add bash completion (only for "git-bug" for now ...)

4 files changed, 570 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 1e5ffaff..5af17954 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 git-bug
+!/doc/bash_completion/git-bug
diff --git a/doc/bash_completion/git-bug b/doc/bash_completion/git-bug
new file mode 100644
index 00000000..b357f4e0
--- /dev/null
+++ b/doc/bash_completion/git-bug
@@ -0,0 +1,547 @@
+# bash completion for git-bug                              -*- shell-script -*-
+
+__git-bug_debug()
+{
+    if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then
+        echo "$*" >> "${BASH_COMP_DEBUG_FILE}"
+    fi
+}
+
+# Homebrew on Macs have version 1.3 of bash-completion which doesn't include
+# _init_completion. This is a very minimal version of that function.
+__git-bug_init_completion()
+{
+    COMPREPLY=()
+    _get_comp_words_by_ref "$@" cur prev words cword
+}
+
+__git-bug_index_of_word()
+{
+    local w word=$1
+    shift
+    index=0
+    for w in "$@"; do
+        [[ $w = "$word" ]] && return
+        index=$((index+1))
+    done
+    index=-1
+}
+
+__git-bug_contains_word()
+{
+    local w word=$1; shift
+    for w in "$@"; do
+        [[ $w = "$word" ]] && return
+    done
+    return 1
+}
+
+__git-bug_handle_reply()
+{
+    __git-bug_debug "${FUNCNAME[0]}"
+    case $cur in
+        -*)
+            if [[ $(type -t compopt) = "builtin" ]]; then
+                compopt -o nospace
+            fi
+            local allflags
+            if [ ${#must_have_one_flag[@]} -ne 0 ]; then
+                allflags=("${must_have_one_flag[@]}")
+            else
+                allflags=("${flags[*]} ${two_word_flags[*]}")
+            fi
+            COMPREPLY=( $(compgen -W "${allflags[*]}" -- "$cur") )
+            if [[ $(type -t compopt) = "builtin" ]]; then
+                [[ "${COMPREPLY[0]}" == *= ]] || compopt +o nospace
+            fi
+
+            # complete after --flag=abc
+            if [[ $cur == *=* ]]; then
+                if [[ $(type -t compopt) = "builtin" ]]; then
+                    compopt +o nospace
+                fi
+
+                local index flag
+                flag="${cur%=*}"
+                __git-bug_index_of_word "${flag}" "${flags_with_completion[@]}"
+                COMPREPLY=()
+                if [[ ${index} -ge 0 ]]; then
+                    PREFIX=""
+                    cur="${cur#*=}"
+                    ${flags_completion[${index}]}
+                    if [ -n "${ZSH_VERSION}" ]; then
+                        # zsh completion needs --flag= prefix
+                        eval "COMPREPLY=( \"\${COMPREPLY[@]/#/${flag}=}\" )"
+                    fi
+                fi
+            fi
+            return 0;
+            ;;
+    esac
+
+    # check if we are handling a flag with special work handling
+    local index
+    __git-bug_index_of_word "${prev}" "${flags_with_completion[@]}"
+    if [[ ${index} -ge 0 ]]; then
+        ${flags_completion[${index}]}
+        return
+    fi
+
+    # we are parsing a flag and don't have a special handler, no completion
+    if [[ ${cur} != "${words[cword]}" ]]; then
+        return
+    fi
+
+    local completions
+    completions=("${commands[@]}")
+    if [[ ${#must_have_one_noun[@]} -ne 0 ]]; then
+        completions=("${must_have_one_noun[@]}")
+    fi
+    if [[ ${#must_have_one_flag[@]} -ne 0 ]]; then
+        completions+=("${must_have_one_flag[@]}")
+    fi
+    COMPREPLY=( $(compgen -W "${completions[*]}" -- "$cur") )
+
+    if [[ ${#COMPREPLY[@]} -eq 0 && ${#noun_aliases[@]} -gt 0 && ${#must_have_one_noun[@]} -ne 0 ]]; then
+        COMPREPLY=( $(compgen -W "${noun_aliases[*]}" -- "$cur") )
+    fi
+
+    if [[ ${#COMPREPLY[@]} -eq 0 ]]; then
+        declare -F __custom_func >/dev/null && __custom_func
+    fi
+
+    # available in bash-completion >= 2, not always present on macOS
+    if declare -F __ltrim_colon_completions >/dev/null; then
+        __ltrim_colon_completions "$cur"
+    fi
+
+    # If there is only 1 completion and it is a flag with an = it will be completed
+    # but we don't want a space after the =
+    if [[ "${#COMPREPLY[@]}" -eq "1" ]] && [[ $(type -t compopt) = "builtin" ]] && [[ "${COMPREPLY[0]}" == --*= ]]; then
+       compopt -o nospace
+    fi
+}
+
+# The arguments should be in the form "ext1|ext2|extn"
+__git-bug_handle_filename_extension_flag()
+{
+    local ext="$1"
+    _filedir "@(${ext})"
+}
+
+__git-bug_handle_subdirs_in_dir_flag()
+{
+    local dir="$1"
+    pushd "${dir}" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1
+}
+
+__git-bug_handle_flag()
+{
+    __git-bug_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+
+    # if a command required a flag, and we found it, unset must_have_one_flag()
+    local flagname=${words[c]}
+    local flagvalue
+    # if the word contained an =
+    if [[ ${words[c]} == *"="* ]]; then
+        flagvalue=${flagname#*=} # take in as flagvalue after the =
+        flagname=${flagname%=*} # strip everything after the =
+        flagname="${flagname}=" # but put the = back
+    fi
+    __git-bug_debug "${FUNCNAME[0]}: looking for ${flagname}"
+    if __git-bug_contains_word "${flagname}" "${must_have_one_flag[@]}"; then
+        must_have_one_flag=()
+    fi
+
+    # if you set a flag which only applies to this command, don't show subcommands
+    if __git-bug_contains_word "${flagname}" "${local_nonpersistent_flags[@]}"; then
+      commands=()
+    fi
+
+    # keep flag value with flagname as flaghash
+    # flaghash variable is an associative array which is only supported in bash > 3.
+    if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then
+        if [ -n "${flagvalue}" ] ; then
+            flaghash[${flagname}]=${flagvalue}
+        elif [ -n "${words[ $((c+1)) ]}" ] ; then
+            flaghash[${flagname}]=${words[ $((c+1)) ]}
+        else
+            flaghash[${flagname}]="true" # pad "true" for bool flag
+        fi
+    fi
+
+    # skip the argument to a two word flag
+    if __git-bug_contains_word "${words[c]}" "${two_word_flags[@]}"; then
+        c=$((c+1))
+        # if we are looking for a flags value, don't show commands
+        if [[ $c -eq $cword ]]; then
+            commands=()
+        fi
+    fi
+
+    c=$((c+1))
+
+}
+
+__git-bug_handle_noun()
+{
+    __git-bug_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+
+    if __git-bug_contains_word "${words[c]}" "${must_have_one_noun[@]}"; then
+        must_have_one_noun=()
+    elif __git-bug_contains_word "${words[c]}" "${noun_aliases[@]}"; then
+        must_have_one_noun=()
+    fi
+
+    nouns+=("${words[c]}")
+    c=$((c+1))
+}
+
+__git-bug_handle_command()
+{
+    __git-bug_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+
+    local next_command
+    if [[ -n ${last_command} ]]; then
+        next_command="_${last_command}_${words[c]//:/__}"
+    else
+        if [[ $c -eq 0 ]]; then
+            next_command="_git-bug_root_command"
+        else
+            next_command="_${words[c]//:/__}"
+        fi
+    fi
+    c=$((c+1))
+    __git-bug_debug "${FUNCNAME[0]}: looking for ${next_command}"
+    declare -F "$next_command" >/dev/null && $next_command
+}
+
+__git-bug_handle_word()
+{
+    if [[ $c -ge $cword ]]; then
+        __git-bug_handle_reply
+        return
+    fi
+    __git-bug_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
+    if [[ "${words[c]}" == -* ]]; then
+        __git-bug_handle_flag
+    elif __git-bug_contains_word "${words[c]}" "${commands[@]}"; then
+        __git-bug_handle_command
+    elif [[ $c -eq 0 ]]; then
+        __git-bug_handle_command
+    elif __git-bug_contains_word "${words[c]}" "${command_aliases[@]}"; then
+        # aliashash variable is an associative array which is only supported in bash > 3.
+        if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then
+            words[c]=${aliashash[${words[c]}]}
+            __git-bug_handle_command
+        else
+            __git-bug_handle_noun
+        fi
+    else
+        __git-bug_handle_noun
+    fi
+    __git-bug_handle_word
+}
+
+_git-bug_close()
+{
+    last_command="git-bug_close"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_commands()
+{
+    last_command="git-bug_commands"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+    flags+=("--pretty")
+    flags+=("-p")
+    local_nonpersistent_flags+=("--pretty")
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_comment()
+{
+    last_command="git-bug_comment"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+    flags+=("--file=")
+    two_word_flags+=("-F")
+    local_nonpersistent_flags+=("--file=")
+    flags+=("--message=")
+    two_word_flags+=("-m")
+    local_nonpersistent_flags+=("--message=")
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_label()
+{
+    last_command="git-bug_label"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+    flags+=("--remove")
+    flags+=("-r")
+    local_nonpersistent_flags+=("--remove")
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_ls()
+{
+    last_command="git-bug_ls"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_new()
+{
+    last_command="git-bug_new"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+    flags+=("--file=")
+    two_word_flags+=("-F")
+    local_nonpersistent_flags+=("--file=")
+    flags+=("--message=")
+    two_word_flags+=("-m")
+    local_nonpersistent_flags+=("--message=")
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_open()
+{
+    last_command="git-bug_open"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_pull()
+{
+    last_command="git-bug_pull"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_push()
+{
+    last_command="git-bug_push"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_show()
+{
+    last_command="git-bug_show"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_webui()
+{
+    last_command="git-bug_webui"
+
+    command_aliases=()
+
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+_git-bug_root_command()
+{
+    last_command="git-bug"
+
+    command_aliases=()
+
+    commands=()
+    commands+=("close")
+    commands+=("commands")
+    commands+=("comment")
+    commands+=("label")
+    commands+=("ls")
+    commands+=("new")
+    commands+=("open")
+    commands+=("pull")
+    commands+=("push")
+    commands+=("show")
+    commands+=("webui")
+
+    flags=()
+    two_word_flags=()
+    local_nonpersistent_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+
+    must_have_one_flag=()
+    must_have_one_noun=()
+    noun_aliases=()
+}
+
+__start_git-bug()
+{
+    local cur prev words cword
+    declare -A flaghash 2>/dev/null || :
+    declare -A aliashash 2>/dev/null || :
+    if declare -F _init_completion >/dev/null 2>&1; then
+        _init_completion -s || return
+    else
+        __git-bug_init_completion -n "=" || return
+    fi
+
+    local c=0
+    local flags=()
+    local two_word_flags=()
+    local local_nonpersistent_flags=()
+    local flags_with_completion=()
+    local flags_completion=()
+    local commands=("git-bug")
+    local must_have_one_flag=()
+    local must_have_one_noun=()
+    local last_command
+    local nouns=()
+
+    __git-bug_handle_word
+}
+
+if [[ $(type -t compopt) = "builtin" ]]; then
+    complete -o default -F __start_git-bug git-bug
+else
+    complete -o default -o nospace -F __start_git-bug git-bug
+fi
+
+# ex: ts=4 sw=4 et filetype=sh
diff --git a/doc/gen_bash_completion.go b/doc/gen_bash_completion.go
new file mode 100644
index 00000000..df662a6c
--- /dev/null
+++ b/doc/gen_bash_completion.go
@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"github.com/MichaelMure/git-bug/commands"
+	"log"
+	"os"
+	"path"
+)
+
+func main() {
+	cwd, _ := os.Getwd()
+	filepath := path.Join(cwd, "doc", "bash_completion", "git-bug")
+
+	fmt.Println("Generating bash completion file ...")
+
+	err := commands.RootCmd.GenBashCompletionFile(filepath)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/git-bug.go b/git-bug.go
index 42b0855d..f17b1aae 100644
--- a/git-bug.go
+++ b/git-bug.go
@@ -1,6 +1,7 @@
 //go:generate go run pack_webui.go
 //go:generate go run doc/gen_markdown.go
 //go:generate go run doc/gen_manpage.go
+//go:generate go run doc/gen_bash_completion.go
 
 package main