sh(1): Allow non-printing characters in prompt strings
Introduce new prompt format characters: - '\[' starts the sequence of non-printing chatacters - '\]' ends the sequence of non-printing characters Within these sequences, the following characters are now supported: - '\a' emits ASCII BEL (0x07, 007) character - '\e' emits ASCII ESC (0x1b, 033) character - '\r' emits ASCII CR (0x0d, 015) character - '\n' emits ASCII CRLF sequence These can be used to embed ANSI sequences into prompt strings. Example in .shrc: PS1="\[\e[7m\]\u@\h\[\e[0m\]:\w \\$ " This tries to maintain some degree of compatibility with GNU bash, that uses GNU readline library (which behaves slightly different from BSD editline): It has two "non-printing boundary" characters: - RL_PROMPT_START_IGNORE (\001) - RL_PROMPT_END_IGNORE (\002) while BSD editline only has one (when using EL_PROMPT_ESC setting), so for this purpose, ASCII \001 was chosen and both \[ and \] emits this character. And while here, enlarge PROMPTLEN from 128 to 192 characters. Reviewed by: jilles Approved by: jilles Differential Revision: https://reviews.freebsd.org/D37701
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@ -190,7 +190,7 @@ histedit(void)
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if (el != NULL) {
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if (hist)
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el_set(el, EL_HIST, history, hist);
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el_set(el, EL_PROMPT, getprompt);
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el_set(el, EL_PROMPT_ESC, getprompt, '\001');
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el_set(el, EL_ADDFN, "sh-complete",
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"Filename completion",
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sh_complete);
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@ -70,7 +70,7 @@ __FBSDID("$FreeBSD$");
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* Shell command parser.
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*/
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#define PROMPTLEN 128
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#define PROMPTLEN 192
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/* values of checkkwd variable */
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#define CHKALIAS 0x1
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@ -2060,6 +2060,44 @@ getprompt(void *unused __unused)
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if (*fmt == '\\')
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switch (*++fmt) {
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/*
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* Non-printing sequence begin and end.
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*/
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case '[':
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case ']':
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ps[i] = '\001';
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break;
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/*
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* Literal \ and some ASCII characters:
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* \a BEL
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* \e ESC
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* \r CR
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*/
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case '\\':
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case 'a':
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case 'e':
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case 'r':
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if (*fmt == 'a')
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ps[i] = '\007';
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else if (*fmt == 'e')
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ps[i] = '\033';
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else if (*fmt == 'r')
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ps[i] = '\r';
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else
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ps[i] = '\\';
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break;
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/*
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* CRLF sequence
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*/
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case 'n':
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if (i < PROMPTLEN - 3) {
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ps[i++] = '\r';
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ps[i] = '\n';
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}
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break;
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/*
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* Hostname.
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*
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@ -2136,13 +2174,6 @@ getprompt(void *unused __unused)
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ps[i] = (geteuid() != 0) ? '$' : '#';
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break;
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/*
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* A literal \.
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*/
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case '\\':
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ps[i] = '\\';
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break;
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/*
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* Emit unrecognized formats verbatim.
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*/
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20
bin/sh/sh.1
20
bin/sh/sh.1
@ -32,7 +32,7 @@
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.\" from: @(#)sh.1 8.6 (Berkeley) 5/4/95
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.\" $FreeBSD$
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.\"
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.Dd May 10, 2021
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.Dd December 14, 2022
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.Dt SH 1
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.Os
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.Sh NAME
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@ -1446,6 +1446,24 @@ for normal users and
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for superusers.
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.It Li \e\e
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A literal backslash.
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.It Li \e[
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Start of a sequence of non-printing characters (used, for example,
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to embed ANSI CSI sequences into the prompt).
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.It Li \e]
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End of a sequence of non-printing characters.
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.El
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.Pp
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The following special and non-printing characters are supported
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within the sequence of non-printing characters:
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.Bl -tag -width indent
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.It Li \ea
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Emits ASCII BEL (0x07, 007) character.
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.It Li \ee
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Emits ASCII ESC (0x1b, 033) character.
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.It Li \er
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Emits ASCII CR (0x0d, 015) character.
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.It Li \en
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Emits CRLF sequence.
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.El
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.It Va PS2
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The secondary prompt string, which defaults to
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