Add Bash completion

flyingsnake-completion.bash

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+#
+# Bash completion for flyingsnake.
+#
+# Copyright (C) 2019 Emanuele Petriglia <inbox@emanuelepetriglia.com>
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero 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 Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+
+_flyingsnake() {
+  local current previous options words
+  COMPREPLY=()
+  current="${COMP_WORDS[$COMP_CWORD]}"
+  previous="${COMP_WORDS[$COMP_CWORD - 1]}"
+  options="-c --colors --background --no-background --blocks --no-blocks"
+  options="$options --walls --no-walls --liquids --no-liquids --wires"
+  options="$options --no-wires --paint --no-paint --help"
+
+  if [[ "$current" == -* ]]; then
+    words="$options"
+  elif [[ "$previous" == "-c" || "$previous" == "--colors" ]]; then
+    words="$(compgen -A file -X '!*.json')" # colors file.
+  else
+    words="$(compgen -A file -X '!*.wld')" # Terraria world map.
+  fi
+
+  mapfile -t COMPREPLY < <(compgen -W "$words" -- "$current")
+  return 0
+}
+
+complete -F _flyingsnake flyingsnake