getraw

#!/bin/bash

set -e

usage() {
	echo "Usage:"
	echo "  getraw [options] <username>/<repository>/[<path>/]<file>"
	echo ""
	echo "Options:"
	echo "  -b, --branch <branch>      Use <branch> instead of default"
	echo "  -d, --develop              Use develop branch instead of default branch"
	echo "      --dry-run              Only prints the curl command line and exits"
	echo "  -h, --help                 Display this help message"
	echo "  -p, --provider=<provider>  Use SCM <provider>, default is github. Supported"
	echo "                             providers are chisel, gitea, github, gitlab, bitbucket"
	echo "  -x, --execute              instead of printing to stdout, directly execute the file"
	exit 1
}

build_cmdline() {
	case "$PROVIDER" in
	chisel)
		CMDLINE="$CMD https://chiselapp.com/user/$USER/repository/$REPO/raw?ci=$BRANCH&filename=$FILE"
		;;

	gitea*)
		CMDLINE="$CMD https://$PROVIDER/$USER/$REPO/branch/$BRANCH/$FILE"
		;;

	github)
		CMDLINE="$CMD https://github.com/$USER/$REPO/raw/$BRANCH/$FILE"
		;;

	gitlab)
		CMDLINE="$CMD https://gitlab.com/$USER/$REPO/-/blob/$BRANCH/$FILE"
		;;

	bitbucket)
		CMDLINE="$CMD https://bitbucket.org/$USER/$REPO/raw/$BRANCH/$FILE"
		;;

	*)
		echo "Unknown provider $PROVIDER"
		exit 1
		;;

	esac
}

parse_args() {
	USAGE=0

	PROVIDER="github"
	DRY_RUN=0
	EXECUTE=0

	while [ $# -gt 0 ]; do
		case "$1" in
		--help | -h)
			USAGE=1
			;;

		--branch=*)
			BRANCH="${1#*=}"
			;;

		-b | --branch)
			shift
			BRANCH="$1"
			;;

		--provider=*)
			PROVIDER="${1#*=}"
			;;

		-p | --provider)
			shift
			PROVIDER="$1"
			;;

		--develop | -d)
			BRANCH="develop"
			;;

		--dry-run)
			DRY_RUN=1
			;;

		--execute | -x)
			EXECUTE=1
			;;

		*)
			if [ -z "$REPO" ]; then
				USER=$(echo "$1" | cut -d/ -f1)
				REPO=$(echo "$1" | cut -d/ -f2)
				FILE=$(echo "$1" | cut -d/ -f3-)
			else
				echo "to many arguments: $1"
				USAGE=1
			fi
			;;

		esac
		shift
	done

	if [ -z "$BRANCH" ]; then
		case "$PROVIDER" in
		chisel)
			BRANCH="trunk"
			;;

		gitea)
			BRANCH="master"
			;;

		*)
			BRANCH="HEAD"
			;;

		esac
	fi

	if [ $USAGE -eq 1 ]; then
		usage
		exit
	fi

	if [ -z "$REPO" ] || [ -z "$FILE" ]; then
		echo "Missing arguments!"
		usage
		exit
	fi
}

determine_download_tool() {
	if [ -n "$(command -v curl)" ]; then
		CMD="curl -fsSL"
	elif [ -n "$(command -v wget)" ]; then
		CMD="wget -O- -q"
	else
		echo "no downloader found! Please install either wget or curl." 1>&2
		exit 1
	fi
}

execute_remote_file() {
	FILE=$(mktemp)
	$CMDLINE >"$FILE"
	chmod +x "$FILE"
	$FILE
	rm "$FILE"
}

execute() {
	echo "$CMDLINE" >&2
	if [ $DRY_RUN -eq 1 ]; then
		: # do nothing on dry-run
	elif [ $EXECUTE -eq 1 ]; then
		execute_remote_file
	else
		$CMDLINE
	fi
}

main() {
	parse_args "$@"
	determine_download_tool
	build_cmdline
	execute
}

main "$@"