add generated autocomplete scripts for shells

Author: TheFox0x7

contrib/autocompletion/bash_autocomplete

@@ -1,30 +1,34 @@
-#! /bin/bash
-# Heavily inspired by https://github.com/urfave/cli
+#!/bin/bash
 
-_cli_bash_autocomplete() {
+# This is a shell completion script auto-generated by https://github.com/urfave/cli for bash.
+
+# Macs have bash3 for which the bash-completion package doesn't include
+# _init_completion. This is a minimal version of that function.
+__gitea_init_completion() {
+  COMPREPLY=()
+  _get_comp_words_by_ref "$@" cur prev words cword
+}
+
+__gitea_bash_autocomplete() {
   if [[ "${COMP_WORDS[0]}" != "source" ]]; then
-    local cur opts base
+    local cur opts base words
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
+    if declare -F _init_completion >/dev/null 2>&1; then
+      _init_completion -n "=:" || return
+    else
+      __gitea_init_completion -n "=:" || return
+    fi
+    words=("${words[@]:0:$cword}")
     if [[ "$cur" == "-"* ]]; then
-      opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} ${cur} --generate-bash-completion )
+      requestComp="${words[*]} ${cur} --generate-shell-completion"
     else
-      opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} --generate-bash-completion )
+      requestComp="${words[*]} --generate-shell-completion"
     fi
-    COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+    opts=$(eval "${requestComp}" 2>/dev/null)
+    COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
     return 0
   fi
 }
 
-if [ -z "$PROG" ] && [ ! "$(command -v gitea &> /dev/null)" ] ; then
-  complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete gitea
-elif [ -z "$PROG" ]; then
-  complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete ./gitea
-  complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete "$PWD/gitea"
-else
-  complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete "$PROG"
-  unset PROG
-fi
-
-
-
+complete -o bashdefault -o default -o nospace -F __gitea_bash_autocomplete gitea