add manpage and adjust exitcode

c/colors.c

@@ -276,7 +276,7 @@ int main(int argc, char **argv) {
 	if(settings.c) {
 		c = check_colors(colors);
 		if(c == 0) {
-			return 2;
+			return 1;
 		}
 	}
 

man/colors.1

@@ -0,0 +1,32 @@
+.TH COLORS 1 colors
+.SH NAME
+colors \- generate colorscheme and run hooks
+.SH SYNOPSIS
+.B colors [-hefc] [-w path]
+.SH OPTIONS
+.TP
+.B -h
+disable running hooks (implies -e)
+.TP
+.B -e
+echo colors to stdout
+.TP
+.B -c
+check colors using color checking algorithm
+.TP
+.B -f
+print wallpaper filename to stdout
+.TP
+.B -w
+provide wallpaper path
+.SH HOOKS
+When -h is not used, a program at ~/.config/cwal/handler is executed. The first sixteen arguments are the colors in the colorscheme, and the seventeenth argument is the filename.
+.SH EXIT CODES
+.TP
+.B 0
+Normal exit code
+.TP
+.B 1
+check_colors(...) failed.
+.SH AUTHOR
+randomuser