[PATCH] dircolors: consider COLORTERM sufficient for color

[Arsen Arsenović]

COLORTERM is an environment used usually to expose truecolor support in
terminal emulators. If a terminal emulator supports truecolor, it is
surely reasonable to assume it also supports 8/16/256 colors.

This implicitly supports foot, alacritty and any other truecolor
terminal emulator with unmatched $TERM.
---
Good evening,

I've noticed dircolors does not work in foot and alacritty, and on previously
raised patches about adding a TERM entry for them the concern of a nongeneric
solution was brought up. This is a valid concern, and as many terminals
(including these two) export COLORTERM to advertise 24-bit color support, it'd
appear to be a good way to pick up on color support.

 src/dircolors.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/dircolors.c b/src/dircolors.c
index b8cd203..2d20486 100644
--- a/src/dircolors.c
+++ b/src/dircolors.c
@@ -243,6 +243,7 @@ dc_parse_stream (FILE *fp, char const *filename)
   size_t input_line_size = 0;
   char const *line;
   char const *term;
+  char const *colorterm;
   bool ok = true;
 
   /* State for the parser.  */
@@ -253,6 +254,14 @@ dc_parse_stream (FILE *fp, char const *filename)
   if (term == NULL || *term == '\0')
     term = "none";
 
+  /* Check for $COLORTERM */
+  colorterm = getenv ("COLORTERM");
+  if (colorterm == NULL)
+    colorterm = "";
+
+  if (*colorterm != '\0')
+    state = ST_TERMSURE;
+
   while (true)
     {
       char *keywd, *arg;
-- 
2.34.1