Add pre-commit.shellcheck hook

README.md

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+# githooks
+
+A collection of various Git hook scripts for different purposes.
+This file contains a description of what each one is used for.
+
+## pre-commit.shellcheck
+This is used in repositories containing Shell code to ensure that commits which would include code that causes `shellcheck` errors can't be committed.
+The files which are `shellchecked` are:
+- Any files for which the `file` command returns output containing 'shell script'
+- Any files which end in the `.sh` file extension
+- Any hidden files which begin with either `.bash` or `.zsh`
+
+My version of this hook is based heavily on this Gist: https://gist.github.com/wookietreiber/3bf8621274caafed543fca6a3feab284 
+Credit to [wookietreiber]<https://gist.github.com/wookietreiber> for the original.

pre-commit.shellcheck

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+#!/bin/bash
+
+set -e
+
+function check_dependencies_installed() {
+	for dependency in xargs shellcheck; do
+		if ! command -v "$dependency" &>/dev/null; then
+			printf '\e[1;31m[error]\e[0m \e[1mdependency\[0m is not installed.\n'
+			exit 1
+		fi
+	done
+}
+
+function get_staged_files {
+	if ! git rev-parse --verify HEAD &> /dev/null; then
+		printf '\e[1;31m[error]\e[0m \e[1mHEAD\e[0m does not point to a commit.\n'
+		exit 1
+	fi
+
+	git diff-index --cached --name-only HEAD
+}
+
+function get_shell_files {
+	get_staged_files | xargs 'file' | grep 'shell script' | cut -d ':' -f 1
+	get_staged_files | grep --regexp=".*\.sh$" --regexp="\.bash.*$" --regexp="\.zsh.*$"
+}
+
+#function blah {
+#
+
+	#while read -r file; do
+		#files[${files[@]}+1]="$file"
+	#done < <()
+#}
+
+function main {
+	check_dependencies_installed
+
+	declare -a files=()
+	while read -r file; do
+		files[${files[@]}+1]="$file"
+	done < <(get_shell_files)
+
+	shellcheck "${files[@]}"
+}
+
+main