;;; ede/autoconf-edit.el --- Keymap for autoconf  -*- lexical-binding: t; -*-

;; Copyright (C) 1998-2000, 2009-2022 Free Software Foundation, Inc.

;; Author: Eric M. Ludlam <zappo@gnu.org>
;; Keywords: project

;; 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:
;;
;; Autoconf editing and modification support, and compatibility layer
;; for Emacses w/out autoconf mode built in.

;;; Code:
(require 'autoconf)
(declare-function ede-srecode-setup "ede/srecode")
(declare-function ede-srecode-insert "ede/srecode")

(defun autoconf-new-program (rootdir program testfile)
  "Initialize a new configure.ac in ROOTDIR for PROGRAM using TESTFILE.
ROOTDIR is the root directory of a given autoconf controlled project.
PROGRAM is the program to be configured.
TESTFILE is the file used with AC_INIT.
Configure the initial configure script using `autoconf-new-automake-string'."
  (interactive "DRoot Dir: \nsProgram: \nsTest File: ")
  (require 'ede/srecode)
  (if (bufferp rootdir)
      (set-buffer rootdir)
    (let ((cf1 (expand-file-name "configure.in" rootdir))
	  (cf2 (expand-file-name "configure.ac" rootdir)))
      (if (and (or (file-exists-p cf1) (file-exists-p cf2))
	       (not (y-or-n-p (format "File %s exists.  Start Over? "
				      (if (file-exists-p cf1)
					  cf1 cf2)
				      ))))
	  (error "Quit"))
      (find-file cf2)))
  ;; Note, we only ask about overwrite if a string/path is specified.
  (erase-buffer)
  (ede-srecode-setup)
  (ede-srecode-insert
   "file:ede-empty"
   "TEST_FILE" testfile
   "PROGRAM" program)
  )

(defvar autoconf-preferred-macro-order
  '("AC_INIT"
    "AC_CONFIG_SRCDIR"
    "AM_INIT_AUTOMAKE"
    "AM_CONFIG_HEADER"
    ;; Arg parsing
    "AC_ARG_ENABLE"
    "AC_ARG_WITH"
    ;; Programs
    "AC_PROG_MAKE_SET"
    "AC_PROG_AWK"
    "AC_PROG_CC"
    "AC_PROG_CC_C_O"
    "AC_PROG_CPP"
    "AC_PROG_CXX"
    "AC_PROG_CXXCPP"
    "AC_ISC_POSIX"
    "AC_PROG_F77"
    "AC_PROG_GCC_TRADITIONAL"
    "AC_PROG_INSTALL"
    "AC_PROG_LEX"
    "AC_PROG_LN_S"
    "AC_PROG_RANLIB"
    "AC_PROG_YACC"
    "AC_CHECK_PROG"
    "AC_CHECK_PROGS"
    "AC_PROG_LIBTOOL"
    ;; Libraries
    "AC_CHECK_LIB"
    "AC_PATH_XTRA"
    ;; Headers
    "AC_HEADER_STDC"
    "AC_HEADER_SYS_WAIT"
    "AC_HEADER_TIME"
    "AC_HEADERS"
    ;; Typedefs, structures
    "AC_TYPE_PID_T"
    "AC_TYPE_SIGNAL"
    "AC_TYPE_UID_T"
    "AC_STRUCT_TM"
    ;; Compiler characteristics
    "AC_CHECK_SIZEOF"
    "AC_C_CONST"
    ;; Library functions
    "AC_CHECK_FUNCS"
    "AC_TRY_LINK"
    ;; System Services
    ;; Other
    "AM_PATH_LISPDIR"
    "AM_INIT_GUILE_MODULE"
    ;; AC_OUTPUT is always last
    "AC_OUTPUT"
    )
  "List of macros in the order that they prefer to occur in.
This helps when inserting a macro which doesn't yet exist
by positioning it near other macros which may exist.
From the autoconf manual:
     `AC_INIT(FILE)'
     checks for programs
     checks for libraries
     checks for header files
     checks for typedefs
     checks for structures
     checks for compiler characteristics
     checks for library functions
     checks for system services
     `AC_OUTPUT([FILE...])'")

(defvar autoconf-multiple-macros
  '("AC_ARG_ENABLE"
    "AC_ARG_WITH"
    "AC_CHECK_PROGS"
    "AC_CHECK_LIB"
    "AC_CHECK_SIZEOF"
    "AC_TRY_LINK"
    )
  "Macros which appear multiple times.")

(defvar autoconf-multiple-multiple-macros
  '("AC_HEADERS" "AC_CHECK_FUNCS")
  "Macros which appear multiple times, and perform multiple queries.")

(defun autoconf-in-macro (macro)
  "Non-nil if point is in a macro of type MACRO."
  (save-excursion
    (beginning-of-line)
    (looking-at (concat "\\(A[CM]_" macro "\\|" macro "\\)"))))

(defun autoconf-find-last-macro (macro &optional ignore-bol)
  "Move to the last occurrence of MACRO, and return that point.
The last macro is usually the one in which we would like to insert more
items such as CHECK_HEADERS."
  (let ((op (point)) (atbol (if ignore-bol "" "^")))
    (goto-char (point-max))
    (if (re-search-backward (concat atbol (regexp-quote macro) "\\s-*\\((\\|$\\)") nil t)
	(progn
	  (unless ignore-bol (beginning-of-line))
	  (point))
      (goto-char op)
      nil)))

(defun autoconf-parameter-strip (param)
  "Strip the parameter PARAM of whitespace and miscellaneous characters."
  ;; force greedy match for \n.
  (when (string-match "\\`\n*\\s-*\\[?\\s-*" param)
    (setq param (substring param (match-end 0))))
  (when (string-match "\\s-*\\]?\\s-*\\'" param)
    (setq param (substring param 0  (match-beginning 0))))
  ;; Look for occurrences of backslash newline
  (while (string-match "\\s-*\\\\\\s-*\n\\s-*" param)
    (setq param (replace-match " " t t param)))
  param)

(defun autoconf-parameters-for-macro (macro &optional ignore-bol ignore-case)
  "Retrieve the parameters to MACRO.
Returns a list of the arguments passed into MACRO as strings."
  (let ((case-fold-search ignore-case))
    (save-excursion
      (when (autoconf-find-last-macro macro ignore-bol)
	(forward-sexp 1)
	(mapcar
	 #'autoconf-parameter-strip
	 (when (looking-at "(")
	   (let* ((start (+ (point) 1))
		  (end (save-excursion
			 (forward-sexp 1)
			 (- (point) 1)))
		  (ans (buffer-substring-no-properties start end)))
	     (split-string ans "," t))))))))

(defun autoconf-position-for-macro (macro)
  "Position the cursor where a new MACRO could be inserted.
This will appear at the BEGINNING of the macro MACRO should appear AFTER.
This is to make it compatible with `autoconf-find-last-macro'.
Assume that MACRO doesn't appear in the buffer yet, so search
the ordering list `autoconf-preferred-macro-order'."
  ;; Search this list backwards.. heh heh heh
  ;; This lets us do a reverse search easily.
  (let ((ml (member macro (reverse autoconf-preferred-macro-order))))
    (if (not ml) (error "Don't know how to position for %s yet" macro))
    (setq ml (cdr ml))
    (goto-char (point-max))
    (while (and ml (not (autoconf-find-last-macro (car ml))))
      (setq ml (cdr ml)))
    (if (not ml) (error "Could not find context for positioning %s" macro))))

(defun autoconf-insert-macro-at-point (macro &optional param)
  "Add MACRO at the current point with PARAM."
  (insert macro)
  (if param
      (progn
	(insert "(" param ")")
	(if (< (current-column) 3) (insert " dnl")))))

(defun autoconf-insert-new-macro (macro &optional param)
  "Add a call to MACRO in the current autoconf file.
Deals with macro order.  See `autoconf-preferred-macro-order' and
`autoconf-multiple-macros'.
Optional argument PARAM is the parameter to pass to the macro as one string."
  (cond ((member macro autoconf-multiple-macros)
	 ;; This occurs multiple times
	 (or (autoconf-find-last-macro macro)
	     (autoconf-position-for-macro macro))
	 (forward-sexp 2)
	 (end-of-line)
	 (insert "\n")
	 (autoconf-insert-macro-at-point macro param))
	((member macro autoconf-multiple-multiple-macros)
	 (if (not param)
	     (error "You must have a parameter for %s" macro))
	 (if (not (autoconf-find-last-macro macro))
	     (progn
	       ;; Doesn't exist yet....
	       (autoconf-position-for-macro macro)
	       (forward-sexp 2)
	       (end-of-line)
	       (insert "\n")
	       (autoconf-insert-macro-at-point macro param))
	   ;; Does exist, can we fit onto the current line?
	   (forward-sexp 2)
	   (down-list -1)
	   (if (> (+ (current-column) (length param))  fill-column)
	       (insert " " param)
	     (up-list 1)
	     (end-of-line)
	     (insert "\n")
	     (autoconf-insert-macro-at-point macro param))))
	((autoconf-find-last-macro macro)
	 ;; If it isn't one of the multi's, it's a singleton.
	 ;; If it exists, ignore it.
	 nil)
	(t
	 (autoconf-position-for-macro macro)
	 (forward-sexp 1)
	 (if (looking-at "\\s-*(")
	     (forward-sexp 1))
	 (end-of-line)
	 (insert "\n")
	 (autoconf-insert-macro-at-point macro param))))

(defun autoconf-find-query-for-header (header)
  "Position the cursor where HEADER is queried."
  (interactive "sHeader: ")
  (let ((op (point))
	(found t))
    (goto-char (point-min))
    (condition-case nil
	(while (not
		(progn
		  (re-search-forward
		   (concat "\\b" (regexp-quote header) "\\b"))
		  (save-excursion
		    (beginning-of-line)
		    (looking-at "AC_CHECK_HEADERS")))))
      ;; We depend on the search failing to exit our loop on failure.
      (error (setq found nil)))
    (if (not found) (goto-char op))
    found))

(defun autoconf-add-query-for-header (header)
  "Add in HEADER to be queried for in our autoconf file."
  (interactive "sHeader: ")
  (or (autoconf-find-query-for-header header)
      (autoconf-insert-new-macro "AC_CHECK_HEADERS" header)))


(defun autoconf-find-query-for-func (func)
  "Position the cursor where FUNC is queried."
  (interactive "sFunction: ")
  (let ((op (point))
	(found t))
    (goto-char (point-min))
    (condition-case nil
	(while (not
		(progn
		  (re-search-forward
		   (concat "\\b" (regexp-quote func) "\\b"))
		  (save-excursion
		    (beginning-of-line)
		    (looking-at "AC_CHECK_FUNCS")))))
      ;; We depend on the search failing to exit our loop on failure.
      (error (setq found nil)))
    (if (not found) (goto-char op))
    found))

(defun autoconf-add-query-for-func (func)
  "Add in FUNC to be queried for in our autoconf file."
  (interactive "sFunction: ")
  (or (autoconf-find-query-for-func func)
      (autoconf-insert-new-macro "AC_CHECK_FUNCS" func)))

(defvar autoconf-program-builtin
  '(("AWK" . "AC_PROG_AWK")
    ("CC" . "AC_PROG_CC")
    ("CPP" . "AC_PROG_CPP")
    ("CXX" . "AC_PROG_CXX")
    ("CXXCPP" . "AC_PROG_CXXCPP")
    ("F77" . "AC_PROG_F77")
    ("GCC_TRADITIONAL" . "AC_PROG_GCC_TRADITIONAL")
    ("INSTALL" . "AC_PROG_INSTALL")
    ("LEX" . "AC_PROG_LEX")
    ("LN_S" . "AC_PROG_LN_S")
    ("RANLIB" . "AC_PROG_RANLIB")
    ("YACC" . "AC_PROG_YACC")
    )
  "Association list of PROGRAM variables and their built-in MACRO.")

(defun autoconf-find-query-for-program (prog)
  "Position the cursor where PROG is queried.
PROG is the VARIABLE to use in autoconf to identify the program.
PROG excludes the _PROG suffix.  Thus if PROG were EMACS, then the
variable in configure.ac would be EMACS_PROG."
  (let ((op (point))
	(found t)
	(builtin (assoc prog autoconf-program-builtin)))
    (goto-char (point-min))
    (condition-case nil
	(re-search-forward
	 (concat "^"
		 (or (cdr-safe builtin)
		     (concat "AC_CHECK_PROG\\s-*(\\s-*" prog "_PROG"))
		 "\\>"))
      (error (setq found nil)))
    (if (not found) (goto-char op))
    found))

(defun autoconf-add-query-for-program (prog &optional names)
  "Add in PROG to be queried for in our autoconf file.
Optional NAMES is for non-built-in programs, and is the list
of possible names."
  (interactive "sProgram: ")
  (if (autoconf-find-query-for-program prog)
      nil
    (let ((builtin (assoc prog autoconf-program-builtin)))
      (if builtin
	  (autoconf-insert-new-macro (cdr builtin))
	;; Not built in, try the params item
	(autoconf-insert-new-macro "AC_CHECK_PROGS" (concat prog "," names))
	))))

;;; Scrappy little changes
;;
(defvar autoconf-deleted-text nil
  "Set to the last bit of text deleted during an edit.")

(defvar autoconf-inserted-text nil
  "Set to the last bit of text inserted during an edit.")

(defmacro autoconf-edit-cycle (&rest body)
  "Start an edit cycle, unsetting the modified flag if there is no change.
Optional argument BODY is the code to execute which edits the autoconf file."
  `(let ((autoconf-deleted-text nil)
	 (autoconf-inserted-text nil)
	 (mod (buffer-modified-p)))
     ,@body
     (if (and (not mod)
	      (string= autoconf-deleted-text autoconf-inserted-text))
	 (set-buffer-modified-p nil))))

(defun autoconf-parameter-count ()
  "Return the number of parameters to the function on the current line."
  (save-excursion
    (beginning-of-line)
    (let* ((end-of-cmd
	    (save-excursion
	      (if (re-search-forward "(" (point-at-eol) t)
		  (progn
		    (forward-char -1)
		    (forward-sexp 1)
		    (point))
		;; Else, just return EOL.
		(point-at-eol))))
	   (cnt 0))
      (save-restriction
	(narrow-to-region (point-at-bol) end-of-cmd)
	(condition-case nil
	    (progn
	      (down-list 1)
	      (while (re-search-forward ", ?" end-of-cmd t)
		(setq cnt (1+ cnt)))
	      (cond ((> cnt 1)
		     ;; If the # is > 1, then there is one fewer , than args.
		     (1+ cnt))
		    ((not (looking-at "\\s-*)"))
		     ;; If there are 0 args, then we have to see if there is one arg.
		     (1+ cnt))
		    (t
		     ;; Else, just return the 0.
		     cnt)))
	  (error 0))))))

(defun autoconf-delete-parameter (index)
  "Delete the INDEXth parameter from the macro starting on the current line.
Leaves the cursor where a new parameter can be inserted.
INDEX starts at 1."
  (beginning-of-line)
  (down-list 1)
  (re-search-forward ", ?" nil nil (1- index))
  (let ((end (save-excursion
	       (re-search-forward ",\\|)" (point-at-eol))
	       (forward-char -1)
	       (point))))
    (setq autoconf-deleted-text (buffer-substring (point) end))
    (delete-region (point) end)))

(defun autoconf-insert (text)
  "Insert TEXT."
  (setq autoconf-inserted-text text)
  (insert text))

(defun autoconf-set-version (version)
  "Set the version used with automake to VERSION."
  (if (not (stringp version))
      (signal 'wrong-type-argument '(stringp version)))
  (if (and (autoconf-find-last-macro "AM_INIT_AUTOMAKE")
	   (>= (autoconf-parameter-count) 2))
      ;; We can edit right here.
      nil
    ;; Else, look for AC init instead.
    (if (not (and (autoconf-find-last-macro "AC_INIT")
		  (>= (autoconf-parameter-count) 2)))
      (error "Cannot update version")))

    ;; Perform the edit.
    (autoconf-edit-cycle
     (autoconf-delete-parameter 2)
     (autoconf-insert (concat "[" version "]"))))

(defun autoconf-set-output (outputlist)
  "Set the files created in AC_OUTPUT to OUTPUTLIST.
OUTPUTLIST is a list of strings representing relative paths
to Makefiles, or other files using Autoconf substitution."
  (if (not (autoconf-find-last-macro "AC_OUTPUT"))
      (error "Cannot update version")
    (autoconf-edit-cycle
     (autoconf-delete-parameter 1)
     (autoconf-insert (mapconcat (lambda (a) a) outputlist " ")))))

(provide 'ede/autoconf-edit)

;;; ede/autoconf-edit.el ends here