scripts: Add color to library/output_format.sh

Use the same colors as makepkg in messages. Add in the 'plain' function
as well.

To use the colors, you need to include the term_colors.sh file, or add
definitions for the colors explicitly.

Signed-off-by: William Giokas <1007380@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/library/README

@@ -2,9 +2,9 @@ This folder contains code snippets that can be reused by multiple
 scripts.  A brief description of each file follows.
 
 output_format.sh:
-Provides basic output formatting functions with levels 'msg', 'msg2',
+Provides basic output formatting functions with levels 'plain', 'msg',
-'warning' and 'error'.  The 'msg' amd 'msg2' functions print to stdout
+'msg2', 'warning' and 'error'.  The 'msg' amd 'msg2' functions print to
-and can be silenced by defining 'QUIET'.  The 'warning' and 'error'
+stdout and can be silenced by defining 'QUIET'.  The 'warning' and 'error'
 functions print to stderr with the appropriate prefix added to the
 message.
 
@@ -39,3 +39,6 @@ as mawk or busybox awk.
 size_to_human.sh:
 The reverse of human_to_size, this function takes an integer byte size and
 prints its in human readable format, with SI prefixes (e.g. MiB, TiB).
+
+term_colors.sh:
+Contains some common color settings for output_format.sh.

scripts/library/output_format.sh

@@ -1,21 +1,27 @@
+plain() {
+	(( QUIET )) && return
+	local mesg=$1; shift
+	printf "${BOLD}    ${mesg}${ALL_OFF}\n" "$@" >&1
+}
+
 msg() {
 	(( QUIET )) && return
 	local mesg=$1; shift
-	printf "==> ${mesg}\n" "$@" >&1
+	printf "${GREEN}==>${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&1
 }
 
 msg2() {
 	(( QUIET )) && return
 	local mesg=$1; shift
-	printf "  -> ${mesg}\n" "$@" >&1
+	printf "${BLUE}  ->${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&1
 }
 
 warning() {
 	local mesg=$1; shift
-	printf "==> $(gettext "WARNING:") ${mesg}\n" "$@" >&2
+	printf "${YELLOW}==> $(gettext "WARNING:")${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
 }
 
 error() {
 	local mesg=$1; shift
-	printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
+	printf "${RED}==> $(gettext "ERROR:")${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
-}
+}

scripts/library/term_colors.sh

@@ -0,0 +1,21 @@
+# check if messages are to be printed using color
+unset ALL_OFF BOLD BLUE GREEN RED YELLOW
+if [[ -t 2 && ! $USE_COLOR = "n" ]]; then
+	# prefer terminal safe colored and bold text when tput is supported
+	if tput setaf 0 &>/dev/null; then
+		ALL_OFF="$(tput sgr0)"
+		BOLD="$(tput bold)"
+		BLUE="${BOLD}$(tput setaf 4)"
+		GREEN="${BOLD}$(tput setaf 2)"
+		RED="${BOLD}$(tput setaf 1)"
+		YELLOW="${BOLD}$(tput setaf 3)"
+	else
+		ALL_OFF="\e[1;0m"
+		BOLD="\e[1;1m"
+		BLUE="${BOLD}\e[1;34m"
+		GREEN="${BOLD}\e[1;32m"
+		RED="${BOLD}\e[1;31m"
+		YELLOW="${BOLD}\e[1;33m"
+	fi
+fi
+readonly ALL_OFF BOLD BLUE GREEN RED YELLOW