[task #15138] Color command-line output

[Abhishek Yadav]

Follow-up Comment #2, task #15138 (project gnuastro):

Hi! I tried to color code the various outputs by creating functions of
different colors that switch the output color.
For example :

void red(){
printf("\033[1;31m");
}

void yellow(){
printf("\033[1;33m");
}

Then before printing the desired output we can simply call one of these to
activate the desired output color. Now to check that the output is printed on
terminal and not being piped we can use the "isatty(1)" function where "1" is
the parameter that checks that stdout is on terminal.
For example in the  -- verify option in the fits program:

+static int
+keywords_verify(struct fitsparams *p, fitsfile **fptr)
+{
+  int dataok, hduok, status=0;
+
+  /* Ask CFITSIO to verify the two keywords. */
+  if( fits_verify_chksum(*fptr, &dataok, &hduok, &status) )
+    gal_fits_io_error(status, NULL);
+
+  /*Applying a check to see that output is being printed on terminal itself
*/
+  if(isatty(1)){
+    /* calling the desired color function */
+    red();
+  }
+ 
+  /* Print the verification result. */
+  printf("DATASUM:  %s\n", ( dataok==1
+                             ? "Verified"
+                             : ( dataok==0 ? "NOT-PRESENT" : "INCORRECT"
)));
+  printf("CHECKSUM: %s\n", ( hduok==1
+                             ? "Verified"
+                             : ( hduok==0  ? "NOT-PRESENT" : "INCORRECT"
)));
+
+  /* Some further information. */
+  if(!p->cp.quiet)
+    printf("\n--------\n"
+           " - DATASUM:  calculated only from the HDU/extension's data (not
"
+           "keywords).\n"
+           " - CHECKSUM: calculated from the full header (data and "
+           "keywords).\n\n");
+
+  /* Return failure if any of the keywords are not verified. */
+  return (dataok==-1 || hduok==-1) ? EXIT_FAILURE : EXIT_SUCCESS;
+}

will this work for the issue ? Please give suggestions :)

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