completion-testing

#!/usr/bin/env bash

log() {
    echo "[$(date +"%D %T")] $@" > /dev/ttys002
}

_get_comp_var() {
    # Uses set to get the printable version of a variable (i.e. non-printable characters)
    local temp
    temp=$(set | \grep "^$1=")
    # trim the quotes around the variable
    temp=${temp#*=$\'}
    temp=${temp%*=\'}
    # Replace slash with double-slash
    temp=${temp//\/\\}
    echo ${temp}
}
__xxx_completion() {
    local current_word previous_word previous_word2 completion_options
    COMPREPLY=()
    current_word="${COMP_WORDS[COMP_CWORD]}"
    previous_word="${COMP_WORDS[COMP_CWORD-1]}"

    if [[ ${#COMP_WORDS[@]} -gt 2 ]]
    then
        previous_word2="${COMP_WORDS[COMP_CWORD-2]}"
    else
        previous_word2=""
    fi

    log "======= ${FUNCNAME} called ========="
    log "COMP_CWORD         => \"${COMP_CWORD}\""
    log "COMP_KEY           => \"${COMP_KEY}\""
    log "COMP_LINE          => \"${COMP_LINE}\""
    log "COMP_POINT         => \"${COMP_POINT}\""
    log "COMP_TYPE          => \"${COMP_TYPE}\""
    log "COMP_WORDBREAKS    => \"$(_get_comp_var COMP_WORDBREAKS)\""
    log "COMP_WORDS         => \"${COMP_WORDS[@]}\""
    log "IFS                => \"$(_get_comp_var IFS)\""

    current_word="${COMP_WORDS[COMP_CWORD]}"
    previous_word="${COMP_WORDS[COMP_CWORD-1]}"
    log "current_word       => \"${current_word}\""
    log "previous_word      => \"${previous_word}\""
    log "previous_word2     => \"${previous_word2}\""

    if [[ ${current_word} =~ ^--(base|head).* ]] || \
       [[ ${current_word} == "=" && ${previous_word} =~ ^--(base|head).* ]] || \
       [[ ${previous_word2} =~ ^--(base|head) ]]
    then
        # User is trying to manually specify the base and head for a pull request and
        # has completed setting the --head and/or --base option and needs to auto-complete
        # the remote branch to use as the option's value

        # filter out previous branches selected
        previous_word=${previous_word#--base}
        previous_word=${previous_word#--head}
        previous_word=${previous_word#=}
        # On older versions of bash this will be the branch name that was previously selected
        # On newer versions of bash this will be blank
        if [[ "${previous_word}" != "" ]]
        then
            completion_options=$(\git branch -r | \grep -v "HEAD" | \grep -v ${previous_word})
        else
            if [[ ${previous_word2} =~ ^--(base|head) ]] && (( ${COMP_CWORD} > 4 ))
            then
                completion_options=$(\git branch -r | \grep -v "HEAD" | \grep -v ${COMP_WORDS[3]})
            else
                completion_options=$(\git branch -r | \grep -v "HEAD")
            fi
        fi

        # massage what's matched so its (compatible with older versions of bash)
        current_word=${current_word#--base}
        current_word=${current_word#--head}
        current_word=${current_word#=}
    elif [[ "${COMP_LINE}" == *--base=* && ${COMP_LINE} != *--head=* ]]
    then
        # User is trying to manually specify the base and head for a pull request and
        # has completed setting the --base option and now
        # we can automatically fill in the --head part and start
        # command line completion for it as well
        completion_options="--head="
    elif [[ "${COMP_LINE}" == *--head=* && ${COMP_LINE} != *--base=* ]]
    then
        # User is trying to manually specify the base and head for a pull request and
        # has completed setting the --head option and now
        # we can automatically fill in the --base part and start
        # command line completion for it as well
        completion_options="--base="
    elif [[ ${previous_word} == --list-* ]]
    then
        # User is trying to use one of the "list" read-only style commands and needs
        # to autocomplete with the configured remotes for the current working clone
        completion_options=$(\git remote show)
    elif (( ${COMP_CWORD} < 2))
    then
        if [[ ${current_word} == -* ]]
        then
            # User is trying to specify the command line directive to use
            completion_options="--help --debug --base= --head= --version --list-pull-requests --list-milestones"
            COMPREPLY=( $(compgen -W "${completion_options}" -- ${current_word}) )
        elif [[ "${COMP_LINE}" != *--* ]]
        then
            # User is trying to specify the remote branch to issue a pull request to
            completion_options=$(\git branch -r | \grep -v "HEAD")
        fi
    fi

    COMPREPLY=( $(compgen -W "${completion_options}" -- ${current_word}) )
    [[ ${COMPREPLY} == *= ]] && compopt -o nospace

    log "completion_options => \"${completion_options}\""
    log "COMPREPLY          => \"${COMPREPLY}\""
    return 0
}

alias asdfasdf="echo \"completion-testing!!!\""
complete -F __xxx_completion asdfasdf