Add -d option for debug messages

doc/ctpv.1

@@ -9,6 +9,7 @@ ctpv \- terminal previewer
 .SH SYNOPSIS
 .
 .SY ctpv
+.RI [ \-d ]
 .I  file
 .RI [ w ]
 .RI [ h ]
@@ -282,6 +283,10 @@ command to server with ID
 Kill server with ID
 .IR id .
 .
+.TP
+.B \-d
+Enable debug messages.
+.
 .SH CONFIGURATION
 .
 .B ctpv

src/ctpv.c

@@ -411,9 +411,10 @@ int main(int argc, char *argv[])
     program = argc > 0 ? argv[0] : "ctpv";
 
     ctpv.opts.shell = "/bin/sh";
+    ctpv.debug = 0;
 
     int c;
-    while ((c = getopt(argc, argv, "hs:c:e:lmv")) != -1) {
+    while ((c = getopt(argc, argv, "hs:c:e:lmdv")) != -1) {
         switch (c) {
         case 'h':
             ctpv.mode = MODE_HELP;
@@ -436,6 +437,9 @@ int main(int argc, char *argv[])
         case 'm':
             ctpv.mode = MODE_MIME;
             break;
+        case 'd':
+            ctpv.debug = 1;
+            break;
         case 'v':
             ctpv.mode = MODE_VERSION;
             break;

src/ctpv.h

@@ -20,6 +20,7 @@ struct CTPV {
         int autochafa, chafasixel, showgpg;
         char *shell;
     } opts;
+    int debug;
 };
 
 extern struct CTPV ctpv;

src/preview.c

@@ -201,10 +201,15 @@ run:
         return ERR;
     }
 
+    if (ctpv.debug)
+      fprintf(stderr, "Running preview: %s\n", p->name);
+
     ERRCHK_RET_OK(run(p, &exitcode, &signal));
 
     switch (exitcode) {
     case FAILED_PREVIEW_EC:
+        if (ctpv.debug)
+          fprintf(stderr, "Preview %s failed\n", p->name);
         i++;
         goto run;
     case ENOUGH_READ_EC: