Make all programs support --version

man/rem2ps.1.in

@@ -21,6 +21,9 @@ render characters outside the ASCII character set, see
 
 .SH OPTIONS
 .TP
+.B \-\-version
+Print the version of \fBrem2ps\fR and exit.
+.TP
 .B \-v
 Be more verbose.  This causes \fBrem2ps\fR to print progress messages
 to the standard error stream.  Normally, it is silent.

rem2pdf/bin/rem2pdf.in

@@ -628,6 +628,14 @@ to print per page; it is an integer that can range from 1 to 4.
 Print (on STDERR) the name of the month and year for each month that
 is rendered.
 
+=item --version
+
+Print the version of rem2pdf and exit.
+
+=item --help
+
+Print a brief summary of rem2pdf usage.
+
 =back
 
 =head1 USAGE

src/rem2ps.c

@@ -985,6 +985,14 @@ static void Init(int argc, char const *argv[])
 
         case 'e': FillPage = 1; break;
 
+        case '-':
+            if (!strcmp(s, "version")) {
+                printf("rem2ps version %s\n", VERSION);
+                exit(0);
+            }
+            Usage("Unrecognized option");
+            break;
+
         default: Usage("Unrecognized option");
         }
     }
@@ -1016,6 +1024,7 @@ void Usage(char const *s)
     fprintf(stderr, "-e            Make calendar fill entire page\n");
     fprintf(stderr, "-x            Put day numbers on left instead of right\n");
     fprintf(stderr, "-o[lrtb] marg Specify left, right, top and bottom margins\n");
+    fprintf(stderr, "--version     Print the version of rem2pdf and exit\n");
     exit(EXIT_FAILURE);
 }