Merge pull request #1246 from eparis/bash_completions

Introduce bash completions for kubecfg

misc/completions/bash/kubecfg

@@ -0,0 +1,202 @@
+#!bash
+#
+# bash completion file for core kubecfg commands
+#
+# This script provides completion of non replication controller options
+#
+# To enable the completions either:
+#  - place this file in /etc/bash_completion.d
+#  or
+#  - copy this file and add the line below to your .bashrc after
+#    bash completion features are loaded
+#     . kubecfg
+#
+# Note:
+# Currently, the completions will not work if the apiserver daemon is not
+# running on localhost on the standard port 8080
+
+__contains_word () {
+    local w word=$1; shift
+    for w in "$@"; do
+        [[ $w = "$word" ]] && return
+    done
+    return 1
+}
+
+# This should be provided by the bash-completions, but give a really simple
+# stoopid version just in case.  It works most of the time.
+if ! declare -F _get_comp_words_by_ref >/dev/null 2>&1; then
+_get_comp_words_by_ref ()
+{
+    while [ $# -gt 0 ]; do
+        case "$1" in
+        cur)
+            cur=${COMP_WORDS[COMP_CWORD]}
+            ;;
+        prev)
+            prev=${COMP_WORDS[COMP_CWORD-1]}
+            ;;
+        words)
+            words=("${COMP_WORDS[@]}")
+            ;;
+        cword)
+            cword=$COMP_CWORD
+            ;;
+        -n)
+            shift # we don't handle excludes
+            ;;
+        esac
+        shift
+    done
+}
+fi
+
+
+__has_service() {
+    local i
+    for ((i=0; i < cword; i++)); do
+        local word=${words[i]}
+        # strip everything after a / so things like pods/[id] match
+        word=${word%%/*}
+        if __contains_word "${word}" "${services[@]}" &&
+           ! __contains_word "${words[i-1]}" "${opts[@]}"; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+# call kubecfg list $1,
+# exclude blank lines
+# skip the header stuff kubecfg prints on the first 2 lines
+# append $1/ to the first column and use that in compgen
+__kubecfg_parse_list()
+{
+    local kubecfg_output
+    if kubecfg_output=$(kubecfg list "$1" 2>/dev/null); then
+        out=($(echo "${kubecfg_output}" | awk -v prefix="$1" '/^$/ {next} NR > 2 {print prefix"/"$1}'))
+        COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
+    fi
+}
+
+_kubecfg_specific_service_match()
+{
+    case "$cur" in
+        pods/*)
+            __kubecfg_parse_list pods
+            ;;
+        minions/*)
+            __kubecfg_parse_list minions
+            ;;
+        replicationControllers/*)
+            __kubecfg_parse_list replicationControllers
+            ;;
+        services/*)
+            __kubecfg_parse_list services
+            ;;
+        *)
+            if __has_service; then
+                return 0
+            fi
+            compopt -o nospace
+            COMPREPLY=( $( compgen -S / -W "${services[*]}" -- "$cur" ) )
+            ;;
+    esac
+}
+
+_kubecfg_service_match()
+{
+    if __has_service; then
+        return 0
+    fi
+
+    COMPREPLY=( $( compgen -W "${services[*]}" -- "$cur" ) )
+}
+
+_kubecfg()
+{
+    local opts=(
+            -h
+            -c
+    )
+    local -A all_services=(
+        [CREATE]="pods replicationControllers services"
+        [UPDATE]="replicationControllers"
+        [ALL]="pods replicationControllers services minions"
+    )
+    local services=(${all_services[ALL]})
+    local -A all_commands=(
+        [WITH_JSON]="create update"
+        [ALL]="create update get list delete stop rm rollingupdate resize"
+    )
+    local commands=(${all_commands[ALL]})
+
+    COMPREPLY=()
+    local command
+    local cur prev words cword
+    _get_comp_words_by_ref -n : cur prev words cword
+
+    if __contains_word "$prev" "${opts[@]}"; then
+        case $prev in
+            -c)
+                _filedir '@(json|yml|yaml)'
+                return 0
+                ;;
+            -h)
+                return 0
+                ;;
+        esac
+    fi
+
+    if [[ "$cur" = -* ]]; then
+        COMPREPLY=( $(compgen -W "${opts[*]}" -- "$cur") )
+        return 0
+    fi
+
+    # if you passed -c, you are limited to create or update
+    if __contains_word "-c" "${words[@]}"; then
+        services=(${all_services[CREATE]} ${all_services[UPDATE]})
+        commands=(${all_commands[WITH_JSON]})
+    fi
+
+    # figure out which command they are running, remembering that arguments to
+    # options don't count as the command!  So a hostname named 'create' won't
+    # trip things up
+    local i
+    for ((i=0; i < cword; i++)); do
+        if __contains_word "${words[i]}" "${commands[@]}" &&
+           ! __contains_word "${words[i-1]}" "${opts[@]}"; then
+            command=${words[i]}
+            break
+        fi
+    done
+
+    # tell the list of possible commands
+    if [[ -z ${command} ]]; then
+        COMPREPLY=( $( compgen -W "${commands[*]}" -- "$cur" ) )
+        return 0
+    fi
+
+    # remove services which you can't update given your command
+    if [[ ${command} == "create" ]]; then
+        services=(${all_services[CREATE]})
+    elif [[ ${command} == "update" ]]; then
+        services=(${all_services[UPDATE]})
+    fi
+
+    case $command in
+        create | list)
+            _kubecfg_service_match
+            ;;
+        update | get | delete)
+            _kubecfg_specific_service_match
+            ;;
+        *)
+            ;;
+    esac
+
+    return 0
+}
+
+complete -F _kubecfg kubecfg
+# ex: ts=4 sw=4 et filetype=sh