Make object key color configurable (close #1739, #1791, #2638)

Co-authored-by: David Haguenauer <ml@kurokatta.org>
Co-authored-by: Eric Pruitt <eric.pruitt@gmail.com>

docs/content/manual/manual.yml

@@ -3485,9 +3485,10 @@ sections:
         - color for strings
         - color for arrays
         - color for objects
+        - color for object keys
 
       The default color scheme is the same as setting
-      `"JQ_COLORS=1;30:0;37:0;37:0;37:0;32:1;37:1;37"`.
+      `JQ_COLORS="1;30:0;37:0;37:0;37:0;32:1;37:1;37:1;34"`.
 
       This is not a manual for VT100/ANSI escapes.  However, each of
       these color specifications should consist of two numbers separated

jq.1.prebuilt

@@ -3837,10 +3837,13 @@ color for arrays
 .IP "\(bu" 4
 color for objects
 .
+.IP "\(bu" 4
+color for object keys
+.
 .IP "" 0
 .
 .P
-The default color scheme is the same as setting \fB"JQ_COLORS=1;30:0;37:0;37:0;37:0;32:1;37:1;37"\fR\.
+The default color scheme is the same as setting \fBJQ_COLORS="1;30:0;37:0;37:0;37:0;32:1;37:1;37:1;34"\fR\.
 .
 .P
 This is not a manual for VT100/ANSI escapes\. However, each of these color specifications should consist of two numbers separated by a semi\-colon, where the first number is one of these:

src/jv_print.c

@@ -25,16 +25,14 @@
 #define COLRESET (ESC "[0m")
 
 // Color table. See https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
-// for how to choose these.
-static const jv_kind color_kinds[] =
-  {JV_KIND_NULL,   JV_KIND_FALSE, JV_KIND_TRUE, JV_KIND_NUMBER,
-   JV_KIND_STRING, JV_KIND_ARRAY, JV_KIND_OBJECT};
-static char color_bufs[sizeof(color_kinds)/sizeof(color_kinds[0])][16];
+// for how to choose these. The order is same as jv_kind definition, and
+// the last color is used for object keys.
+static char color_bufs[8][16];
 static const char *color_bufps[8];
 static const char* def_colors[] =
   {COL("1;30"),    COL("0;37"),      COL("0;37"),     COL("0;37"),
-   COL("0;32"),      COL("1;37"),     COL("1;37")};
-#define FIELD_COLOR COL("34;1")
+   COL("0;32"),    COL("1;37"),      COL("1;37"),     COL("1;34")};
+#define FIELD_COLOR (colors[7])
 
 static const char **colors = def_colors;
 
@@ -194,14 +192,9 @@ static void jv_dump_term(struct dtoa_context* C, jv x, int flags, int indent, FI
   char buf[JVP_DTOA_FMT_MAX_LEN];
   const char* color = 0;
   double refcnt = (flags & JV_PRINT_REFCOUNT) ? jv_get_refcnt(x) - 1 : -1;
-  if (flags & JV_PRINT_COLOR) {
-    for (unsigned i=0; i<sizeof(color_kinds)/sizeof(color_kinds[0]); i++) {
-      if (jv_get_kind(x) == color_kinds[i]) {
-        color = colors[i];
+  if ((flags & JV_PRINT_COLOR) && jv_get_kind(x) != JV_KIND_INVALID) {
+    color = colors[(int)jv_get_kind(x) - 1];
     put_str(color, F, S, flags & JV_PRINT_ISATTY);
-        break;
-      }
-    }
   }
   if (indent > MAX_PRINT_DEPTH) {
     put_str("<skipped: too deep>", F, S, flags & JV_PRINT_ISATTY);

tests/shtest

@@ -335,29 +335,55 @@ if [ "$($VALGRIND $Q $JQ -n '{"a":"xyz"} | halt_error(1)' 2>&1)" != '{"a":"xyz"}
 fi
 
 # Check $JQ_COLORS
+unset JQ_COLORS
+
+## Default colors, null input
 $JQ -Ccn . > $d/color
 printf '\033[1;30mnull\033[0m\n' > $d/expect
 cmp $d/color $d/expect
+
+## Set non-default color, null input
 JQ_COLORS='4;31' $JQ -Ccn . > $d/color
 printf '\033[4;31mnull\033[0m\n' > $d/expect
 cmp $d/color $d/expect
-JQ_COLORS='1;30:0;31:0;32:0;33:0;34:1;35:1;36' \
+
+## Default colors, complex input
+$JQ -Ccn '[{"a":true,"b":false},123,null]' > $d/color
+{
+  printf '\033[1;37m[\033[1;37m{'
+  printf '\033[0m\033[1;34m"a"\033['
+  printf '0m\033[1;37m:\033[0m\033['
+  printf '0;37mtrue\033[0m\033[1'
+  printf ';37m,\033[0m\033[1;34m'
+  printf '"b"\033[0m\033[1;37m:\033'
+  printf '[0m\033[0;37mfalse\033'
+  printf '[0m\033[1;37m\033[1;37'
+  printf 'm}\033[0m\033[1;37m,\033['
+  printf '0;37m123\033[0m\033[1;'
+  printf '37m,\033[1;30mnull\033'
+  printf '[0m\033[1;37m\033[1;37'
+  printf 'm]\033[0m\n'
+} > $d/expect
+cmp $d/color $d/expect
+
+## Set non-default colors, complex input
+JQ_COLORS='1;30:0;31:0;32:0;33:0;34:1;35:1;36:1;30' \
   $JQ -Ccn '[{"a":true,"b":false},123,null]' > $d/color
-(
-printf '\033[1;35m[\033[1;36m{'
-printf '\033[0m\033[34;1m"a"\033['
-printf '0m\033[1;36m:\033[0m\033['
-printf '0;32mtrue\033[0m\033[1'
-printf ';36m,\033[0m\033[34;1m'
-printf '"b"\033[0m\033[1;36m:\033'
-printf '[0m\033[0;31mfalse\033'
-printf '[0m\033[1;36m\033[1;36'
-printf 'm}\033[0m\033[1;35m,\033['
-printf '0;33m123\033[0m\033[1;'
-printf '35m,\033[1;30mnull\033'
-printf '[0m\033[1;35m\033[1;35'
-printf 'm]\033[0m\n'
-) > $d/expect
+{
+  printf '\033[1;35m[\033[1;36m{'
+  printf '\033[0m\033[1;30m"a"\033['
+  printf '0m\033[1;36m:\033[0m\033['
+  printf '0;32mtrue\033[0m\033[1'
+  printf ';36m,\033[0m\033[1;30m'
+  printf '"b"\033[0m\033[1;36m:\033'
+  printf '[0m\033[0;31mfalse\033'
+  printf '[0m\033[1;36m\033[1;36'
+  printf 'm}\033[0m\033[1;35m,\033['
+  printf '0;33m123\033[0m\033[1;'
+  printf '35m,\033[1;30mnull\033'
+  printf '[0m\033[1;35m\033[1;35'
+  printf 'm]\033[0m\n'
+} > $d/expect
 cmp $d/color $d/expect
 
 # Check garbage in JQ_COLORS.  We write each color sequence into a 16