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111 lines
4.7 KiB
EmacsLisp
111 lines
4.7 KiB
EmacsLisp
;;; pcmpl-git.el --- Completions for Git -*- lexical-binding: t -*-
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;; Copyright (C) 2022-2023 Free Software Foundation, Inc.
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;; Package: pcomplete
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This library provides completion rules for the Git program.
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;;; Code:
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(require 'pcomplete)
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(require 'vc-git)
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(defun pcmpl-git--expand-flags (args)
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"In the list of ARGS, expand arguments of the form --[no-]flag."
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(mapcan (lambda (arg) (if (string-search "[no-]" arg)
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(list (string-replace "[no-]" "" arg)
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(string-replace "[no-]" "no-" arg))
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(list arg)))
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args))
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(defun pcmpl-git--tracked-file-predicate (&rest args)
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"Return a predicate function determining the Git status of a file.
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Files listed by `git ls-files ARGS' satisfy the predicate."
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(when-let ((files (mapcar #'expand-file-name
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(ignore-errors
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(apply #'process-lines
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vc-git-program "ls-files" args)))))
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(lambda (file)
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(setq file (expand-file-name file))
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(if (string-suffix-p "/" file)
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(seq-some (lambda (f) (string-prefix-p file f))
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files)
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(member file files)))))
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(defun pcmpl-git--remote-refs (remote)
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"List the locally known Git revisions from REMOTE."
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(delq nil
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(mapcar
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(let ((re (concat "\\`" (regexp-quote remote) "/\\(.*\\)")))
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(lambda (s) (when (string-match re s) (match-string 1 s))))
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(vc-git-revision-table nil))))
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;;;###autoload
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(defun pcomplete/git ()
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"Completion for the `git' command."
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(let ((subcommands (pcomplete-from-help `(,vc-git-program "help" "-a")
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:margin "^\\( +\\)[a-z]"
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:argument "[[:alnum:]-]+")))
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(while (not (member (pcomplete-arg 1) subcommands))
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(if (string-prefix-p "-" (pcomplete-arg))
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(pcomplete-here (pcomplete-from-help `(,vc-git-program "help")
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:margin "\\(\\[\\)-"
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:separator " | "
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:description "\\`"))
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(pcomplete-here (completion-table-merge
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subcommands
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(when (string-prefix-p "-" (pcomplete-arg 1))
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(pcomplete-entries))))))
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(let ((subcmd (pcomplete-arg 1)))
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(while (pcase subcmd
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((guard (string-prefix-p "-" (pcomplete-arg)))
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(pcomplete-here
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(pcmpl-git--expand-flags
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(pcomplete-from-help `(,vc-git-program "help" ,subcmd)
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:argument
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"-+\\(?:\\[no-\\]\\)?[a-z-]+=?"))))
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;; Complete modified tracked files
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((or "add" "commit" "restore")
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(pcomplete-here
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(pcomplete-entries
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nil (pcmpl-git--tracked-file-predicate "-m"))))
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;; Complete all tracked files
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((or "mv" "rm" "grep" "status")
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(pcomplete-here
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(pcomplete-entries nil (pcmpl-git--tracked-file-predicate))))
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;; Complete revisions
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((or "branch" "merge" "rebase" "switch")
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(pcomplete-here (vc-git-revision-table nil)))
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;; Complete revisions and tracked files
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;; TODO: diff and log accept revision ranges
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((or "checkout" "reset" "show" "diff" "log")
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(pcomplete-here
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(completion-table-in-turn
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(vc-git-revision-table nil)
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(pcomplete-entries nil (pcmpl-git--tracked-file-predicate)))))
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;; Complete remotes and their revisions
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((or "fetch" "pull" "push")
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(pcomplete-here (process-lines vc-git-program "remote"))
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(pcomplete-here (pcmpl-git--remote-refs (pcomplete-arg 1)))))))))
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(provide 'pcmpl-git)
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;;; pcmpl-git.el ends here
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