shlib-project

#!/bin/sh
# shlib-project - create a development directory structure for a project
#
# This is a simple tool for setting up the developer environment for
# shlib-based tools.  For the most part this tool acts to aid in boot-strapping
# ones learning process about the development layout and is not expected to be
# used for regular development operations.
set -e

SHLIB_GIT_URL='http://github.com/major0/shlib'
error() { echo "error: $*" >&2; }
die() { echo "error: $*" >&2; exit 1; }
shlib_usage()
{
	if test "$#" -gt '0'; then
		 error "$*"
		 echo "try '${0} help' for more information" >&2
		 exit 1
	fi

	sed -e 's/	//' <<EOF
	usage: ${0} <command> [<arg>]
	A simple tool to aid in setting up shlib-dev environments.

	commands:
	  init <project>	Initialize project.
	  add <command>		Make <command> usable.
	  help			Display this help.

EOF
	exit 0
}

shlib_init()
{
	shlib_path="${PWD}"
	shlib_project="${1##*/}"
	test "${shlib_project}" = "${1}" || shlib_path="${1%/*}"
	! test -e "${shlib_path}/${shlib_project}" || die 'project already exists'
	mkdir "${shlib_path}/${shlib_project}" && cd "${shlib_path}/${shlib_project}"
	mkdir libexec
	mkdir "libexec/${shlib_project}" && cd "libexec/${shlib_project}"
	git init
	sed -e 's/	//' <<EOF > shlib.config
	project="${shlib_project}"
	version='0.0'
	description="${shlib_project}"
EOF
	git add shlib.config
	git commit -m 'Initial Commit'

	sed -e 's/	//' <<EOF > hello
	#!/usr/bin/env shlib

	cat<<EOF
	This is an example program which demonstrates using the shlib project
	directory structure.  This structure allows the development of projects
	based on shlib without needing to install shlib, or various shlib
	tools, into the target platform.

	All development on your project should be done in:
		${shlib_path}/${shlib_project}/libexec/${shlib_project}

	If you would like to make a command usable without installing it,
	simply make a symlink for the new command which points at the
	shlib-wrapper.

	For example, if you had the command:
		${shlib_path}/${shlib_project}/libexec/${shlib_project}/hello

	You would create the symlink:
		${shlib_path}/${shlib_project}/hello

	Which points at:
		${shlib_path}/${shlib_project}/libexec/shlib/shlib-wrapper

	As an alternative you can run:
		${shlib_path}/${shlib_project}/libexec/shlib/shlib-project add <command>

	Happy Hacking!
	EOF
EOF
	chmod a+rx hello
	cd ../..
	git init
	ln -s "libexec/${shlib_project}/shlib.config" shlib.config
	git add shlib.config
	ln -s libexec/shlib/shlib-wrapper hello
	git submodule add "${SHLIB_GIT_URL}" libexec/shlib
	git submodule add "file://${PWD}/libexec/${shlib_project}" "libexec/${shlib_project}"
	git commit -m 'Initial commit'
}

shlib_add()
{
	while ! test -h 'shlib.config'; do
		test "${PWD}" != '/' || die 'not in a shlib project'
		cd ..
	done
	: PWD: ${PWD}
	test -e 'shlib.config' || die 'missing shlib.config'

	unset project
	. ./shlib.config
	! test -z "${project}" || die 'project missing from shlib.config'
	test -d "libexec/${project}" || die "directory does not exist 'libexec/${project}'"
	test -f "libexec/${project}/${1}" || die "command does not exist 'libexec/${project}/${1}'"
	if ! test -d "libexec/shlib"; then
		if test -e "$(command -v 'shlib-wrapper')"; then
			ln -s "${1}" "$(command -v 'shlib-wrapper')"
			exit 0
		fi
		error 'libexec/shlib does not exist'
		echo "try 'git submodule add ${SHLIB_GIT_URL} libexec/shlib'"
		exit 1
	else
		if test -f 'libexec/shlib/shlib-wrapper'; then
			ln -s 'libexec/shlib/shlib-wrapper' "${1}"
			exit 0
		fi
	fi
	die 'shlib-wrapper missing'
}

test "$#" -gt '0' || shlib_usage 'no command specified'
SHLIB_COMMAND="${1}"
shift

test -e "$(command -v git 2>/dev/null)" || die 'git not installed'

case "${SHLIB_COMMAND}" in
(init)		shlib_init "$@"; exit;;
(add)		shlib_add "$@"; exit;;
(help)		shlib_usage;;
(*)		usage "unknown command '${SHLIB_COMMAND}'";;
esac

# vim: filetype=sh