Merge pull request #358 from thedrow/feature/packer-completion

Added packer bash completion.

completion/available/packer.completion.bash

@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+# Packer (http://www.packer.io) bash completion
+#
+# This script provides bash completion for packer and supports:
+#
+# - template filename completion (*.json) in cwd
+# - support for basic options (i.e.. -debug)
+# - support for complex options (i.e. -parallel=[true|false]
+#
+# The scirpt has been successfully tested with packer-0.6.0 and the
+# following OS:
+#
+# - OS X 10.9
+# - CentOS-6.5
+# - Ubuntu 12.04 Server
+#
+# The script technically is heavily inspired by the git-completion.bash
+# script. Kudos to Shawn O. Pearce <spearce@spearce.org> and all other
+# contributors for the inspiration and especially to the bash-completion
+# team in general.
+#
+# Copyright (c) 2014 IT Services Department, University of Bern
+#
+# This script is licensed under the MIT License (MIT)
+# For licsense details see the LICENSE file included in the repository
+# or read the license text at http://opensource.org/licenses/MIT.
+#
+
+# Generates completion reply, appending a space to possible completion words,
+# if necessary.
+# It accepts 2 arguments though the second is optional:
+# 1: List of possible completion words.
+# 2: Generate possible completion matches for this word (optional).
+__packercomp ()
+{
+    local cur_="${2-$cur}"
+
+    case "$cur_" in
+    -*=)
+        ;;
+    *)
+        local c i=0 IFS=$' \t\n'
+        for c in $1; do
+            if [[ $c == "$cur_"* ]]; then
+                case $c in
+                    -*=*|*.) ;;
+                    *) c="$c " ;;
+                esac
+                COMPREPLY[i++]="$c"
+            fi
+        done
+        ;;
+    esac
+}
+
+# Generates completion reply for template files in cwd.
+__packercomp_template_file ()
+{
+    local IFS=$'\n'
+
+    COMPREPLY=($(compgen -S " " -A file -X '!*.json' -- "${cur}"))
+}
+
+# Generates completion for the build command.
+__packer_build ()
+{
+    local builders="
+        amazon-ebs amazon-instance amazon-chroot digitalocean docker
+        googlecompute openstack parallels-iso parallels-pvm qemu
+        virtualbox-iso virtualbox-ovf vmware-iso vmware-vmx"
+
+    case "$cur" in
+        -parallel=*)
+            __packercomp "false true" "${cur##-parallel=}"
+            return
+            ;;
+        -except=*)
+            __packercomp "$builders" "${cur##-except=}"
+            return
+            ;;
+        -only=*)
+            __packercomp "$builders" "${cur##-only=}"
+            return
+            ;;
+        -*)
+            __packercomp "-debug -force -machine-readable -except= -only= -parallel= -var -var-file"
+            return
+            ;;
+        *)
+    esac
+
+    __packercomp_template_file
+}
+
+# Generates completion for the fix command.
+__packer_fix ()
+{
+    __packercomp_template_file
+}
+
+# Generates completion for the inspect command.
+__packer_inspect ()
+{
+    case "$cur" in
+        -*)
+            __packercomp "-machine-readable"
+            return
+            ;;
+        *)
+    esac
+
+    __packercomp_template_file
+}
+
+# Generates completion for the validate command.
+__packer_validate ()
+{
+    __packercomp_template_file
+}
+
+# Main function for packer completion.
+#
+# Searches for a command in $COMP_WORDS. If one is found
+# the appropriate function from above is called, if not
+# completion for global options is done.
+_packer_completion ()
+{
+    cur=${COMP_WORDS[COMP_CWORD]}
+    # Words containing an equal sign get split into tokens in bash > 4, which
+    # doesn't come in handy here.
+    # This is handled here. bash < 4 does not split.
+    declare -f _get_comp_words_by_ref >/dev/null && _get_comp_words_by_ref -n = cur
+
+    COMPREPLY=()
+    local i c=1 command
+
+    while [ $c -lt $COMP_CWORD ]; do
+        i="${COMP_WORDS[c]}"
+        case "$i" in
+            -*) ;;
+            *) command="$i"; break ;;
+        esac
+        ((c++))
+    done
+
+    if [ -z $command ]; then
+        case "$cur" in
+            '-'*)
+                __packercomp "-machine-readable --help --version"
+                ;;
+            *)
+                __packercomp "build fix inspect validate"
+                ;;
+        esac
+        return
+    fi
+
+    local completion_func="__packer_${command}"
+    declare -f $completion_func >/dev/null && $completion_func
+}
+
+complete -o nospace -F _packer_completion packer
+