dotfiles

commit 3ef3b8e4e2ee7c9e060fdd163752a71fbba33c4b
parent 5c7e0664d5e4d5f337127f14c84bcb03c28d7929
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Mon, 29 Jul 2019 08:34:26 +0200

Improve watch.sh

Diffstat:
M
.local/bin/watch.sh
 | 
64
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------

1 file changed, 57 insertions(+), 7 deletions(-)
diff --git a/.local/bin/watch.sh b/.local/bin/watch.sh
@@ -1,19 +1,69 @@
-#!/usr/bin/env bash
-set -e
+#!/bin/sh
+
+version=1.0
+waitsecs=5
+
+show_help() {
+	echo "usage: ${0##*/} [OPTIONS] COMMAND"
+	echo "will repeatedly run COMMAND every $waitsecs seconds."
+	echo
+	echo "OPTIONS are one or more of the following:"
+	echo "   -h, --help              show this message"
+	echo "   -v, --version           show version and license information"
+	echo "   -n, --interval SECONDS  interval between command invocations"
+	echo "   --                      do not consider any following args as options"
+}
+
+show_version() {
+	echo "${0##*/} version $version"
+	echo "Licensed under the GNU Public License, v3+"
+	echo "written by Anders Damsgaard, anders@adamsgaard.dk"
+	echo "https://gitlab.com/admesg/dotfiles"
+}
+
+die() {
+	printf '%s\n' "$1" >&2
+	exit 1
+}
 
 [ -f ~/.commands.sh ] && . ~/.commands.sh
 
-waitsecs=5
+while :; do
+	case "$1" in
+		-h|-\?|--help)
+			show_help
+			exit 0
+			;;
+		-v|--version)
+			show_version
+			exit 0
+			;;
+		-n|--interval)
+			waitsecs="$2"
+			shift
+			;;
+		--) # end all options
+			shift
+			break
+			;;
+		-?*)
+			die 'Error: Unknown option specified'
+			;;
+		*)  # No more options
+			break
+	esac
+	shift
+done
 
 if [ $# -lt 1 ]; then
-    (>&2 echo "Error: $0 needs to be passed a command");
-    exit 1
+	show_help
+	exit 1
 fi
 
 while : ; do
     clear
-    echo -n "Every ${waitsecs}s: $*"
-    echo -e "\t  $(hostname): $(date)\n"
+    printf "%s" "Every ${waitsecs}s: $*"
+    printf "\t  %s\n" "$(hostname): $(date)"
     "$@"
     sleep "$waitsecs"
 done