Fix #104894: Toggle comments assumes '#' prefix (failing for OSL)

Add comment line prefix to format struct so each language can define
it's own comment prefix.

Ref !104953.

source/blender/blenkernel/BKE_text.h

@@ -103,9 +103,9 @@ bool txt_add_char(struct Text *text, unsigned int add);
 bool txt_add_raw_char(struct Text *text, unsigned int add);
 bool txt_replace_char(struct Text *text, unsigned int add);
 bool txt_unindent(struct Text *text);
-void txt_comment(struct Text *text);
 void txt_indent(struct Text *text);
-bool txt_uncomment(struct Text *text);
+void txt_comment(struct Text *text, const char *prefix);
+bool txt_uncomment(struct Text *text, const char *prefix);
 void txt_move_lines(struct Text *text, int direction);
 void txt_duplicate_line(struct Text *text);
 int txt_setcurr_tab_spaces(struct Text *text, int space);

source/blender/blenkernel/intern/text.c

@@ -2124,10 +2124,8 @@ static bool txt_select_unprefix(Text *text, const char *remove, const bool requi
   return changed_any;
 }
 
-void txt_comment(Text *text)
+void txt_comment(Text *text, const char *prefix)
 {
-  const char *prefix = "#";
-
   if (ELEM(NULL, text->curl, text->sell)) {
     return;
   }
@@ -2136,10 +2134,8 @@ void txt_comment(Text *text)
   txt_select_prefix(text, prefix, skip_blank_lines);
 }
 
-bool txt_uncomment(Text *text)
+bool txt_uncomment(Text *text, const char *prefix)
 {
-  const char *prefix = "#";
-
   if (ELEM(NULL, text->curl, text->sell)) {
     return false;
   }

source/blender/editors/include/ED_text.h

@@ -43,6 +43,8 @@ struct UndoStep *ED_text_undo_push_init(struct bContext *C);
 
 /* text_format.c */
 
+const char *ED_text_format_comment_line_prefix(struct Text *text);
+
 bool ED_text_is_syntax_highlight_supported(struct Text *text);
 
 #ifdef __cplusplus

source/blender/editors/space_text/text_format.c

@@ -199,6 +199,12 @@ TextFormatType *ED_text_format_get(Text *text)
   return tft_lb.first;
 }
 
+const char *ED_text_format_comment_line_prefix(Text *text)
+{
+  const struct TextFormatType *format = ED_text_format_get(text);
+  return format->comment_line;
+}
+
 bool ED_text_is_syntax_highlight_supported(Text *text)
 {
   if (text == NULL) {

source/blender/editors/space_text/text_format.h

@@ -75,6 +75,9 @@ typedef struct TextFormatType {
   void (*format_line)(SpaceText *st, TextLine *line, bool do_next);
 
   const char **ext; /* NULL terminated extensions */
+
+  /** The prefix of a single-line line comment (without trailing space). */
+  const char *comment_line;
 } TextFormatType;
 
 enum {

source/blender/editors/space_text/text_format_lua.c

@@ -341,6 +341,7 @@ void ED_text_format_register_lua(void)
   tft.format_identifier = txtfmt_lua_format_identifier;
   tft.format_line = txtfmt_lua_format_line;
   tft.ext = ext;
+  tft.comment_line = "--";
 
   ED_text_format_register(&tft);
 }

source/blender/editors/space_text/text_format_osl.c

@@ -359,6 +359,7 @@ void ED_text_format_register_osl(void)
   tft.format_identifier = txtfmt_osl_format_identifier;
   tft.format_line = txtfmt_osl_format_line;
   tft.ext = ext;
+  tft.comment_line = "//";
 
   ED_text_format_register(&tft);
 }

source/blender/editors/space_text/text_format_pov.c

@@ -936,6 +936,7 @@ void ED_text_format_register_pov(void)
   tft.format_identifier = txtfmt_pov_format_identifier;
   tft.format_line = txtfmt_pov_format_line;
   tft.ext = ext;
+  tft.comment_line = "//";
 
   ED_text_format_register(&tft);
 }

source/blender/editors/space_text/text_format_pov_ini.c

@@ -512,6 +512,7 @@ void ED_text_format_register_pov_ini(void)
   tft.format_identifier = txtfmt_pov_ini_format_identifier;
   tft.format_line = txtfmt_pov_ini_format_line;
   tft.ext = ext;
+  tft.comment_line = "//";
 
   ED_text_format_register(&tft);
 }

source/blender/editors/space_text/text_format_py.c

@@ -507,6 +507,7 @@ void ED_text_format_register_py(void)
   tft.format_identifier = txtfmt_py_format_identifier;
   tft.format_line = txtfmt_py_format_line;
   tft.ext = ext;
+  tft.comment_line = "#";
 
   ED_text_format_register(&tft);
 }

source/blender/editors/space_text/text_ops.c

@@ -1273,6 +1273,7 @@ static int text_comment_exec(bContext *C, wmOperator *op)
 {
   Text *text = CTX_data_edit_text(C);
   int type = RNA_enum_get(op->ptr, "type");
+  const char *prefix = ED_text_format_comment_line_prefix(text);
 
   text_drawcache_tag_update(CTX_wm_space_text(C), 0);
 
@@ -1284,14 +1285,14 @@ static int text_comment_exec(bContext *C, wmOperator *op)
 
   switch (type) {
     case 1:
-      txt_comment(text);
+      txt_comment(text, prefix);
       break;
     case -1:
-      txt_uncomment(text);
+      txt_uncomment(text, prefix);
       break;
     default:
-      if (txt_uncomment(text) == false) {
-        txt_comment(text);
+      if (txt_uncomment(text, prefix) == false) {
+        txt_comment(text, prefix);
       }
       break;
   }