[babl/wip/Jehan/babl-cli-tool] bin: add a --brief/-b option.

[Jehan <jehanp src gnome org>]

commit ed1a45a230dc973325b39e45deb0a0c235010dc3
Author: Jehan <jehan girinstud io>
Date:   Fri Jul 22 11:35:58 2022 +0200

    bin: add a --brief/-b option.
    
    This will output the result as int or float values (depending on output
    format), separated by space.
    It would allow to use the output of this script for testing conversion
    (with expected output), and can also be used for chaining calls, making
    this a re-entrant CLI tool.

 bin/babl.c | 48 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 8 deletions(-)
---
diff --git a/bin/babl.c b/bin/babl.c
index 607d10b44..68f97b081 100644
--- a/bin/babl.c
+++ b/bin/babl.c
@@ -46,6 +46,7 @@ main (int    argc,
   int         set_to           = 0;
   int         set_from_profile = 0;
   int         set_to_profile   = 0;
+  int         brief_output     = 0;
   int         options_ended    = 0;
   int         n_components;
   int         data_index;
@@ -135,6 +136,11 @@ main (int    argc,
         {
           set_to_profile = 1;
         }
+      else if (strcmp (argv[i], "--brief") == 0 ||
+               strcmp (argv[i], "-b") == 0)
+        {
+          brief_output = 1;
+        }
     }
 
   from_format  = babl_format_with_space (from, from_space);
@@ -202,6 +208,11 @@ main (int    argc,
             {
               set_to_profile = 1;
             }
+          else if (strcmp (argv[i], "--brief") == 0 ||
+                   strcmp (argv[i], "-b") == 0)
+            {
+              /* Pass. */
+            }
           else
             {
               fprintf (stderr, "babl: unknown option: %s\n", argv[i]);
@@ -304,7 +315,9 @@ main (int    argc,
   n_components = babl_format_get_n_components (to_format);
   data_index   = 0;
 
-  printf ("Conversion as \"%s\":\n", babl_get_name (to_format));
+  if (! brief_output)
+    printf ("Conversion as \"%s\":\n", babl_get_name (to_format));
+
   for (c = 0; c < n_components; c++)
     {
       const Babl *arg_type = NULL;
@@ -317,7 +330,10 @@ main (int    argc,
 
           data_index += 4;
 
-          printf ("- %f\n", value);
+          if (brief_output)
+            printf ("%s%f", c > 0 ? " ":"", value);
+          else
+            printf ("- %f\n", value);
         }
       else if (strcmp (babl_get_name (arg_type), "u8") == 0)
         {
@@ -325,7 +341,10 @@ main (int    argc,
 
           data_index += 1;
 
-          printf ("- %d\n", value);
+          if (brief_output)
+            printf ("%s%d", c > 0 ? " ":"", value);
+          else
+            printf ("- %d\n", value);
         }
       else if (strcmp (babl_get_name (arg_type), "u16") == 0)
         {
@@ -333,7 +352,10 @@ main (int    argc,
 
           data_index += 2;
 
-          printf ("- %d\n", value);
+          if (brief_output)
+            printf ("%s%d", c > 0 ? " ":"", value);
+          else
+            printf ("- %d\n", value);
         }
       else if (strcmp (babl_get_name (arg_type), "u32") == 0)
         {
@@ -341,7 +363,10 @@ main (int    argc,
 
           data_index += 4;
 
-          printf ("- %d\n", value);
+          if (brief_output)
+            printf ("%s%d", c > 0 ? " ":"", value);
+          else
+            printf ("- %d\n", value);
         }
       else
         {
@@ -404,7 +429,8 @@ static void
 babl_cli_print_usage (FILE *stream)
 {
   fprintf (stream,
-           "usage: babl [options] [c1 ..]\n"
+           "Usage: babl [options] [c1 ..]\n"
+           "Convert color data from a specific Babl format and space to another.\n"
            "\n"
            "  Options:\n"
            "     -h, --help            this help information\n"
@@ -417,6 +443,12 @@ babl_cli_print_usage (FILE *stream)
            "\n"
            "     -o, --output-profile  output profile\n"
            "\n"
-           "All parameters following -- are considered components values.\n"
-           "The tool expects exactly the number of components expected by your input format.\n");
+           "     -b, --brief           brief output\n"
+           "                           it can be re-entered as input for chain conversions\n"
+           "\n"
+           "All parameters following -- are considered components values. "
+           "This is useful to input negative components.\n\n"
+           "The tool expects exactly the number of components expected by your input format.\n\n"
+           "The default input and output formats are \"R'G'B' float\" and default space is "
+           "sRGB for RGB formats, or the naive CMYK space for CMYK formats.\n");
 }