ; default number of lines of the window

[limits]
  word_length = 1024      ; arbitrary max length of input words (int)
  words = 32767           ; arbitrary max number of allowed input
                          ; words (int)
  columns = 128           ; arbitrary max number of columns (int)

[timers]
  search = 100            ; search timeout in 1/10 s
  help = 150              ; duration of the help message in 1/10 s
  window = 7              ; delay before redrawing if the size of the
                          ; terminal's window change in 1/10 s
  direct_access = 6       ; duration allowed to add a new digit to
                          ; the direct word access number in 1/10 s

[misc]
  default_search_method = substring
--8<------------------------------------------------------------------
\fP
.fi
.IP * 2
The \fBmethod\fP keyword can take the two possible values displayed
above and determines if you want to use the native method (limited to 8
colors) of the \fBansi\fP method (ISO 8613-6) if your terminal supports
more than 8 colors.

The default value corresponds to \fBansi\fP.

The attributes syntax is [fg][/bg][,toggles] where \fBfg\fP and
\fBbg\fP are numbers representing the foreground and background
color and \fBtoggles\fP is a strings which can contain the characters
\fIb\fP, \fId\fP, \fIr\fP, \fIs\fP, \fIu\fP and \fIi\fP  standing for
\fIb\fPold, \fId\fPim, \fIr\fPeverse, \fIs\fPtandout, \fIu\fPnderline
and \fIi\fPtalic.
.IP * 2
Spaces are allowed anywhere in the lines and between them, even around
the \fB=\fP.
.IP * 2
Everything following a \fB;\fP is ignored.
.IP * 2
When undefined, the default limits are:
.TS
tab(@);
l l .
words@32767
word_length@512
columns@256
.TE
.SH OPTIONS

Not all options may be available, depending on the current context.

When smenu is called and before the first option is evaluated, it is in
the \fBMain\fP context.
Each option can switch to another context in which only a subset of the
options is usable.

For each parameter described below, the contexts in which the associated
option is defined as well as the context to which it leads, if any,
are given.

An option not defined in a context will force the end of the current
context and will be recursively evaluated in the previous contexts until
found (or not).
If not found, an error message is displayed and smenu is terminated.

The contexts defined in smenu are:
.IP \fBMain\fP 2
The default context
.IP \fBColumns\fP 2
After the \fB-c\fP|\fB-col\fP|\fB-col_mode\fP|\fB-column\fP parameter.
.IP \fBLines\fP 2
After the \fB-l\fP|\fB-line\fP|\fB-line_mode\fP parameter.
.IP \fBTabulations 2
After the \fB-t\fP|\fB-tab\fP|\fB-tab_mode\fP|\fB-tabulate_mode\fP parameter.
.IP \fBTagging\fP 2
After the \fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP or
\fB-P\fP|\fB-pm\fP|\fB-pin\fP|\fB-pin_mode\fP parameter.
.PP
.IP \fBWARNING\fP 2
Here is a situation that may seem confusing at first glance.

Imagine the only parameter command line parameter is \fB-cols_select\fP.

Since this is a parameter of an option which is not valid when not in
the \fBColumns\fP context, it should have raised an error but it still
seems to be accepted.

The trick is: when not in column mode \fB-cols_select\fP is indeed not
accepted but its prefix (\fB-col\fP) is valid.
The options are thus understood as: \fB-col\fP \fB-s_select\fP.
The same mechanism occurs again as \fB-s\fP is also valid in column
mode so the final understanding of the command line is: \fB-col\fP
\fB-s\fP \fB_select\fP.

In such a case, the user can set the environment variable
\fBCTXOPT_DEBUG\fP which any non-empty content.
When run again the following output will appear on the standard error:
.PP
.nf
CTXOPT_DEBUG: Parameter: -cols_select. Evaluation context: Main.
CTXOPT_DEBUG: Found a valid parameter as a prefix of -cols_select: -col.
CTXOPT_DEBUG: Parameter: -col. Evaluation context: Main.
CTXOPT_DEBUG: Switch to context Columns.
CTXOPT_DEBUG: Parameter: -s_select. Evaluation context: Columns.
CTXOPT_DEBUG: Found a valid parameter as a prefix of -s_select: -s.
CTXOPT_DEBUG: Parameter: -s. Evaluation context: Columns.
CTXOPT_DEBUG: Argument: _select.
.fi
.PP
The command line: \fB-col\fP \fB-cols_select\fP \fB1\fP solves the
issue in this case and indicates that only the first column should be
selectable.
Note, however, that at least one argument for \fB-cols_select\fP is
now required:
.PP
.nf
CTXOPT_DEBUG: Parameter: -col. Evaluation context: Main.
CTXOPT_DEBUG: Switch to context Columns.
CTXOPT_DEBUG: Parameter: -cols_select. Evaluation context: Columns.
CTXOPT_DEBUG: Argument: 1.
.fi
.PP
The \fB-h\fP|\fB-help\fP and \fB-?\fP|\fB-u\fP|\fB-usage\fP options now
display the help and synopsis of the available options in the current
context.
.IP Example: 2
\f(CBsmenu -col -u\fP will only show the usage in the \fBColumns\fP
context
.PP
The contexts contain all the non-context-changing options so, in practice,
the usage should be intuitive.
You may nevertheless have to adjust some scripts using the old smenu
releases as I did in the lvm_menu example.
.PP
Some of the advantages of this new system of options are:
.IP * 2
Long parameter names are allowed
One dash is enough, but two are also allowed for compatibility reasons.
.IP * 2
An option can be referenced by any number of parameters with short or
long names.
.IP * 2
Auto checking of missing mandatory options, duplicated option,...
.IP * 2
Only options usable in the current context are allowed.
.PP
This option management system is explained in more detail at
https://github.com/p-gen/ctxopt.
.PP
The description of each command line parameter is as follows:
.IP "\fB-h\fP|\fB-help\fP"
(Allowed in all contexts.)

Display a context specific help messages and exits.
.IP "\fB-H\fP|\fB-long_help\fP"
(Allowed in the "Main" context.)

Display a long (non context specific) help messages and exits.
.IP "\fB-?\fP|\fB-u\fP|\fB-usage\fP"
(Allowed in all contexts.)

Displays a short help message and exits.
.IP "\fB-V\fP|\fB-version\fP"
(Allowed in the "Main" context.)

The \fB.smenu\fP files in the user's home directory and in the current
directory, if present, will be ignored when this option is used.
.IP "\fB-n\fP|\fB-lines\fP|\fB-height\fP [\fIheight\fP]"
(Allowed in all contexts.)

Gives the maximum number of lines in the scrolling selection window.

If \fB-n\fP|\fB-lines\fP|\fB-height\fP is not present the number of
lines will be set to \fI5\fP.

If \fB-n\fP|\fB-lines\fP|\fB-height\fP is present without argument, then
the height of the terminal will be used to determine the number of lines.
This remains true even if the terminal is resized.

If \fB-n\fP|\fB-lines\fP|\fB-height\fP is present with a numerical
argument, this value will be used to determine the number of lines.
.IP "\fB-i\fP|\fB-in\fP|\fB-inc\fP|\fB-incl\fP|\fB-include\fP... \fIregex\fP"
(Allowed in all contexts.)

Sets the \fBi\fPnclude filter to match the selectable words.
All the other words will become implicitly non-selectable (excluded)

\fB-i\fP|\fB-in\fP|\fB-inc\fP|\fB-incl\fP|\fB-include\fP can be used more
than once with cumulative effect.

\fI\\u\fP and \fI\\U\fP sequences can also be used in the regexp.
.IP "\fB-e\fP|\fB-ex\fP|\fB-exc\fP|\fB-excl\fP|\fB-exclude\fP... \fIregex\fP"
(Allowed in all contexts.)

Sets the \fBe\fPxclude filter to match the non-selectable words.
All the other selectable words will become implicitly selectable (included)

\fB-e\fP|\fB-ex\fP|\fB-exc\fP|\fB-excl\fP|\fB-exclude\fP can be used more
than once with cumulative effect.
This filter has a higher priority than the include filter.

The \fIregex\fP selections made using
\fB-i\fP|\fB-in\fP|\fB-inc\fP|\fB-incl\fP|\fB-include\fP and/or
\fB-e\fP|\fB-ex\fP|\fB-exc\fP|\fB-excl\fP|\fB-exclude\fP are done before
the possible words alterations made
by \fB-I\fP|\fB-si\fP|\fB-subst_included\fP or
\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP (see below).

\fI\\u\fP and \fI\\U\fP sequences can also be used in the regexp.
.IP "\fB-m\fP|\fB-msg\fP|\fB-message\fP|\fB-title\fP \fImessage\fP"
(Allowed in all contexts.)

Displays a message (title) above the window.
If the current locale is not \fIUTF-8\fP, then all \fIUTF-8\fP characters
will be replaced by the substitution character.

\fI\\u\fP and \fI\\U\fP sequences can be used in the message.

Note that the message will be truncated if it does not fit on a terminal
line.
.IP "\fB-!\fP|\fB-int\fP|\fB-int_string\fP [\fIstring\fP]"
(Allowed in all contexts.)

The optional \fIstring\fP argument, when present,
defines the string to be used as the selection string when
the \fBCTRL\ C\fP sequence is entered.

If \fIstring\fP is missing then nothing will be selected.

In all cases, when \fB-!\fP|\fB-int\fP|\fB-int_string\fP is present in
the command line, the return code of the program will be \fB0\fP.

This gives the user the choice to make the behaviour of \fBCTRL\ C\fP
similar to that of \fBq\fP and \fBQ\fP or to that of the Unix shell
leaving the shell with a return code greater than 128.
.IP "\fB-a\fP|\fB-attr\fP|\fB-attributes\fP \fIprefix:attr\fP..."
(Allowed in all contexts.)

Sets the display attributes of the elements displayed and the cursor.

At least one attribute prefixed attribute must be given.

\fIprefix\fP can take the following values:
.RS
.IP \fIi\fP
included words.
.IP \fIe\fP
excluded words.
.IP \fIc\fP
cursor.
.IP \fIb\fP
scroll bar.
.IP \fIs\fP
shift indicator.
.IP \fIm\fP
message (title).
.IP \fIt\fP
tagged words.
.IP \fIct\fP
cursor on tagged words.
.IP \fIsf\fP
search field.
.IP \fIst\fP
search text.
.IP \fIsfe\fP
approximate search field with error.
.IP \fIste\fP
approximate search text with error.
.IP \fImf\fP
matching words field.
.IP \fImt\fP
matching words text.
.IP \fImfe\fP
matching words field with error.
.IP \fImte\fP
matching words text with error.
.IP \fIda\fP
direct access tag.
.RE
.IP
If more than one attribute is given, they must be separated by spaces.

Example: \f(CB-attr i:/5 e:4,br b:7/3,rb c:7/2,b\fP

See the the \fB-1\fP|\fB-l1\fP|\fB-level1\fP option below for the
description of the attributes syntax after the colon and an example.
.IP "\fB-1\fP|\fB-l1\fP|\fB-level1\fP \fIregex\fP [\fIattr\fP]"
.IP "\fB-2\fP|\fB-l2\fP|\fB-level2\fP \fIregex\fP [\fIattr\fP]"
.IP "\fB-3\fP|\fB-l3\fP|\fB-level3\fP \fIregex\fP [\fIattr\fP]"
.IP "\fB-4\fP|\fB-l4\fP|\fB-level4\fP \fIregex\fP [\fIattr\fP]"
.IP "\fB-5\fP|\fB-l5\fP|\fB-level5\fP \fIregex\fP [\fIattr\fP]"
(Allowed in all contexts.)

Allows one to give a special display color to up to 5 classes of words
specified by regular expressions.
They are called \fBspecial levels\fP.
Only selectable words will be considered.

By default, the 5 special levels have their foreground color set to
red, green, brown/yellow, purple and cyan.
All these colors also can be set or modified permanently in the
configuration files.
See the example file above for an example.

The optional second argument (\fIattr\fP) can be used to override the
default or configured attributes of each class.
Its syntax is the same as the one used in the configuration file:
.nf
[\fIfg\fP][/\fIbg\fP][,{\fIb\fP|\fId\fP|\fIr\fP|\fIs\fP|\fIu\fP|\fIi\fP}] \
| [{\fIb\fP|\fId\fP|\fIr\fP|\fIs\fP|\fIu\fP|\fIi\fP}]
.fi

Examples of possible attributes are:
.nf
  \f(CB2/0,bu \fPgreen on black bold underline
  \f(CB/2     \fPgreen background
  \f(CB5      \fPtext in purple
  \f(CBrb     \fPreverse bold
.fi

\fI\\u\fP and \fI\\U\fP sequences can be used in the pattern.
.IP "\fB-z\fP|\fB-zap\fP|\fB-zap_glyphs\fP \fIbytes\fP"
(Allowed in all contexts.)

Initializes a set of UTF-8 characters to be ignored when reading words from
stdin or a file.

Example: The argument \f(CR'\\u0d\\ue282ac,'\fP means: ignore all commas,
Euro signs and carriage return characters when reading from stdin or
a file.

As shown above \fI\\u\fP and \fI\\U\fP sequences can be used in the
bytes set.
.IP "\fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP [\fIdelim\fP]"
(Allowed in the following contexts: "Main", "Columns", "Lines", and
"Tabulations", switches to the "Tagging" context.)

Enables multiple selections or tag mode.
In this mode, several selectable words can be selected without leaving
the program.

The current word can be automatically tagged when the \fBENTER\fP key
is pressed to complete the selection process if the
\fB-p\fP|\fB-at\fP|\fB-auto_tag\fP option is
also set or if no word has been tagged.

All the tagged words (and possibly the world under the cursor) will
be sent to stdout separated by the optional argument given after the
option \fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP.

Note than this \fIseparator\fP can have more than one character, contain
UTF-8 characters (in native or \fI\\u\fP or \fI\\U\fP form) and can even
contain control character as in \f(CB$'\\n'\fP.

A space is used as the default separator if none is given.

\fBCaution\fP: To get exactly the same behavior as in version 0.9.11
and earlier, you must also use the \fB-p\fP|\fB-at\fP|\fB-auto_tag\fP
option.
.IP "\fB-P\fP|\fB-pm\fP|\fB-pin\fP|\fB-pin_mode\fP [\fIdelim\fP]"
(Allowed in the following contexts: "Main", "Columns", "Lines", and
"Tabulations", switches to the "Tagging" context.)

Works like \fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP but, unlike
\fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP, the output depends on
the order in which the words were tagged.
In other words, the first tagged word comes first in the output, the
second tagged word comes next, and so on.
.IP "\fB-p\fP|\fB-at\fP|\fB-auto_tag\fP"
(Allowed in the "Tagging" context.)

This option modifies the default behavior of the
\fB-T\fP|\fB-tm\fP|\fB-tag\fP|\fB-tag_mode\fP
and \fB-P\fP|\fB-pm\fP|\fB-pin\fP|\fB-pin_mode\fP options.
An untagged word under the cursor will be automatically tagged when
\fBENTER\fP is pressed.
.IP "\fB-N\fP|\fB-number\fP>da_ctx... [\fIregex\fP]"
(Allowed in the following contexts: "Main", "Columns", "Lines" and
"Tabulation".)

This option allows you to number selectable words that match a specific
regular expression.
These numbers are numbered from 1 and allow direct access to the words.

To use this functionality, the user must enter the number which
corresponds to the desired entry digit per digit.

Each new digit must be added in a time frame of 1/2 seconds (per default)
otherwise the number is considered complete and a newly entered digit
will start a new number.
If the number does not exists, then the cursor is restored to it's
initial position.

The sub-options of the \fB-D\fP|\fB-data\fP|\fB-options\fP option
described below can change the way \fB-N\fP|\fB-number\fP sets and
formats the numbers.

This option accepts more than one argument and can be used multiple
times with cumulative effects.

\fB-N\fP|\fB-number\fP, \fB-U\fP|\fB-unnumber\fP and
\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP can be mixed.
.IP "\fB-U\fP|\fB-unnumber\fP>da_ctx... [\fIregex\fP]"
(Allowed in the following contexts: "Main", "Columns", "Lines" and
"Tabulation".)

This option allows one to unnumber words.
If placed after a previous \fB-N\fP|\fB-number\fP, it can be used to
remove the numbering of selected words.
If placed before, the word which doesn't match its regular expression
will be numbered by default.

This mechanism is similar to to the inclusion/exclusion of words by
\fB-i\fP|\fB-in\fP|\fB-inc\fP|\fB-incl\fP|\fB-include\fP and
\fB-e\fP|\fB-ex\fP|\fB-exc\fP|\fB-excl\fP|\fB-exclude\fP.

This option accepts more than one argument and can be used multiple
times with cumulative effects.

\fB-U\fP|\fB-unnumber\fP, \fB-N\fP|\fB-number\fP and
\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP can be mixed.
.IP "\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP"
(Allowed in the following contexts: "Main", "Columns", "Lines" and
"Tabulation".)

This option is similar to \fB-N\fP|\fB-number\fP but does not generate
a continuous flow of numbers but extracts them from the word itself.

With this option you can take full control of the numbering of the
displayed word.
Note that the numbering does not need to be ordered.

The resulting word after the extraction of the number must be non empty.

Some sub-option are required, see the \fB-D\fP|\fB-data\fP|\fB-options\fP
option described below.

\fBNotice\fP that for this option to work correctly, all the embedded
numbers must have the same number of digits.
To get that, a preprocessing may be necessary on the words before using
this program.

\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \fB-N\fP|\fB-number\fP and
\fB-U\fP|\fB-unnumber\fP can be mixed.
.IP "\fB-D\fP|\fB-data\fP|\fB-options\fP [\fIparameter\fP...]"
(Allowed in the Following contexts: "Main", "Columns", "Lines" and
"Tabulations".)

This option allows one to change the default behaviour of
the \fB-N\fP|\fB-number\fP, \fB-U\fP|\fB-unnumber\fP and
\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP options.

Its optional parameters are called sub-options and must respect the
format \fBx\fP:\fBy\fP where \fBx\fP can be:
.RS
.TP
\f(CBl\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is the UTF-8 character (in native or \fI\\u\fP or \fI\\U\fP
form) to print before the number.
The default is a single space.
.
.TP
\f(CBr\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is the UTF-8 character (in native or \fI\\u\fP or \fI\\U\fP
form) to print after the number.
The default is \f(CB)\fP.
.
.TP
\f(CBa\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is '\f(CBleft\fP' (or one of its prefixes) if the number
must be \fIleft\fP aligned, or '\f(CBright\fP' (or one of its prefixes)
if it must be \fIright\fP aligned.
The default is \f(CBright\fP.
.
.TP
\f(CBp\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is '\f(CBincluded\fP' or '\f(CBall\fP' for the initial
\fIp\fPadding of the non numbered words.
The keyword '\f(CBincluded\fP' means that only \fIincluded\fP word will
be padded while '\f(CBall\fP' means pad \fIall\fP words.

The default is \f(CBall\fP. These keywords can be abbreviated.
.
.TP
\f(CBw\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is the \fIw\fPidth of the number between 1 and 5 included.
.
.TP
\f(CBf\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP controls if the numbering must \fIf\fPollow the last
extracted number (defaults to \f(CByes\fP) or if it must remain
independent.

The possible values are \f(CByes\fP and \f(CBno\fP but can be abbreviated.
.
.TP
\f(CBm\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP option)
Here \fBy\fP controls if the numbering of word with missing embedded numbers
must be done or not (defaults to \f(CByes\fP).

When this sub-option is set to \f(CBno\fP, the \f(CBs\fP and \f(CBf\fP
sub-options are ignored.

The possible values are \f(CByes\fP and \f(CBno\fP but can be abbreviated.
.
.TP
\f(CBh\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP option)
Tells what to do with the characters present before the embedded number if
any.

The allowed directives are: '\f(CBtrim\fP' which discads them if they
form an empty word (only made of spaces and tabulations), '\f(CBcut\fP'
which unconditionally discards them and '\f(CBkeep\fP' which places them
at the beginning of the resulting word.

The default value for this directive is '\f(CBkeep\fP', these keywords
can be abbeviated.
.
.TP
\f(CBo\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP option)
Here \fBy\fP is the \fIo\fPffset of the first multibyte character of
the number to extract from the word (defaults to \f(CB0\fP).

If this offset if immediately followed by the character '\f(CB+\fP',
then the parser will look for the first number (if any) after the given
offset instead of using its absolute value to extract the number.

Note that when the '\f(CB+\fP' is used, it is necessary that the length
of all the numbers to extract have the same size as the algorithm looks
for a digit to identify the beginning of the number to extract.
Hence, for example, \fB1\fP should appear as \fB01\fP in the input is
\f(CBn\fP is set to \f(CB2\fP.
.
.TP
\f(CBn\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP option)
Here \fBy\fP is the \fIn\fPumber of multibyte characters to extract
from the word starting at the offset given by the \f(CBo\fP sub-option.

Example: \f(CRn:2\fP will extract and use the first 2 digits of each
words from the input stream to number them.

.TP
\f(CBi\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP option)
Here \fBy\fP is number of multibyte characters to \fIi\fPgnore after
the extracted number
.
.TP
\f(CBd\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is a multibyte separator.
When present, this directive instructs smenu to output the selected
numbered word(s) \fIprefixed\fP by its(their) direct access number(s)
and the given separator.

Only the numbered word(s) will be prefixed.

\f(CBd\fP stands for \fBd\fPecorate.

This directive can be useful when you want to post-process the output
according to its direct access number.
.
.TP
\f(CBs\fP (\fB-F\fP|\fB-en\fP|\fB-embedded_number\fP, \
\fB-N\fP|\fB-number\fP and \fB-U\fP|\fB-unnumber\fP options)
Here \fBy\fP is the direct access number that will be set for the first
numbered word.
Its value is \fB1\fP by default, a value of \fB0\fP is possible.
.P
Example: \f(CR-data r:\\> l:\\< a:l d:_ \fP

To number all words with the default parameters, use the
syntax: "\f(CR-N .\fP" which is a shortcut for:
"\f(CR-N . -D l:' ' r:')' a:r p:a\fP"

The \fIpadding\fP sub-option specifies whether spaces must also be
added in front of excluded words or not to improve compactness.

When the \f(CBw\fP sub-option is not given the width of the numbers is
determined automatically but if \fB-F\fP|\fB-en\fP|\fB-embedded_number\fP
is set and the value of the \f(CBn\fP sub-option is given then this
value is used.
.RE
.IP "\fB-b\fP|\fB-blank\fP"
(Allowed in all contexts.)

Replaces all non-printable characters by a blank.
If this results in a blank word, it will be potentially deleted.
.IP "\fB-.\fP|\fB-dot\fP|\fB-invalid\fP"
(Allowed in all contexts.)

Sets the substitution character for non-printable characters.
When this parameter is not used, the default substitution character is
a single dot.
.IP "\fB-M\fP|\fB-middle\fP|\fB-center\fP"
(Allowed in all contexts.)

Centers the display if possible.
.IP "\fB-d\fP|\fB-restore\fP|\fB-delete\fP|\fB-clean\fP|\fB-delete_window\fP|\
\fB-clean_window\fP"
(Allowed in all contexts.)

Tells the program to clean up the display before quitting by removing
the selection window after use as if it was never displayed.
.IP "\fB-c\fP|\fB-col\fP|\fB-col_mode\fP|\fB-column\fP"
(Allowed in the "Main" and "Tagging" contexts, switches to the "Columns"
context.)

Sets the column mode.
In this mode the lines of words do not wrap when the right border of
the terminal is reached but only when a special character is read.
Some words will not be displayed without an horizontal scrolling.

If such a scrolling is needed, some indications may appear on the left
and right edge of the window to help the user to reach the unseen words.

In this mode, the width of each column is minimal to keep the maximum
information visible on the terminal.
.IP "\fB-l\fP|\fB-line\fP|\fB-line_mode\fP"
(Allowed in the "Main" and "Tagging" contexts, switches to the "Lines"
context.)

Sets the line mode.
This mode is the same as column mode but without any column alignment.
.IP "\fB-t\fP|\fB-tab\fP|\fB-tab_mode\fP|\fB-tabulate_mode\fP [\fIcols\fP]"
(Allowed in the "Main" and "Tagging" contexts, switches to the
"Tabulations" context.)

This option sets the tabulation mode and, if a number is specified,
attempts to set the number of displayed columns to that number.

In this mode, embedded line separators are ignored if not explicitly set
with \fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\fB-line_separators\fP.
The options \fB-A\fP|\fB-fc\fP|\fB-first_column\fP and
\fB-Z\fP|\fB-lc\fP|\fB-last_column\fP can nevertheless be used to
force words to appear in the first (respectively last) position of the
displayed line.
.PP
.RS
Note that the number of requested columns will be automatically reduced
if a word does not fit in the calculated column size.
.PP
In this mode each column has the same width.
.RE
.IP "\fB-w\fP|\fB-wide\fP|\fB-wide_mode\fP"
(Allowed in the "Columns" and "Tabulations" contexts.)

When \fB-t\fP|\fB-tab\fP|\fB-tab_mode\fP|\fB-tabulate_mode\fP is followed by a
number of columns, the default is to compact the columns so that they
use the less terminal width as possible.
This option enlarges the columns in order to use the whole terminal width.

When in column mode, \fB-w\fP|\fB-wide\fP|\fB-wide_mode\fP can be used
to force all the columns to have the same size (the largest one).
See option \fB-c\fP|\fB-col\fP|\fB-col_mode\fP|\fB-column\fP below.
.PP
.RS
Note that the column's size is only calculated once when the words are
displayed for the first time.
A terminal resize will not update this value.
This choice enables a faster display.
.RE
.PP
.IP "\fB-C\fP|\fB-cs\fP|\fB-cols\fP|\fB-cols_select\fP... \
[\fIi\fP|\fIe\fP]\fIselectors\fP..."
(Allowed in the "Columns" context.)

\fII\fP and \fIE\fP have the same meaning as \fIi\fP and \fIe\fP.

In column mode, this option is useful to restrict the selections to a
subset of all columns.
Either by including (nothing or \fIi\fP) or by excluding (\fIe\fP) them.

Columns can be designated by their number (1 based) or by a regular
expression enclosed in delimiter made from any non-blank ASCII character
excluding the comma.

Range of columns (number or RE) can be given by separated then with
a dash.

Multiple selectors can be regrouped in one argument using commas to
separate them.
This option also accepts multiple arguments, each of them being a
selector.

A selection by regular expressions means that a column containing a word
matching any of these expressions will be included or excluded depending
on the letter given after the option or before the selector if there is
more than one argument.

Regular expressions and column numbers can be freely mixed.

Regular expression in \fB-C\fP|\fB-cs\fP|\fB-cols\fP|\fB-cols_select\fP and
\fB-R\fP|\fB-rs\fP|\fB-rows\fP|\fB-rows_select\fP can contain \fIUTF-8\fP
characters either directly or by using the \fI\\u\fP or \fI\\U\fP notation.

Example of columns selection: \f(CB-Ci2,3,/X./,5-7\fP forces the cursor
to only navigate in columns \fB2\fP,\fB3\fP,\fB5\fP,\fB6\fP and \fB7\fP
and those containing a two characters word starting with '\fBX\fP'.
If \fIe\fP was used in place of \fIi\fP, all the columns would have been
selected \fBexcept\fP the columns \fB2\fP,\fB3\fP,\fB5\fP,\fB6\fP,\fB7\fP
and those matching the extended regular expression '\f(CBX.\fP'.

Spaces are allowed in the selection string if they are protected.

Other example where multiple selectors are used as multiple arguments:
\f(CBps | smenu -col -cols e/TTY/ e/CMD/ e3\fP
.PP
.IP "\fB-R\fP|\fB-rs\fP|\fB-rows\fP|\fB-rows_select\fP... \fIselectors\fP..."
(Allowed in the "Columns" and "Lines" contexts.)

Similar to \fB-C\fP|\fB-cs\fP|\fB-cols\fP|\fB-cols_select\fP but for
the rows.

\fB-C\fP|\fB-cs\fP|\fB-cols\fP|\fB-cols_select\fP and
\fB-R\fP|\fB-rs\fP|\fB-rows\fP|\fB-rows_select\fP can be used more than
once in a cumulative manner:

The selection mode (selection or de-selection) is given by the first
occurrence of the options, the other occurrences will only update the
selected or de-selected ranges.

Once a column or a row has been excluded, it cannot be re-included.
.IP "\fB-A\fP|\fB-fc\fP|\fB-first_column\fP \fIregex\fP"
(Allowed in the following contexts: "Columns", "Lines" and "Tabulations".)

In column mode, forces all words matching the given regular expression
to be the first one in the displayed line.
If you want to only rely on this method to build the lines, just specify
an empty \fBregex\fP to set the end-of-line separator with
\fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\fB-line_separators\fP '')
.PP
.RS
\fI\\u\fP and \fI\\U\fP sequences can also be used in the regexp after
\fB-A\fP|\fB-fc\fP|\fB-first_column\fP.
.RE
.IP "\fB-Z\fP|\fB-lc\fP|\fB-last_column\fP \fIregex\fP"
(Allowed in the following contexts: "Columns", "Lines" and "Tabulations".)

Similar to \fB-A\fP|\fB-fc\fP|\fB-first_column\fP but forces the word
to be the latest of its line.
The same trick with
\fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\fB-line_separators\fP
can also be used.
.PP
.RS
\fI\\u\fP and \fI\\U\fP sequences can also be used in the regexp after
\fB-Z\fP|\fB-lc\fP|\fB-last_column\fP.
.RE
.IP "\fB-g\fP|\fB-gutter\fP [\fIstring\fP]"
(Allowed in the "Columns" and "Tabulations" contexts.)

Replaces the blank after each words in column or tabular mode by a column
separator.

This separator is extracted from the \fIstring\fP argument and each
of its (multibyte) character is used one after the other to fill
the gutter.

If there are more columns that gutter characters then the last character
is used for the remaining columns.

When not given, the separator defaults to a vertical bar \fI|\fP (or a
full height vertical bar if the locale is set to UTF-8).

Each character can be given in normal or \fI\\u\fP or \fI\\U\fP form in
the \fIstring\fP argument.

Example: "\f(CB|- \fP" will allow one to separate the first two columns
with '\f(CB|\fP', then '\f(CB-\fP' will be used and '\f(CB \fP' will
separate the remaining columns if any.
.IP "\fB-k\fP|\fB-ks\fP|\fB-keep_spaces\fP"
(Allowed in all contexts.)

By default, the spaces surrounding the output string will be deleted.
This option forces them to be retained.
.IP "\fB-W\fP|\fB-ws\fP|\fB-wd\fP|\fB-word_delimiters\fP|\
\fB-word_separators\fP \fIbytes\fP"
(Allowed in all contexts.)

This option can be used to specify the characters (or multibyte
sequences) which will be used to delimit the input words.

Multibyte sequences (UTF-8) can be natives of using the same ASCII
representation used in words (a leading \fI\\u\fP or \fI\\U\fP following
by up to 8 hexadecimal characters for the former and 6 hexadecimal
characters for the latter).

Non-printable characters in arguments should be given using the standard
\fI$''\fP representation.
\fI$'\\t'\fP stands for the tabulation character for example.

The default delimiters are: \fISPACE\fP, \fI$'\\t'\fP and \fI$'\\n'\fP.
.IP "\fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\
\fB-line_separators\fP \fIbytes\fP"
(Allowed in all contexts.)

This option can be used to specify the characters (or multibyte
sequences) which will be used to delimit the lines in the input stream.

Multibyte sequences (UTF-8) can be natives of using the same ASCII
representation used in words (a leading \fI\\u\fP or \fI\\U\fP following
by up to 8 hexadecimal characters for the former and 6 hexadecimal
characters for the latter).

Non-printable characters in arguments should be given using the standard
$'' representation.
$'\\n' stands for the newline character for example.

The default delimiter is: \fI$'\\n'\fP.

This option is only useful when the
\fB-c\fP|\fB-col\fP|\fB-col_mode\fP|\fB-column\fP or \fB-l\fP option is
also set.

The characters (or multibyte sequences) passed to
\fB-L\fP|\fB-ls\fP|\fB-ld\fP|\fB-line-delimiters\fP|\fB-line_separators\fP are
automatically added to the list of word delimiters as if
\fB-W\fP|\fB-ws\fP|\fB-wd\fP|\fB-word_delimiters\fP|\fB-word_separators\fP was
also used.

\fI\\u\fP and \fI\\U\fP sequences can also be used here.
.TP
.IP "\fB-q\fP|\fB-no_bar\fP|\fB-no-scroll_bar\fP"
(Allowed in all contexts.)

Prevents the display of the scroll bar.
.IP "\fB-S\fP|\fB-subst\fP... \
/\fIregex\fP/\fIrepl\fP/[\fIg\fP][\fIv\fP][\fIs\fP]"
(Allowed in all contexts.)

Post-processes the words by applying a regular expression based
substitution.
The argument must be formatted as in the \fBsed\fP editor.

This option can be used more than once.
Each substitution will be applied in sequence on each word.
This sequence can be stopped if a \fBstop\fP flag is encountered.

.RS
\fBflags:\fP
.IP * 2
The optional trailing \fBg\fP (for \fIg\fPlobal) means that all matching
occurrences shall be replaced and not only the first one.
.IP * 2
The optional trailing \fBv\fP (for \fIv\fPisual) means that the altered
words will only be used for display and search.
The modifications will \fInot\fP be reflected in the returned word.
.IP * 2
The optional trailing \fBs\fP (for \fIs\fPtop) means that no
more substitution will be allowed on this word even if another
\fB-S\fP|\fB-subst\fP is used.
.IP * 2
The optional trailing \fBi\fP (for \fIi\fPgnore case) means that the
string search operation should ignore the case for this pattern.

Small example:
\f(CBR=$(echo a b c | smenu -S /b/B/)\fP
will display \f(CR"a B c"\fP and \f(CBR\fP will contain \fIB\fP if \fI
B\fP is
selected meanwhile
\f(CBR=$(echo a b c | smenu -S /b/B/\fBv\fP)\fR
will display the same as above but \f(CBR\fP will contain the original
word \fIb\fP if \fIB\fP is selected.
In both cases, only the word \fIB\fP will be searchable and not \fIb\fP.
.RE
.IP "\fB-I\fP|\fB-si\fP|\fB-subst_included\fP... \
/\fIregex\fP/\fIrepl\fP/[\fIg\fP][\fIv\fP][\fIs\fP]"
(Allowed in all contexts.)

Post-processes the \fBselectable\fP words by applying a regular
expression based substitution (see \fB-S\fP|\fB-subst\fP for details).
.IP "\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP... \
/\fIregex\fP/\fIrepl\fP/[\fIg\fP][\fIv\fP][\fIs\fP]"
(Allowed in all contexts.)

Post-processes the \fBexcluded\fP (or \fBnon-selectable\fP)
words by applying a regular expression based substitution (see
\fB-S\fP|\fB-subst\fP for details).
.PP
.RS
The \fB/\fP separator that \fB-I\fP|\fB-si\fP|\fB-subst_included\fP and
\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP are using above can be
substituted by any other character except \fISPACE\fP, \fI\\t\fP,
\fI\\f\fP, \fI\\n\fP, \fI\\r\fP and \fI\\v\fP.
.PP
In the three previous options, \fIregex\fP is a \fBPOSIX\fP
\fBE\fPxtended \fBR\fPegular \fBE\fPxpression.
For details, please refer to the \fBregex\fP manual page.
.PP
Additionally \fI\\u\fP and \fI\\U\fP sequences can also be used in
the regexp.
.PP
.RE
If a post-processing action
(\fB-S\fP|\fB-subst\fP, \fB-I\fP|\fB-si\fP|\fB-subst_included\fP, \
\fB-E\fP|\fB-se\fP|\fB-subst_excluded\fP) results in an empty (length 0)
word, then we have two cases:
.RS
.IP "in column mode:"
Substitutions involving empty words can lead to misalignments, so it is
necessary to prohibit them and terminate the program.
These substitutions have to be made with other tools before using this
utility.
.IP "otherwise:"
The word is simply removed.
.RE
.IP "\fB-/\fP|\fB-search_method\fP \fIsearch_method\fP"
(Allowed in all contexts.)

Affects the '\fB/\fP' key to a search method.
By default '\fB/\fP' is affected to '\fIfuzzy\fP' but the argument can
be any prefix of '\fIprefix\fP', '\fIsubstring\fP' or '\fIfuzzy\fP'.
.IP "\fB-s\fP|\fB-sp\fP|\fB-start\fP|\fB-start_pattern\fP \fIpattern\fP"
(Allowed in all contexts.)

Place the cursor on the first word corresponding to the specified pattern.

\fIpattern\fP can be:
.RS
.IP * 2
A \fB#\fP immediately followed by a \fBnumber\fP giving the initial
position of the cursor (counting from 0).

If the word at this position is excluded, then the first previous non
excluded word is selected if it exists, otherwise the first non excluded
word is selected.

If this number if greater than the number of words, the cursor will be
set on the latest selectable position.
.IP * 2
A single \fB#\fP or the string \fB#last\fP to set the initial
cursor position to the latest selectable word position.
.IP * 2
A string starting with a \fB/\fP indicating that we want the cursor
to be set to the first word matching the given regular expression.
.IP * 2
A \fBprefix\fP string indicating that we want the cursor to be set on the
first word matching the string given (\fBa\fP will match \fBCancel\fP
by example).
.PP
Warning, when searching for a prefix or a regular expression, smenu
only looks for them after an eventual modification, so for example,
the command:
\f(CBsmenu -I/c/x/ -s/c <<< "a b c d"\fP won't find c and put the cursor
on \fBa\fP but \f(CBsmenu -I/c/x/v -s/c <<< "a b c d"\fP will find it and
put the cursor on the \fBx\fP substituting the \fBc\fP on screen only

\fI\\u\fP and \fI\\U\fP sequences can be used in the pattern.
.RE
.IP "\fB-x\fP|\fB-tmout\fP|\fB-timeout\fP \fItype\fP [\fIword\fP] \fIdelay\fP"
.IP "\fB-X\fP|\fB-htmout\fP|\fB-hidden_timeout\fP \fItype\fP [\fIword\fP]\
 \fIdelay\fP"
(Allowed in all contexts.)

Sets a timeout.
Three types of timeout are possible:
.RS
.TP 10
current:
At the timeout, the word under the cursor and/or the tagged words are
sent to the standard output if the \fBENTER\fP key has been pressed
.TP 10
quit:
At the timeout, nothing is selected as if the \fBq\fP key has been pressed
.TP 10
word:
At the timeout, the word given after the type is selected.
Note that this word doesn't need to be part of the words coming from
the standard input.
.PP
Each type can be be shortened as a prefix of its full name ("cur" for
"current" of "q" for "quit" per example).

The delay must be set in seconds and cannot be above 99999 seconds.

The remaining time (in seconds) is added at the end of the message
displayed above the selection window and is updated in real time each
second.

Any key except \fBENTER\fP, \fBq\fP, \fBQ\fP and \fBCTRL\ C\fP resets
the timer to its initial value.

The \fB-X\fP|\fB-htmout\fP|\fB-hidden_timeout\fP version works like
\fB-x\fP|\fB-tmout\fP|\fB-timeout\fP but no periodic remaining messages
is displayed above the selection window.
.RE
.IP "\fB-r\fP|\fB-auto_validate\fP"
(Allowed in all contexts.)

Enables \fBENTER\fP to validate the selection even in search mode.
.IP "\fB-v\fP|\fB-vb\fP|\fB-visual_bell\fP"
(Allowed in all contexts.)

By default, when searching, an alarm is produced by the terminal when
the user enters a character or makes a move which lead to no result or
to an error condition.
This argument make this beep visual by briefly showing the cursor.
.IP "\fB-Q\fP|\fB-ignore_quotes\fP"
(Allowed in all contexts.)

Using this option will remove the word grouping feature from single and
double quotes which will be considered normal characters.
For example: \f(CB"a b"\fP will be considered by smenu as two words
\fB"a\fP and \fBb"\fP and no more as a single word: \fBa b\fP.

.SH NOTES
If tabulators (\fI\\t\fP) are embedded in the input, there is no way
to replace them with the original number of spaces.
In this case use another filter (like \fIexpand\fR) to pre-process
the data.
.SH EXAMPLES
.SS 1
Simple Yes/No/Cancel request with "No" as default choice:
.PP
.nf
\f(CRIn \fBbash\fP:
  \f(CBread R <<< $(echo "Yes No Cancel" \\
               | smenu  -d -m "Please choose:" -s /N)\fP

or
  \f(CBR=$(echo "Yes No Cancel" \\
      | smenu -d -m "Please choose:" -s /N)\fP

In \fBksh\fP:
  \f(CBprint "Yes No Cancel"                \\
  | smenu -d -m "Please choose:" -s /N \\
  | read R\fP
\fP
.fi
.SS 2
Get a 3 columns report about VM statistics for the current process in
\fBbash\fP/\fBksh\fP on Linux:
.PP
.nf
\f(CBR=$(grep Vm /proc/$$/status | expand | smenu -b -W$'\\n' -t3 -g -d)\fB
.PP
\fP
.fi
.SS 3
Create a one column selection window containing the list of the first
20 LVM physical volumes.
At the end, the selection window will be erased.
This example is written in \fBksh\fP).
.PP
.nf
\f(CB
pvs -a -o pv_name --noheadings                 \\
| smenu -m "PV list" -n20 -t1 -d -s //dev/root \\
| read R
\fP
.fi

The display will have a look similar to the following with the cursor
set on the word \fI/dev/root\fP:

.nf
\f(CRPV list
/dev/md126           \\
/dev/md127           |
/dev/root            | <- cursor here.
/dev/sda2            |
/dev/sdb2            |
/dev/sdc1            |
/dev/sdc2            |
/dev/system/homevol  /
\fP
.fi
.SS "4 (advanced)"
Imagine a file named \fBsample.mnu\fP with the following content:

.nf
\f(CR--8<---------------------------------
"1 First Entry" "3 Third entry"
"2 Second entry" "4 Fourth entry"
@@@ "5 Fifth entry"
@@@
"0 Exit menu"
--8<---------------------------------
\fP
.fi

Then this quite esoteric command will render it (centered on the screen) as:

.nf
\f(CR+----------------------------------+
|            Test menu             |
|                                  |
| 1) First Entry   3) Third entry  |
| 2) Second entry  4) Fourth entry |
|                  5) Fifth entry  |
|                                  |
| 0) Exit menu                     |
+----------------------------------+
\fP
.fi

with the cursor on \fIQuit\fP and only the numbers and "Quit" selectable.

\f(CBR=$(smenu -q -d -s/Exit -M -n 30 -c        \\
          -e "@+" -E '/@+/ /'              \\
          -F -D n:1 i:1                    \\
          -m "Test menu" < sample.mnu)

The selected entry will be available in \f(CBR\fP

Try to understand it as an exercise.
.SH ENVIRONMENT
.TS
tab(@);
l l.
\fINO_COLOR\fP@force a monochrome terminal when set.
\fICTXOPT_DEBUG\fP@put the option parser in debug mode.
.TE
.SH BUGS/LIMITATIONS
Some terminal emulators, those notably based on VTE version later than
0.35 (see https://github.com/GNOME/vte/commit/01380d), have a new feature
that gives them the possibility to wrap/unwrap already displayed lines
when resizing the window.

As far as I known, there is no terminfo entry to disable that.

On these types of terminals, the automatic re-display of the output of
smenu will be disturbed and some artifacts may appear on the screen if
the terminal window is resized.
.SH AUTHORS
\(co 2015-present, Pierre Gentile (p.gen.progs@gmail.com)