shared: highlight directives when dumping configs

We already highlight sections and "de-highlight" comments, so let's add
the last piece of the puzzle and highlight the configuration directives
to visually distinguish them from the values.

Closes: #13416

diff --git a/src/shared/pretty-print.c b/src/shared/pretty-print.c
index 2833063d4c1391aeb6ef7a3cb3f9d903c7a7c165..cb1ac2bb768e6bf2b29930d3f7cc4048f73765e7 100644 (file)
--- a/src/shared/pretty-print.c
+++ b/src/shared/pretty-print.c
@@ -213,7 +213,7 @@ static int cat_file(const char *filename, bool newline, CatFlags flags) {
                         break;
 
                 LineType line_type = classify_line_type(line, flags);
-                if (flags & CAT_TLDR) {
+                if (FLAGS_SET(flags, CAT_TLDR)) {
                         if (line_type == LINE_SECTION) {
                                 /* The start of a section, let's not print it yet. */
                                 free_and_replace(section, line);
@@ -236,6 +236,28 @@ static int cat_file(const char *filename, bool newline, CatFlags flags) {
                         }
                 }
 
+                /* Highlight the left side (directive) of a Foo=bar assignment */
+                if (FLAGS_SET(flags, CAT_FORMAT_HAS_SECTIONS) && line_type == LINE_NORMAL) {
+                        const char *p = strchr(line, '=');
+                        if (p) {
+                                _cleanup_free_ char *highlighted = NULL, *directive = NULL;
+
+                                directive = strndup(line, p - line);
+                                if (!directive)
+                                        return log_oom();
+
+                                highlighted = strjoin(ansi_highlight_green(),
+                                                      directive,
+                                                      "=",
+                                                      ansi_normal(),
+                                                      p + 1);
+                                if (!highlighted)
+                                        return log_oom();
+
+                                free_and_replace(line, highlighted);
+                        }
+                }
+
                 printf("%s%s%s\n",
                        line_type == LINE_SECTION ? ansi_highlight_cyan() :
                        line_type == LINE_COMMENT ? ansi_highlight_grey() :