support colons in SGR character attributes

Patch by Mikhail Kot <to@myrrc.dev>
With some modifications to behave more like xterm (see note below).

Example:

	printf '\033[48;2;255:0:0mtest\n'

https://invisible-island.net/xterm/ctlseqs/ctlseqs.html

Some notes:

"CSI Pm m  Character Attributes (SGR).
[...]
o   xterm allows either colons (standard) or semicolons
(legacy) to separate the subparameters (but after the
first colon, colons must be used).
This commit is contained in:
Bakkeby 2024-05-02 09:28:20 +02:00
parent 118e965d0c
commit aa5957495d
3 changed files with 6 additions and 3 deletions

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@ -1,4 +1,4 @@
Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9.1 (497a756, 2024-04-03) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9.2 (5dbcca4, 2024-05-01) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
For example to include the `alpha` patch then you would only need to flip this setting from 0 to 1 in [patches.h](https://github.com/bakkeby/st-flexipatch/blob/master/patches.def.h):
```c

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@ -1,5 +1,5 @@
# st version
VERSION = 0.9.1
VERSION = 0.9.2
# Customize below to fit your system

5
st.c
View File

@ -1498,6 +1498,7 @@ csiparse(void)
{
char *p = csiescseq.buf, *np;
long int v;
int sep = ';'; /* colon or semi-colon, but not both */
csiescseq.narg = 0;
if (*p == '?') {
@ -1518,7 +1519,9 @@ csiparse(void)
#if UNDERCURL_PATCH
readcolonargs(&p, csiescseq.narg-1, csiescseq.carg);
#endif // UNDERCURL_PATCH
if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
if (sep == ';' && *p == ':')
sep = ':'; /* allow override to colon once */
if (*p != sep || csiescseq.narg == ESC_ARG_SIZ)
break;
p++;
}