Add case-insensitive sort for file order

src/filelist.c

@@ -421,12 +421,47 @@ void feh_file_dirname(char *dst, feh_file * f, int maxlen)
 	dst[n] = '\0';
 }
 
+char *to_lower_str(const char *s)
+{
+	if (!s)
+		return NULL;
+
+	char *lower = strdup(s);
+	if (!lower) {
+		return NULL;
+	}
+	for (char *ptr = lower; *ptr; ++ptr) {
+		*ptr = tolower(*ptr);
+	}
+	return lower;
+}
+
 static inline int strcmp_or_strverscmp(const char *s1, const char *s2)
 {
-	if (!opt.version_sort)
-		return(strcmp(s1, s2));
-	else
+	if (!opt.version_sort) {
+		/* Version sort disabled */
+
+		if (!opt.ignore_case_sort)
+			return(strcmp(s1, s2));
+		else
+			return(strcasecmp(s1, s2));
+	}
+
+	/* Version sort enabled */
+	if (!opt.ignore_case_sort) {
 		return(strverscmp(s1, s2));
+	} else {
+		char *lower1 = to_lower_str(s1);
+		char *lower2 = to_lower_str(s2);
+		int result;
+		if (lower1 && lower2)
+			result = strverscmp(lower1, lower2);
+		else
+			result = strverscmp(s1, s2);
+		free(lower1);
+		free(lower2);
+		return(result);
+	}
 }
 
 int feh_cmp_filename(void *file1, void *file2)

src/help.raw

@@ -57,6 +57,7 @@ OPTIONS
                            or format
  -n, --reverse             Reverse sort order
      --version-sort        Natural sort of (version) numbers within text
+     --ignore-case-sort    Case-insensistive sort for name, filename and dirname
  -A, --action [;]ACTION    Specify action to perform when pressing <return>.
                            Executed by /bin/sh, may contain FORMAT SPECIFIERS
                            reloads image with \";\", switches to next otherwise

src/options.c

@@ -438,6 +438,7 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 		{"class"         , 1, 0, OPTION_class},
 		{"no-conversion-cache", 0, 0, OPTION_no_conversion_cache},
 		{"window-id", 1, 0, OPTION_window_id},
+		{"ignore-case-sort"  , 0, 0, OPTION_ignore_case_sort},
 		{0, 0, 0, 0}
 	};
 	int optch = 0, cmdx = 0;
@@ -860,6 +861,9 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 				opt.zoom_rate = 1 + ((float)opt.zoom_rate / 100);
 			}
 			break;
+		case OPTION_ignore_case_sort:
+		    opt.ignore_case_sort = 1;
+			break;
 		default:
 			break;
 		}

src/options.h

@@ -116,6 +116,7 @@ struct __fehoptions {
 	double reload;
 	int sort;
 	int version_sort;
+	int ignore_case_sort;
 	int debug;
 	int geom_enabled;
 	int geom_flags;
@@ -256,6 +257,7 @@ OPTION_auto_reload,
 OPTION_class,
 OPTION_no_conversion_cache,
 OPTION_window_id,
+OPTION_ignore_case_sort,
 };
 
 //typedef enum __fehoption fehoption;