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;;; makefile-edit.el --- Makefile editing/scanning commands. -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2021 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Utilities for editing a Makefile for EDE Makefile management commands.
;;
;; Derived from project-am.el.
;;
;; Makefile editing and scanning commands
;;
;; Formatting of a makefile
;;
;; 1) Creating an automakefile, stick in a top level comment about
;; being created by emacs
;; 2) Leave order of variable contents alone, except for SOURCE
;; SOURCE always keep in the order of .c, .h, the other stuff.
;;; Things to do
;; makefile-fill-paragraph -- refill a macro w/ backslashes
;; makefile-insert-macro -- insert "foo = "
;;; Code:
(defun makefile-beginning-of-command ()
"Move to the beginning of the current command."
(interactive)
(if (save-excursion
(forward-line -1)
(makefile-line-continued-p))
(forward-line -1))
(beginning-of-line)
(if (not (makefile-line-continued-p))
nil
(while (and (makefile-line-continued-p)
(not (bobp)))
(forward-line -1))
(forward-line 1)))
(defun makefile-end-of-command ()
"Move to the end of the current command."
(interactive)
(end-of-line)
(while (and (makefile-line-continued-p)
(not (eobp)))
(forward-line 1)
(end-of-line)))
(defun makefile-line-continued-p ()
"Return non-nil if the current line ends in continuation."
(save-excursion
(end-of-line)
(= (preceding-char) ?\\)))
;;; Programmatic editing of a Makefile
;;
(defun makefile-move-to-macro (macro &optional next)
"Move to the definition of MACRO. Return t if found.
If NEXT is non-nil, move to the next occurrence of MACRO."
(let ((oldpt (point)))
(when (not next) (goto-char (point-min)))
(if (re-search-forward (concat "^\\s-*" (regexp-quote macro) "\\s-*[+:?]?=")
nil t)
t
(goto-char oldpt)
nil)))
(defun makefile-navigate-macro (stop-before)
"In a list of files, move forward until STOP-BEFORE is reached.
STOP-BEFORE is a regular expression matching a file name."
(save-excursion
(makefile-beginning-of-command)
(let ((e (save-excursion
(makefile-end-of-command)
(point))))
(if (re-search-forward stop-before nil t)
(goto-char (match-beginning 0))
(goto-char e)))))
(defun makefile-macro-file-list (macro)
"Return a list of all files in MACRO."
(save-excursion
(goto-char (point-min))
(let ((lst nil)
(case-fold-search nil))
(while (makefile-move-to-macro macro t)
(let ((e (save-excursion
(makefile-end-of-command)
(point))))
(while (re-search-forward "\\s-*\\([-a-zA-Z0-9./_@$%(){}]+\\)\\s-*" e t)
(let ((var nil)(varexp nil)
(match (buffer-substring-no-properties
(match-beginning 1)
(match-end 1))))
(if (not (setq var (makefile-extract-varname-from-text match)))
(setq lst (cons match lst))
(setq varexp (makefile-macro-file-list var))
(dolist (V varexp)
(setq lst (cons V lst))))))))
(nreverse lst))))
(defun makefile-extract-varname-from-text (text)
"Extract the variable name from TEXT if it is a variable reference.
Return nil if it isn't a variable."
(save-match-data
(when (string-match "\\$\\s(\\([A-Za-z0-9_]+\\)\\s)" text)
(match-string 1 text))))
(provide 'ede/makefile-edit)
;;; ede/makefile-edit.el ends here
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