Create 'dependencies' tool to print dependencies

Mostly reimplements the old dependency-fetching scripts from
resources/scripts/helpers/build/dependencies, though instead of
fetching the requisite dependencies for the user, it prints them to
stdout.

The scripts do not perform any downloading/installation due to root
privileges being necessary to carry it out.

2 files changed, 130 insertions, 0 deletions

diff --git a/tools/dependencies/dependencies b/tools/dependencies/dependencies
new file mode 100755
index 00000000..13d56f74
--- /dev/null
+++ b/tools/dependencies/dependencies
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2017 Andrew Robbins <contact@andrewrobbins.info>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+arguments() {
+	tool_arguments_targets "${tool}" "$@"
+}
+
+usage() {
+	tool_usage_actions "${tool}" 'print'
+	tool_usage_arguments "${tool}" "$@"
+}
+
+print() {
+	local distro="$1"
+
+	local arch="$(uname -i || uname -m)"
+	local tool_path="$(tool_path "${tool}")"
+
+	if [[ -z "${arch}" ]]; then
+		printf '\n%s\n' 'uname(1) produced no output.  Exiting' 1>&2
+
+		return 1
+	fi
+
+	dependencies_host_supported "${distro}" "${arch}" || return
+
+	local -a dependencies
+
+	for dependency_file in "${tool_path}/${CONFIGS}/${distro}/${arch}"/*; do
+		if [[ "${dependency_file##*/}" != 'README' ]]; then
+			local -i origin="${#dependencies[@]}"
+
+			mapfile -tO "${origin}" dependencies < "${dependency_file}"
+		else
+			continue
+		fi
+	done
+
+	local -a sorted
+	mapfile -t sorted < <(printf '%s\n' "${dependencies[@]}" | sort | uniq)
+
+	dependencies_print "${distro}" "${sorted[@]}"
+}
diff --git a/tools/dependencies/dependencies-helper b/tools/dependencies/dependencies-helper
new file mode 100755
index 00000000..36d2f3ea
--- /dev/null
+++ b/tools/dependencies/dependencies-helper
@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2017 Andrew Robbins <contact@andrewrobbins.info>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+dependencies_print() {
+	local distro="$1"
+	shift
+
+	if [[ "${distro}" == 'parabola' ]]; then
+		printf '\n%s\n' 'Enable the multilib repository in /etc/pacman.conf'
+		printf '\n%s\n' 'Then, run the following command as root:'
+		printf '\n%s%s\n' 'pacman -S --needed ' "$*"
+	else
+		printf '\n%s\n' 'You will need to run the following command as root:'
+		printf '\n%s%s\n' 'apt-get -y install ' "$*"
+	fi
+}
+
+dependencies_host_supported() {
+	local distro="$1"
+	local arch="$2"
+
+	dependencies_distro_supported "${distro}" || return
+	dependencies_arch_supported "${distro}" "${arch}" || return
+}
+
+dependencies_arch_supported() {
+	local distro="$1"
+	local arch="$2"
+
+	local tool_path="$(tool_path "${tool}")"
+	local distro_dir="${tool_path}/${CONFIGS}/${distro}"
+
+	if ! [[ -d "${distro_dir}/${arch}" ]]; then
+		printf '\n%s\n'  "Architecture \"${arch}\" is not supported" 1>&2
+
+		return 1
+	fi
+}
+
+dependencies_distro_supported() {
+	local distro="$1"
+
+	local tool_path="$(tool_path "${tool}")"
+	local targets_path="${tool_path}/${CONFIGS}/${TARGETS}"
+
+	local -a targets_list
+	mapfile -t targets_list < "${targets_path}"
+
+	# Necessary to properly format the string for extglob use below
+	IFS='|' eval 'local distro_list="${targets_list[*]}"'
+
+	if [[ "${distro}" != @(${distro_list}) ]]; then
+		printf '\n%s'  "Argument \"${distro}\" is not supported.  " 1>&2
+		printf '%s\n'  'Check spelling?' 1>&2
+
+		usage
+		return 1
+	fi
+}