build.bash

#!/usr/bin/env bash
#shellcheck disable=SC2034
# Comments prefixed by BASHDOC: are hints to specific GNU Bash Manual's section:
# https://www.gnu.org/software/bash/manual/

## init function: program entrypoint
init(){
	local package_version
	export GIT_DIR="${RUNTIME_EXECUTABLE_DIRECTORY}/.git"

	package_version="$(git describe --tags --dirty --always)"

	export_svgs_to_pngs
	tar\
		--create\
		--bzip\
		--verbose\
		--file\
		"${RUNTIME_EXECUTABLE_DIRECTORY}/Software Releases/libreoffice-tw-logo-${package_version}.tar.bz2"\
		--\
		*.markdown\
		*.svg\
		*.png

	printf "\nBuild finished\n"

	exit 0
}; declare -fr init

check_runtime_dependencies(){
	for executable_name in \
		basename\
		dirname\
		realpath\
		git\
		tar\
		inkscape
	do
		if ! command -v "${executable_name}" &>/dev/null; then
			printf\
				"%s: Error: \"%s\" executable not found in executable search path!\n"\
				"${FUNCNAME[0]}"\
				"${executable_name}"\
				1>&2
			printf\
				"%s: Error: Please check your runtime dependency installation.\n"\
				"${FUNCNAME[0]}"\
				1>&2
			exit 1
		fi
	done
}; declare -fr check_runtime_dependencies; check_runtime_dependencies

export_svgs_to_pngs(){
	for svg_file in "${RUNTIME_EXECUTABLE_DIRECTORY}"/*.svg; do
		inkscape\
			--without-gui\
			--export-width=350\
			--export-width=350\
			--export-background-opacity=0.0\
			--export-png="${svg_file}.350px.png"\
			"${svg_file}"
	done
}; declare -fr export_svgs_to_pngs

## Makes debuggers' life easier - Unofficial Bash Strict Mode
## http://redsymbol.net/articles/unofficial-bash-strict-mode/
## BASHDOC: Shell Builtin Commands - Modifying Shell Behavior - The Set Builtin
### Exit prematurely if a command's return value is not 0(with some exceptions), triggers ERR trap if available.
set -o errexit

### Trap on `ERR' is inherited by shell functions, command substitutions, and subshell environment as well
set -o errtrace

### Exit prematurely if an unset variable is expanded, causing parameter expansion failure.
set -o nounset

### Let the return value of a pipeline be the value of the last (rightmost) command to exit with a non-zero status
set -o pipefail

## Non-overridable Primitive Variables
##
## BashFAQ/How do I determine the location of my script? I want to read some config files from the same place. - Greg's Wiki
## http://mywiki.wooledge.org/BashFAQ/028
RUNTIME_EXECUTABLE_FILENAME="$(basename "${BASH_SOURCE[0]}")"
declare -r RUNTIME_EXECUTABLE_FILENAME
declare -r RUNTIME_EXECUTABLE_NAME="${RUNTIME_EXECUTABLE_FILENAME%.*}"
RUNTIME_EXECUTABLE_DIRECTORY="$(dirname "$(realpath --strip "${0}")")"
declare -r RUNTIME_EXECUTABLE_DIRECTORY
declare -r RUNTIME_EXECUTABLE_PATH_ABSOLUTE="${RUNTIME_EXECUTABLE_DIRECTORY}/${RUNTIME_EXECUTABLE_FILENAME}"
declare -r RUNTIME_EXECUTABLE_PATH_RELATIVE="${0}"
declare -r RUNTIME_COMMAND_BASE="${RUNTIME_COMMAND_BASE:-${0}}"

trap_errexit(){
	printf "An error occurred and the script is prematurely aborted\n" 1>&2
	return 0
}; declare -fr trap_errexit; trap trap_errexit ERR

trap_exit(){
	return 0
}; declare -fr trap_exit; trap trap_exit EXIT

init "${@}"

## This script is based on the GNU Bash Shell Script Template project
## https://github.com/Lin-Buo-Ren/GNU-Bash-Shell-Script-Template
## and is based on the following version:
declare -r META_BASED_ON_GNU_BASH_SHELL_SCRIPT_TEMPLATE_VERSION="v1.24.1"
## You may rebase your script to incorporate new features and fixes from the template