Refactor common messages into functions

lib/print.sh

@@ -52,7 +52,25 @@ printc_init() {
 	esac
 }
 
-# Initialization.
+# Print a warning message to STDERR.
+# Arguments:
+#     1   -- The printc formatting string.
+#     ... -- The printc formatting arguments.
+print_warning() {
+	printc "%{YELLOW}[%s warning]%{CLEAR}: $1%{CLEAR}\n" "$PROGRAM" "${@:2}" 1>&2
+}
+
+# Print an error message to STDERR.
+# Arguments:
+#     1   -- The printc formatting string.
+#     ... -- The printc formatting arguments.
+print_error() {
+	printc "%{RED}[%s error]%{CLEAR}: $1%{CLEAR}\n" "$PROGRAM" "${@:2}" 1>&2
+}
+
+# -----------------------------------------------------------------------------
+# Initialization:
+# -----------------------------------------------------------------------------
 printc_init <<END
 	CLEAR	\x1B[0m
 	RED		\x1B[31m

src/batgrep.sh

@@ -92,7 +92,7 @@ while shiftopt; do
 done
 
 if [[ -z "$PATTERN" ]]; then
-	printc "%{RED}%s: no pattern provided%{CLEAR}\n" "$PROGRAM" 1>&2
+	print_error "no pattern provided"
 	exit 1
 fi
 

src/prettybat.sh

@@ -152,14 +152,14 @@ process_file() {
 		data_raw="$(cat -)"
 		data_formatted="$("formatter_${formatter}_process" "$file" 2>/dev/null <<< "$data_raw")"
 		if [[ $? -ne 0 ]]; then
-			printc "%{YELLOW}[%s warning]%{CLEAR}: 'STDIN': Unable to format with '%s'\n" "$PROGRAM" "$formatter" 1>&2
+			print_warning "'STDIN': Unable to format with '%s'" "$formatter"
 			print_file --language="$lang" - <<< "$data_raw"
 			return 1
 		fi
 	else
 		data_formatted="$("formatter_${formatter}_process" "$file" < "$file")"
 		if [[ $? -ne 0 ]]; then
-			printc "%{YELLOW}[%s warning]%{CLEAR}: '%s': Unable to format with '%s'\n" "$PROGRAM" "$file" "$formatter" 1>&2
+			print_warning "'%s': Unable to format with '%s'" "$file" "$formatter"
 			print_file --language="$lang" "$file"
 			return 1
 		fi