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120 lines
4.4 KiB
EmacsLisp
120 lines
4.4 KiB
EmacsLisp
;;; last-chance.el --- dangling deterrence -*- lexical-binding: t; -*-
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;; Copyright (C) 2016-2021 Free Software Foundation, Inc.
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;; Author: Thien-Thi Nguyen <ttn@gnu.org>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: maint
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;; Package: emacs
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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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;; Late 2016. In a recent build, the date in a ChangeLog file
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;; is not fontified. Turns out the face `change-log-date-face'
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;; was declared obsolete since 22.1 and removed 2016-06-23.
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;; (compile "git show c430f7e23fc2c22f251ace4254e37dea1452dfc3")
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;;
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;; This library provides a command `last-chance', which is a small
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;; combination of "git grep" and some regexp filtering. For example,
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;; if point is on the symbol `change-log-date-face' in the form:
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;;
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;; (define-obsolete-face-alias 'change-log-date-face ...)
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;;
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;; then:
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;;
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;; M-x last-chance RET
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;;
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;; will show you any references to `change-log-date-face' in the
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;; *.el files in a new buffer (in Grep mode). Hopefully you see
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;; only the obsolete declaration and can proceed w/ its removal.
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;; If not, please DTRT and refrain from the removal until those
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;; references are properly transitioned.
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;;
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;; [Insert "nobody reads ChangeLog files" lament, here. --ttn]
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;;; Code:
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(require 'grep)
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(require 'thingatpt)
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(defvar last-chance-grep-command "git grep -n -H -F -e"
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"Command that ends in \"-e\" to do the \"git grep\".
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This should include -n, -H, -F.")
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(defvar last-chance-uninteresting-regexps
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'("ChangeLog[.0-9]*:"
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"NEWS[-.0-9]*:"
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;; Add more `flush-lines' args here.
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)
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"List of regexps that match uninteresting \"git grep\" hits.")
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(defvar-local last-chance-symbol nil
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"Symbol set by `last-chance' for `last-chance-cleanup' to DTRT.")
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(defun last-chance-cleanup (buffer status)
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"Filter lines in BUFFER; append STATUS and count of removed lines.
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If BUFFER does not seem to be one created by `last-chance', do nothing.
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This function is intended to be added to `compilation-finish-functions'."
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(let ((name (buffer-local-value 'last-chance-symbol buffer))
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bef aft)
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(when name
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(with-current-buffer buffer
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(setq bef (count-lines (point-min) (point-max)))
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(goto-char (point-min))
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(search-forward last-chance-grep-command)
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(forward-line 1)
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(let ((inhibit-read-only t))
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(dolist (re last-chance-uninteresting-regexps)
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(flush-lines re))
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(keep-lines (format "\\_<%s\\_>" name)))
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(setq aft (count-lines (point-min) (point-max)))
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(goto-char (point-max))
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(insert (format "(status: %s, lines removed: %d)"
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(car (split-string status "\n"))
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(- bef aft)))))))
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(defun last-chance (symbol)
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"Grep the repo for SYMBOL, filtering the hits.
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This uses `last-chance-grep-command' to do the grep and the
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regexps in `last-chance-uninteresting-regexps' to filter the hits.
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Grepping is recursive starting under the dir that `vc-root-dir'
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finds (or the default directory if `vc-root-dir' finds nothing).
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Output goes to the *grep* buffer.
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Interactively, Emacs queries for a symbol,
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defaulting to the one at point."
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(interactive (list (read (let ((one (symbol-at-point)))
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(when one
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(setq one (symbol-name one)))
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(completing-read
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"Symbol: " obarray
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nil nil
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one nil one)))))
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(with-current-buffer
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(let ((default-directory (or (vc-root-dir)
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default-directory)))
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(grep (format "%s %s"
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last-chance-grep-command
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symbol)))
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(add-hook 'compilation-finish-functions #'last-chance-cleanup nil t)
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(setq-local last-chance-symbol symbol)))
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(provide 'last-chance)
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;;; last-chance.el ends here
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