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Diffstat (limited to 'lisp/progmodes/elisp-mode.el')
| -rw-r--r-- | lisp/progmodes/elisp-mode.el | 1372 |
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diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el new file mode 100644 index 00000000000..ac216d99cce --- /dev/null +++ b/lisp/progmodes/elisp-mode.el @@ -0,0 +1,1372 @@ +;;; elisp-mode.el --- Emacs Lisp mode -*- lexical-binding:t -*- + +;; Copyright (C) 1985-1986, 1999-2014 Free Software Foundation, Inc. + +;; Maintainer: emacs-devel@gnu.org +;; Keywords: lisp, languages +;; Package: emacs + +;; 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 <http://www.gnu.org/licenses/>. + +;;; Commentary: + +;; The major mode for editing Emacs Lisp code. +;; This mode is documented in the Emacs manual. + +;;; Code: + +(require 'lisp-mode) + +(defvar emacs-lisp-mode-abbrev-table nil) +(define-abbrev-table 'emacs-lisp-mode-abbrev-table () + "Abbrev table for Emacs Lisp mode. +It has `lisp-mode-abbrev-table' as its parent." + :parents (list lisp-mode-abbrev-table)) + +(defvar emacs-lisp-mode-syntax-table + (let ((table (make-syntax-table lisp--mode-syntax-table))) + (modify-syntax-entry ?\[ "(] " table) + (modify-syntax-entry ?\] ")[ " table) + table) + "Syntax table used in `emacs-lisp-mode'.") + +(defvar emacs-lisp-mode-map + (let ((map (make-sparse-keymap "Emacs-Lisp")) + (menu-map (make-sparse-keymap "Emacs-Lisp")) + (lint-map (make-sparse-keymap)) + (prof-map (make-sparse-keymap)) + (tracing-map (make-sparse-keymap))) + (set-keymap-parent map lisp-mode-shared-map) + (define-key map "\e\t" 'completion-at-point) + (define-key map "\e\C-x" 'eval-defun) + (define-key map "\e\C-q" 'indent-pp-sexp) + (bindings--define-key map [menu-bar emacs-lisp] + (cons "Emacs-Lisp" menu-map)) + (bindings--define-key menu-map [eldoc] + '(menu-item "Auto-Display Documentation Strings" eldoc-mode + :button (:toggle . (bound-and-true-p eldoc-mode)) + :help "Display the documentation string for the item under cursor")) + (bindings--define-key menu-map [checkdoc] + '(menu-item "Check Documentation Strings" checkdoc + :help "Check documentation strings for style requirements")) + (bindings--define-key menu-map [re-builder] + '(menu-item "Construct Regexp" re-builder + :help "Construct a regexp interactively")) + (bindings--define-key menu-map [tracing] (cons "Tracing" tracing-map)) + (bindings--define-key tracing-map [tr-a] + '(menu-item "Untrace All" untrace-all + :help "Untrace all currently traced functions")) + (bindings--define-key tracing-map [tr-uf] + '(menu-item "Untrace Function..." untrace-function + :help "Untrace function, and possibly activate all remaining advice")) + (bindings--define-key tracing-map [tr-sep] menu-bar-separator) + (bindings--define-key tracing-map [tr-q] + '(menu-item "Trace Function Quietly..." trace-function-background + :help "Trace the function with trace output going quietly to a buffer")) + (bindings--define-key tracing-map [tr-f] + '(menu-item "Trace Function..." trace-function + :help "Trace the function given as an argument")) + (bindings--define-key menu-map [profiling] (cons "Profiling" prof-map)) + (bindings--define-key prof-map [prof-restall] + '(menu-item "Remove Instrumentation for All Functions" elp-restore-all + :help "Restore the original definitions of all functions being profiled")) + (bindings--define-key prof-map [prof-restfunc] + '(menu-item "Remove Instrumentation for Function..." elp-restore-function + :help "Restore an instrumented function to its original definition")) + + (bindings--define-key prof-map [sep-rem] menu-bar-separator) + (bindings--define-key prof-map [prof-resall] + '(menu-item "Reset Counters for All Functions" elp-reset-all + :help "Reset the profiling information for all functions being profiled")) + (bindings--define-key prof-map [prof-resfunc] + '(menu-item "Reset Counters for Function..." elp-reset-function + :help "Reset the profiling information for a function")) + (bindings--define-key prof-map [prof-res] + '(menu-item "Show Profiling Results" elp-results + :help "Display current profiling results")) + (bindings--define-key prof-map [prof-pack] + '(menu-item "Instrument Package..." elp-instrument-package + :help "Instrument for profiling all function that start with a prefix")) + (bindings--define-key prof-map [prof-func] + '(menu-item "Instrument Function..." elp-instrument-function + :help "Instrument a function for profiling")) + ;; Maybe this should be in a separate submenu from the ELP stuff? + (bindings--define-key prof-map [sep-natprof] menu-bar-separator) + (bindings--define-key prof-map [prof-natprof-stop] + '(menu-item "Stop Native Profiler" profiler-stop + :help "Stop recording profiling information" + :enable (and (featurep 'profiler) + (profiler-running-p)))) + (bindings--define-key prof-map [prof-natprof-report] + '(menu-item "Show Profiler Report" profiler-report + :help "Show the current profiler report" + :enable (and (featurep 'profiler) + (profiler-running-p)))) + (bindings--define-key prof-map [prof-natprof-start] + '(menu-item "Start Native Profiler..." profiler-start + :help "Start recording profiling information")) + + (bindings--define-key menu-map [lint] (cons "Linting" lint-map)) + (bindings--define-key lint-map [lint-di] + '(menu-item "Lint Directory..." elint-directory + :help "Lint a directory")) + (bindings--define-key lint-map [lint-f] + '(menu-item "Lint File..." elint-file + :help "Lint a file")) + (bindings--define-key lint-map [lint-b] + '(menu-item "Lint Buffer" elint-current-buffer + :help "Lint the current buffer")) + (bindings--define-key lint-map [lint-d] + '(menu-item "Lint Defun" elint-defun + :help "Lint the function at point")) + (bindings--define-key menu-map [edebug-defun] + '(menu-item "Instrument Function for Debugging" edebug-defun + :help "Evaluate the top level form point is in, stepping through with Edebug" + :keys "C-u C-M-x")) + (bindings--define-key menu-map [separator-byte] menu-bar-separator) + (bindings--define-key menu-map [disas] + '(menu-item "Disassemble Byte Compiled Object..." disassemble + :help "Print disassembled code for OBJECT in a buffer")) + (bindings--define-key menu-map [byte-recompile] + '(menu-item "Byte-recompile Directory..." byte-recompile-directory + :help "Recompile every `.el' file in DIRECTORY that needs recompilation")) + (bindings--define-key menu-map [emacs-byte-compile-and-load] + '(menu-item "Byte-compile and Load" emacs-lisp-byte-compile-and-load + :help "Byte-compile the current file (if it has changed), then load compiled code")) + (bindings--define-key menu-map [byte-compile] + '(menu-item "Byte-compile This File" emacs-lisp-byte-compile + :help "Byte compile the file containing the current buffer")) + (bindings--define-key menu-map [separator-eval] menu-bar-separator) + (bindings--define-key menu-map [ielm] + '(menu-item "Interactive Expression Evaluation" ielm + :help "Interactively evaluate Emacs Lisp expressions")) + (bindings--define-key menu-map [eval-buffer] + '(menu-item "Evaluate Buffer" eval-buffer + :help "Execute the current buffer as Lisp code")) + (bindings--define-key menu-map [eval-region] + '(menu-item "Evaluate Region" eval-region + :help "Execute the region as Lisp code" + :enable mark-active)) + (bindings--define-key menu-map [eval-sexp] + '(menu-item "Evaluate Last S-expression" eval-last-sexp + :help "Evaluate sexp before point; print value in echo area")) + (bindings--define-key menu-map [separator-format] menu-bar-separator) + (bindings--define-key menu-map [comment-region] + '(menu-item "Comment Out Region" comment-region + :help "Comment or uncomment each line in the region" + :enable mark-active)) + (bindings--define-key menu-map [indent-region] + '(menu-item "Indent Region" indent-region + :help "Indent each nonblank line in the region" + :enable mark-active)) + (bindings--define-key menu-map [indent-line] + '(menu-item "Indent Line" lisp-indent-line)) + map) + "Keymap for Emacs Lisp mode. +All commands in `lisp-mode-shared-map' are inherited by this map.") + +(defun emacs-lisp-byte-compile () + "Byte compile the file containing the current buffer." + (interactive) + (if buffer-file-name + (byte-compile-file buffer-file-name) + (error "The buffer must be saved in a file first"))) + +(defun emacs-lisp-byte-compile-and-load () + "Byte-compile the current file (if it has changed), then load compiled code." + (interactive) + (or buffer-file-name + (error "The buffer must be saved in a file first")) + (require 'bytecomp) + ;; Recompile if file or buffer has changed since last compilation. + (if (and (buffer-modified-p) + (y-or-n-p (format "Save buffer %s first? " (buffer-name)))) + (save-buffer)) + (byte-recompile-file buffer-file-name nil 0 t)) + +(defun emacs-lisp-macroexpand () + "Macroexpand the form after point. +Comments in the form will be lost." + (interactive) + (let* ((start (point)) + (exp (read (current-buffer))) + ;; Compute it before, since it may signal errors. + (new (macroexpand-1 exp))) + (if (equal exp new) + (message "Not a macro call, nothing to expand") + (delete-region start (point)) + (pp new (current-buffer)) + (if (bolp) (delete-char -1)) + (indent-region start (point))))) + +(defcustom emacs-lisp-mode-hook nil + "Hook run when entering Emacs Lisp mode." + :options '(eldoc-mode imenu-add-menubar-index checkdoc-minor-mode) + :type 'hook + :group 'lisp) + +;;;###autoload +(define-derived-mode emacs-lisp-mode prog-mode "Emacs-Lisp" + "Major mode for editing Lisp code to run in Emacs. +Commands: +Delete converts tabs to spaces as it moves back. +Blank lines separate paragraphs. Semicolons start comments. + +\\{emacs-lisp-mode-map}" + :group 'lisp + (defvar xref-find-function) + (defvar xref-identifier-completion-table-function) + (lisp-mode-variables nil nil 'elisp) + (setq imenu-case-fold-search nil) + (setq-local eldoc-documentation-function + #'elisp-eldoc-documentation-function) + (setq-local xref-find-function #'elisp-xref-find) + (setq-local xref-identifier-completion-table-function + #'elisp--xref-identifier-completion-table) + (add-hook 'completion-at-point-functions + #'elisp-completion-at-point nil 'local)) + +;;; Completion at point for Elisp + +(defun elisp--local-variables-1 (vars sexp) + "Return the vars locally bound around the witness, or nil if not found." + (let (res) + (while + (unless + (setq res + (pcase sexp + (`(,(or `let `let*) ,bindings) + (let ((vars vars)) + (when (eq 'let* (car sexp)) + (dolist (binding (cdr (reverse bindings))) + (push (or (car-safe binding) binding) vars))) + (elisp--local-variables-1 + vars (car (cdr-safe (car (last bindings))))))) + (`(,(or `let `let*) ,bindings . ,body) + (let ((vars vars)) + (dolist (binding bindings) + (push (or (car-safe binding) binding) vars)) + (elisp--local-variables-1 vars (car (last body))))) + (`(lambda ,_args) + ;; FIXME: Look for the witness inside `args'. + (setq sexp nil)) + (`(lambda ,args . ,body) + (elisp--local-variables-1 + (append (remq '&optional (remq '&rest args)) vars) + (car (last body)))) + (`(condition-case ,_ ,e) (elisp--local-variables-1 vars e)) + (`(condition-case ,v ,_ . ,catches) + (elisp--local-variables-1 + (cons v vars) (cdr (car (last catches))))) + (`(quote . ,_) + ;; FIXME: Look for the witness inside sexp. + (setq sexp nil)) + ;; FIXME: Handle `cond'. + (`(,_ . ,_) + (elisp--local-variables-1 vars (car (last sexp)))) + (`elisp--witness--lisp (or vars '(nil))) + (_ nil))) + ;; We didn't find the witness in the last element so we try to + ;; backtrack to the last-but-one. + (setq sexp (ignore-errors (butlast sexp))))) + res)) + +(defun elisp--local-variables () + "Return a list of locally let-bound variables at point." + (save-excursion + (skip-syntax-backward "w_") + (let* ((ppss (syntax-ppss)) + (txt (buffer-substring-no-properties (or (car (nth 9 ppss)) (point)) + (or (nth 8 ppss) (point)))) + (closer ())) + (dolist (p (nth 9 ppss)) + (push (cdr (syntax-after p)) closer)) + (setq closer (apply #'string closer)) + (let* ((sexp (condition-case nil + (car (read-from-string + (concat txt "elisp--witness--lisp" closer))) + ((invalid-read-syntax end-of-file) nil))) + (macroexpand-advice (lambda (expander form &rest args) + (condition-case nil + (apply expander form args) + (error form)))) + (sexp + (unwind-protect + (progn + (advice-add 'macroexpand :around macroexpand-advice) + (macroexpand-all sexp)) + (advice-remove 'macroexpand macroexpand-advice))) + (vars (elisp--local-variables-1 nil sexp))) + (delq nil + (mapcar (lambda (var) + (and (symbolp var) + (not (string-match (symbol-name var) "\\`[&_]")) + ;; Eliminate uninterned vars. + (intern-soft var) + var)) + vars)))))) + +(defvar elisp--local-variables-completion-table + ;; Use `defvar' rather than `defconst' since defconst would purecopy this + ;; value, which would doubly fail: it would fail because purecopy can't + ;; handle the recursive bytecode object, and it would fail because it would + ;; move `lastpos' and `lastvars' to pure space where they'd be immutable! + (let ((lastpos nil) (lastvars nil)) + (letrec ((hookfun (lambda () + (setq lastpos nil) + (remove-hook 'post-command-hook hookfun)))) + (completion-table-dynamic + (lambda (_string) + (save-excursion + (skip-syntax-backward "_w") + (let ((newpos (cons (point) (current-buffer)))) + (unless (equal lastpos newpos) + (add-hook 'post-command-hook hookfun) + (setq lastpos newpos) + (setq lastvars + (mapcar #'symbol-name (elisp--local-variables)))))) + lastvars))))) + +(defun elisp--expect-function-p (pos) + "Return non-nil if the symbol at point is expected to be a function." + (or + (and (eq (char-before pos) ?') + (eq (char-before (1- pos)) ?#)) + (save-excursion + (let ((parent (nth 1 (syntax-ppss pos)))) + (when parent + (goto-char parent) + (and + (looking-at (concat "(\\(cl-\\)?" + (regexp-opt '("declare-function" + "function" "defadvice" + "callf" "callf2" + "defsetf")) + "[ \t\r\n]+")) + (eq (match-end 0) pos))))))) + +(defun elisp--form-quoted-p (pos) + "Return non-nil if the form at POS is not evaluated. +It can be quoted, or be inside a quoted form." + ;; FIXME: Do some macro expansion maybe. + (save-excursion + (let ((state (syntax-ppss pos))) + (or (nth 8 state) ; Code inside strings usually isn't evaluated. + ;; FIXME: The 9th element is undocumented. + (let ((nesting (cons (point) (reverse (nth 9 state)))) + res) + (while (and nesting (not res)) + (goto-char (pop nesting)) + (cond + ((or (eq (char-after) ?\[) + (progn + (skip-chars-backward " ") + (memq (char-before) '(?' ?`)))) + (setq res t)) + ((eq (char-before) ?,) + (setq nesting nil)))) + res))))) + +;; FIXME: Support for Company brings in features which straddle eldoc. +;; We should consolidate this, so that major modes can provide all that +;; data all at once: +;; - a function to extract "the reference at point" (may be more complex +;; than a mere string, to distinguish various namespaces). +;; - a function to jump to such a reference. +;; - a function to show the signature/interface of such a reference. +;; - a function to build a help-buffer about that reference. +;; FIXME: Those functions should also be used by the normal completion code in +;; the *Completions* buffer. + +(defun elisp--company-doc-buffer (str) + (let ((symbol (intern-soft str))) + ;; FIXME: we really don't want to "display-buffer and then undo it". + (save-window-excursion + ;; Make sure we don't display it in another frame, otherwise + ;; save-window-excursion won't be able to undo it. + (let ((display-buffer-overriding-action + '(nil . ((inhibit-switch-frame . t))))) + (ignore-errors + (cond + ((fboundp symbol) (describe-function symbol)) + ((boundp symbol) (describe-variable symbol)) + ((featurep symbol) (describe-package symbol)) + ((facep symbol) (describe-face symbol)) + (t (signal 'user-error nil))) + (help-buffer)))))) + +(defun elisp--company-doc-string (str) + (let* ((symbol (intern-soft str)) + (doc (if (fboundp symbol) + (documentation symbol t) + (documentation-property symbol 'variable-documentation t)))) + (and (stringp doc) + (string-match ".*$" doc) + (match-string 0 doc)))) + +(declare-function find-library-name "find-func" (library)) +(declare-function find-function-library "find-func" (function &optional l-o v)) + +(defun elisp--company-location (str) + (let ((sym (intern-soft str))) + (cond + ((fboundp sym) (find-definition-noselect sym nil)) + ((boundp sym) (find-definition-noselect sym 'defvar)) + ((featurep sym) + (require 'find-func) + (cons (find-file-noselect (find-library-name + (symbol-name sym))) + 0)) + ((facep sym) (find-definition-noselect sym 'defface))))) + +(defun elisp-completion-at-point () + "Function used for `completion-at-point-functions' in `emacs-lisp-mode'." + (with-syntax-table emacs-lisp-mode-syntax-table + (let* ((pos (point)) + (beg (condition-case nil + (save-excursion + (backward-sexp 1) + (skip-syntax-forward "'") + (point)) + (scan-error pos))) + (end + (unless (or (eq beg (point-max)) + (member (char-syntax (char-after beg)) + '(?\s ?\" ?\( ?\)))) + (condition-case nil + (save-excursion + (goto-char beg) + (forward-sexp 1) + (skip-chars-backward "'") + (when (>= (point) pos) + (point))) + (scan-error pos)))) + ;; t if in function position. + (funpos (eq (char-before beg) ?\())) + (when (and end (or (not (nth 8 (syntax-ppss))) + (eq (char-before beg) ?`))) + (let ((table-etc + (if (not funpos) + ;; FIXME: We could look at the first element of the list and + ;; use it to provide a more specific completion table in some + ;; cases. E.g. filter out keywords that are not understood by + ;; the macro/function being called. + (cond + ((elisp--expect-function-p beg) + (list nil obarray + :predicate #'fboundp + :company-doc-buffer #'elisp--company-doc-buffer + :company-docsig #'elisp--company-doc-string + :company-location #'elisp--company-location)) + ((elisp--form-quoted-p beg) + (list nil obarray + ;; Don't include all symbols (bug#16646). + :predicate (lambda (sym) + (or (boundp sym) + (fboundp sym) + (featurep sym) + (symbol-plist sym))) + :annotation-function + (lambda (str) (if (fboundp (intern-soft str)) " <f>")) + :company-doc-buffer #'elisp--company-doc-buffer + :company-docsig #'elisp--company-doc-string + :company-location #'elisp--company-location)) + (t + (list nil (completion-table-merge + elisp--local-variables-completion-table + (apply-partially #'completion-table-with-predicate + obarray + #'boundp + 'strict)) + :company-doc-buffer #'elisp--company-doc-buffer + :company-docsig #'elisp--company-doc-string + :company-location #'elisp--company-location))) + ;; Looks like a funcall position. Let's double check. + (save-excursion + (goto-char (1- beg)) + (let ((parent + (condition-case nil + (progn (up-list -1) (forward-char 1) + (let ((c (char-after))) + (if (eq c ?\() ?\( + (if (memq (char-syntax c) '(?w ?_)) + (read (current-buffer)))))) + (error nil)))) + (pcase parent + ;; FIXME: Rather than hardcode special cases here, + ;; we should use something like a symbol-property. + (`declare + (list t (mapcar (lambda (x) (symbol-name (car x))) + (delete-dups + ;; FIXME: We should include some + ;; docstring with each entry. + (append + macro-declarations-alist + defun-declarations-alist))))) + ((and (or `condition-case `condition-case-unless-debug) + (guard (save-excursion + (ignore-errors + (forward-sexp 2) + (< (point) beg))))) + (list t obarray + :predicate (lambda (sym) (get sym 'error-conditions)))) + ((and ?\( + (guard (save-excursion + (goto-char (1- beg)) + (up-list -1) + (forward-symbol -1) + (looking-at "\\_<let\\*?\\_>")))) + (list t obarray + :predicate #'boundp + :company-doc-buffer #'elisp--company-doc-buffer + :company-docsig #'elisp--company-doc-string + :company-location #'elisp--company-location)) + (_ (list nil obarray + :predicate #'fboundp + :company-doc-buffer #'elisp--company-doc-buffer + :company-docsig #'elisp--company-doc-string + :company-location #'elisp--company-location + )))))))) + (nconc (list beg end) + (if (null (car table-etc)) + (cdr table-etc) + (cons + (if (memq (char-syntax (or (char-after end) ?\s)) + '(?\s ?>)) + (cadr table-etc) + (apply-partially 'completion-table-with-terminator + " " (cadr table-etc))) + (cddr table-etc))))))))) + +(define-obsolete-function-alias + 'lisp-completion-at-point 'elisp-completion-at-point "25.1") + +;;; Xref backend + +(declare-function xref-make-elisp-location "xref" (symbol type file)) +(declare-function xref-make-bogus-location "xref" (message)) +(declare-function xref-make "xref" (description location)) + +(defun elisp-xref-find (action id) + (require 'find-func) + (pcase action + (`definitions + (let ((sym (intern-soft id))) + (when sym + (elisp--xref-find-definitions sym)))) + (`apropos + (elisp--xref-find-apropos id)))) + +(defun elisp--xref-identifier-file (type sym) + (pcase type + (`defun (when (fboundp sym) + (find-function-library sym))) + (`defvar (when (boundp sym) + (or (symbol-file sym 'defvar) + (help-C-file-name sym 'var)))) + (`feature (when (featurep sym) + (ignore-errors + (find-library-name (symbol-name sym))))) + (`defface (when (facep sym) + (symbol-file sym 'defface))))) + +(defun elisp--xref-find-definitions (symbol) + (save-excursion + (let (lst) + (dolist (type '(feature defface defvar defun)) + (let ((loc + (condition-case err + (let ((file (elisp--xref-identifier-file type symbol))) + (when file + (when (string-match-p "\\.elc\\'" file) + (setq file (substring file 0 -1))) + (xref-make-elisp-location symbol type file))) + (error + (xref-make-bogus-location (error-message-string err)))))) + (when loc + (push + (xref-make (format "(%s %s)" type symbol) + loc) + lst)))) + lst))) + +(defun elisp--xref-find-apropos (regexp) + (apply #'nconc + (let (lst) + (dolist (sym (apropos-internal regexp)) + (push (elisp--xref-find-definitions sym) lst)) + (nreverse lst)))) + +(defvar elisp--xref-identifier-completion-table + (apply-partially #'completion-table-with-predicate + obarray + (lambda (sym) + (or (boundp sym) + (fboundp sym) + (featurep sym) + (facep sym))) + 'strict)) + +(defun elisp--xref-identifier-completion-table () + elisp--xref-identifier-completion-table) + +;;; Elisp Interaction mode + +(defvar lisp-interaction-mode-map + (let ((map (make-sparse-keymap)) + (menu-map (make-sparse-keymap "Lisp-Interaction"))) + (set-keymap-parent map lisp-mode-shared-map) + (define-key map "\e\C-x" 'eval-defun) + (define-key map "\e\C-q" 'indent-pp-sexp) + (define-key map "\e\t" 'completion-at-point) + (define-key map "\n" 'eval-print-last-sexp) + (bindings--define-key map [menu-bar lisp-interaction] + (cons "Lisp-Interaction" menu-map)) + (bindings--define-key menu-map [eval-defun] + '(menu-item "Evaluate Defun" eval-defun + :help "Evaluate the top-level form containing point, or after point")) + (bindings--define-key menu-map [eval-print-last-sexp] + '(menu-item "Evaluate and Print" eval-print-last-sexp + :help "Evaluate sexp before point; print value into current buffer")) + (bindings--define-key menu-map [edebug-defun-lisp-interaction] + '(menu-item "Instrument Function for Debugging" edebug-defun + :help "Evaluate the top level form point is in, stepping through with Edebug" + :keys "C-u C-M-x")) + (bindings--define-key menu-map [indent-pp-sexp] + '(menu-item "Indent or Pretty-Print" indent-pp-sexp + :help "Indent each line of the list starting just after point, or prettyprint it")) + (bindings--define-key menu-map [complete-symbol] + '(menu-item "Complete Lisp Symbol" completion-at-point + :help "Perform completion on Lisp symbol preceding point")) + map) + "Keymap for Lisp Interaction mode. +All commands in `lisp-mode-shared-map' are inherited by this map.") + +(define-derived-mode lisp-interaction-mode emacs-lisp-mode "Lisp Interaction" + "Major mode for typing and evaluating Lisp forms. +Like Lisp mode except that \\[eval-print-last-sexp] evals the Lisp expression +before point, and prints its value into the buffer, advancing point. +Note that printing is controlled by `eval-expression-print-length' +and `eval-expression-print-level'. + +Commands: +Delete converts tabs to spaces as it moves back. +Paragraphs are separated only by blank lines. +Semicolons start comments. + +\\{lisp-interaction-mode-map}" + :abbrev-table nil) + +;;; Emacs Lisp Byte-Code mode + +(eval-and-compile + (defconst emacs-list-byte-code-comment-re + (concat "\\(#\\)@\\([0-9]+\\) " + ;; Make sure it's a docstring and not a lazy-loaded byte-code. + "\\(?:[^(]\\|([^\"]\\)"))) + +(defun elisp--byte-code-comment (end &optional _point) + "Try to syntactically mark the #@NNN ....^_ docstrings in byte-code files." + (let ((ppss (syntax-ppss))) + (when (and (nth 4 ppss) + (eq (char-after (nth 8 ppss)) ?#)) + (let* ((n (save-excursion + (goto-char (nth 8 ppss)) + (when (looking-at emacs-list-byte-code-comment-re) + (string-to-number (match-string 2))))) + ;; `maxdiff' tries to make sure the loop below terminates. + (maxdiff n)) + (when n + (let* ((bchar (match-end 2)) + (b (position-bytes bchar))) + (goto-char (+ b n)) + (while (let ((diff (- (position-bytes (point)) b n))) + (unless (zerop diff) + (when (> diff maxdiff) (setq diff maxdiff)) + (forward-char (- diff)) + (setq maxdiff (if (> diff 0) diff + (max (1- maxdiff) 1))) + t)))) + (if (<= (point) end) + (put-text-property (1- (point)) (point) + 'syntax-table + (string-to-syntax "> b")) + (goto-char end))))))) + +(defun elisp-byte-code-syntax-propertize (start end) + (elisp--byte-code-comment end (point)) + (funcall + (syntax-propertize-rules + (emacs-list-byte-code-comment-re + (1 (prog1 "< b" (elisp--byte-code-comment end (point)))))) + start end)) + +;;;###autoload +(add-to-list 'auto-mode-alist '("\\.elc\\'" . elisp-byte-code-mode)) +;;;###autoload +(define-derived-mode elisp-byte-code-mode emacs-lisp-mode + "Elisp-Byte-Code" + "Major mode for *.elc files." + ;; TODO: Add way to disassemble byte-code under point. + (setq-local open-paren-in-column-0-is-defun-start nil) + (setq-local syntax-propertize-function + #'elisp-byte-code-syntax-propertize)) + + +;;; Globally accessible functionality + +(defun eval-print-last-sexp (&optional eval-last-sexp-arg-internal) + "Evaluate sexp before point; print value into current buffer. + +Normally, this function truncates long output according to the value +of the variables `eval-expression-print-length' and +`eval-expression-print-level'. With a prefix argument of zero, +however, there is no such truncation. Such a prefix argument +also causes integers to be printed in several additional formats +\(octal, hexadecimal, and character). + +If `eval-expression-debug-on-error' is non-nil, which is the default, +this command arranges for all errors to enter the debugger." + (interactive "P") + (let ((standard-output (current-buffer))) + (terpri) + (eval-last-sexp (or eval-last-sexp-arg-internal t)) + (terpri))) + + +(defun last-sexp-setup-props (beg end value alt1 alt2) + "Set up text properties for the output of `elisp--eval-last-sexp'. +BEG and END are the start and end of the output in current-buffer. +VALUE is the Lisp value printed, ALT1 and ALT2 are strings for the +alternative printed representations that can be displayed." + (let ((map (make-sparse-keymap))) + (define-key map "\C-m" 'elisp-last-sexp-toggle-display) + (define-key map [down-mouse-2] 'mouse-set-point) + (define-key map [mouse-2] 'elisp-last-sexp-toggle-display) + (add-text-properties + beg end + `(printed-value (,value ,alt1 ,alt2) + mouse-face highlight + keymap ,map + help-echo "RET, mouse-2: toggle abbreviated display" + rear-nonsticky (mouse-face keymap help-echo + printed-value))))) + + +(defun elisp-last-sexp-toggle-display (&optional _arg) + "Toggle between abbreviated and unabbreviated printed representations." + (interactive "P") + (save-restriction + (widen) + (let ((value (get-text-property (point) 'printed-value))) + (when value + (let ((beg (or (previous-single-property-change (min (point-max) (1+ (point))) + 'printed-value) + (point))) + (end (or (next-single-char-property-change (point) 'printed-value) (point))) + (standard-output (current-buffer)) + (point (point))) + (delete-region beg end) + (insert (nth 1 value)) + (or (= beg point) + (setq point (1- (point)))) + (last-sexp-setup-props beg (point) + (nth 0 value) + (nth 2 value) + (nth 1 value)) + (goto-char (min (point-max) point))))))) + +(defun prin1-char (char) ;FIXME: Move it, e.g. to simple.el. + "Return a string representing CHAR as a character rather than as an integer. +If CHAR is not a character, return nil." + (and (integerp char) + (eventp char) + (let ((c (event-basic-type char)) + (mods (event-modifiers char)) + string) + ;; Prevent ?A from turning into ?\S-a. + (if (and (memq 'shift mods) + (zerop (logand char ?\S-\^@)) + (not (let ((case-fold-search nil)) + (char-equal c (upcase c))))) + (setq c (upcase c) mods nil)) + ;; What string are we considering using? + (condition-case nil + (setq string + (concat + "?" + (mapconcat + (lambda (modif) + (cond ((eq modif 'super) "\\s-") + (t (string ?\\ (upcase (aref (symbol-name modif) 0)) ?-)))) + mods "") + (cond + ((memq c '(?\; ?\( ?\) ?\{ ?\} ?\[ ?\] ?\" ?\' ?\\)) (string ?\\ c)) + ((eq c 127) "\\C-?") + (t + (string c))))) + (error nil)) + ;; Verify the string reads a CHAR, not to some other character. + ;; If it doesn't, return nil instead. + (and string + (= (car (read-from-string string)) char) + string)))) + +(defun elisp--preceding-sexp () + "Return sexp before the point." + (let ((opoint (point)) + ignore-quotes + expr) + (save-excursion + (with-syntax-table emacs-lisp-mode-syntax-table + ;; If this sexp appears to be enclosed in `...' + ;; then ignore the surrounding quotes. + (setq ignore-quotes + (or (eq (following-char) ?\') + (eq (preceding-char) ?\'))) + (forward-sexp -1) + ;; If we were after `?\e' (or similar case), + ;; use the whole thing, not just the `e'. + (when (eq (preceding-char) ?\\) + (forward-char -1) + (when (eq (preceding-char) ??) + (forward-char -1))) + + ;; Skip over hash table read syntax. + (and (> (point) (1+ (point-min))) + (looking-back "#s" (- (point) 2)) + (forward-char -2)) + + ;; Skip over `#N='s. + (when (eq (preceding-char) ?=) + (let (labeled-p) + (save-excursion + (skip-chars-backward "0-9#=") + (setq labeled-p (looking-at "\\(#[0-9]+=\\)+"))) + (when labeled-p + (forward-sexp -1)))) + + (save-restriction + (if (and ignore-quotes (eq (following-char) ?`)) + ;; vladimir@cs.ualberta.ca 30-Jul-1997: Skip ` in `variable' so + ;; that the value is returned, not the name. + (forward-char)) + (when (looking-at ",@?") (goto-char (match-end 0))) + (narrow-to-region (point-min) opoint) + (setq expr (read (current-buffer))) + ;; If it's an (interactive ...) form, it's more useful to show how an + ;; interactive call would use it. + ;; FIXME: Is it really the right place for this? + (when (eq (car-safe expr) 'interactive) + (setq expr + `(call-interactively + (lambda (&rest args) ,expr args)))) + expr))))) +(define-obsolete-function-alias 'preceding-sexp 'elisp--preceding-sexp "25.1") + +(defun elisp--eval-last-sexp (eval-last-sexp-arg-internal) + "Evaluate sexp before point; print value in the echo area. +With argument, print output into current buffer. +With a zero prefix arg, print output with no limit on the length +and level of lists, and include additional formats for integers +\(octal, hexadecimal, and character)." + (let ((standard-output (if eval-last-sexp-arg-internal (current-buffer) t))) + ;; Setup the lexical environment if lexical-binding is enabled. + (elisp--eval-last-sexp-print-value + (eval (eval-sexp-add-defvars (elisp--preceding-sexp)) lexical-binding) + eval-last-sexp-arg-internal))) + + +(defun elisp--eval-last-sexp-print-value (value &optional eval-last-sexp-arg-internal) + (let ((unabbreviated (let ((print-length nil) (print-level nil)) + (prin1-to-string value))) + (print-length (and (not (zerop (prefix-numeric-value + eval-last-sexp-arg-internal))) + eval-expression-print-length)) + (print-level (and (not (zerop (prefix-numeric-value + eval-last-sexp-arg-internal))) + eval-expression-print-level)) + (beg (point)) + end) + (prog1 + (prin1 value) + (let ((str (eval-expression-print-format value))) + (if str (princ str))) + (setq end (point)) + (when (and (bufferp standard-output) + (or (not (null print-length)) + (not (null print-level))) + (not (string= unabbreviated + (buffer-substring-no-properties beg end)))) + (last-sexp-setup-props beg end value + unabbreviated + (buffer-substring-no-properties beg end)) + )))) + + +(defvar elisp--eval-last-sexp-fake-value (make-symbol "t")) + +(defun eval-sexp-add-defvars (exp &optional pos) + "Prepend EXP with all the `defvar's that precede it in the buffer. +POS specifies the starting position where EXP was found and defaults to point." + (setq exp (macroexpand-all exp)) ;Eager macro-expansion. + (if (not lexical-binding) + exp + (save-excursion + (unless pos (setq pos (point))) + (let ((vars ())) + (goto-char (point-min)) + (while (re-search-forward + "(def\\(?:var\\|const\\|custom\\)[ \t\n]+\\([^; '()\n\t]+\\)" + pos t) + (let ((var (intern (match-string 1)))) + (and (not (special-variable-p var)) + (save-excursion + (zerop (car (syntax-ppss (match-beginning 0))))) + (push var vars)))) + `(progn ,@(mapcar (lambda (v) `(defvar ,v)) vars) ,exp))))) + +(defun eval-last-sexp (eval-last-sexp-arg-internal) + "Evaluate sexp before point; print value in the echo area. +Interactively, with prefix argument, print output into current buffer. + +Normally, this function truncates long output according to the value +of the variables `eval-expression-print-length' and +`eval-expression-print-level'. With a prefix argument of zero, +however, there is no such truncation. Such a prefix argument +also causes integers to be printed in several additional formats +\(octal, hexadecimal, and character). + +If `eval-expression-debug-on-error' is non-nil, which is the default, +this command arranges for all errors to enter the debugger." + (interactive "P") + (if (null eval-expression-debug-on-error) + (elisp--eval-last-sexp eval-last-sexp-arg-internal) + (let ((value + (let ((debug-on-error elisp--eval-last-sexp-fake-value)) + (cons (elisp--eval-last-sexp eval-last-sexp-arg-internal) + debug-on-error)))) + (unless (eq (cdr value) elisp--eval-last-sexp-fake-value) + (setq debug-on-error (cdr value))) + (car value)))) + +(defun elisp--eval-defun-1 (form) + "Treat some expressions specially. +Reset the `defvar' and `defcustom' variables to the initial value. +\(For `defcustom', use the :set function if there is one.) +Reinitialize the face according to the `defface' specification." + ;; The code in edebug-defun should be consistent with this, but not + ;; the same, since this gets a macroexpanded form. + (cond ((not (listp form)) + form) + ((and (eq (car form) 'defvar) + (cdr-safe (cdr-safe form)) + (boundp (cadr form))) + ;; Force variable to be re-set. + `(progn (defvar ,(nth 1 form) nil ,@(nthcdr 3 form)) + (setq-default ,(nth 1 form) ,(nth 2 form)))) + ;; `defcustom' is now macroexpanded to + ;; `custom-declare-variable' with a quoted value arg. + ((and (eq (car form) 'custom-declare-variable) + (default-boundp (eval (nth 1 form) lexical-binding))) + ;; Force variable to be bound, using :set function if specified. + (let ((setfunc (memq :set form))) + (when setfunc + (setq setfunc (car-safe (cdr-safe setfunc))) + (or (functionp setfunc) (setq setfunc nil))) + (funcall (or setfunc 'set-default) + (eval (nth 1 form) lexical-binding) + ;; The second arg is an expression that evaluates to + ;; an expression. The second evaluation is the one + ;; normally performed not by normal execution but by + ;; custom-initialize-set (for example), which does not + ;; use lexical-binding. + (eval (eval (nth 2 form) lexical-binding)))) + form) + ;; `defface' is macroexpanded to `custom-declare-face'. + ((eq (car form) 'custom-declare-face) + ;; Reset the face. + (let ((face-symbol (eval (nth 1 form) lexical-binding))) + (setq face-new-frame-defaults + (assq-delete-all face-symbol face-new-frame-defaults)) + (put face-symbol 'face-defface-spec nil) + (put face-symbol 'face-override-spec nil)) + form) + ((eq (car form) 'progn) + (cons 'progn (mapcar #'elisp--eval-defun-1 (cdr form)))) + (t form))) + +(defun elisp--eval-defun () + "Evaluate defun that point is in or before. +The value is displayed in the echo area. +If the current defun is actually a call to `defvar', +then reset the variable using the initial value expression +even if the variable already has some other value. +\(Normally `defvar' does not change the variable's value +if it already has a value.\) + +Return the result of evaluation." + ;; FIXME: the print-length/level bindings should only be applied while + ;; printing, not while evaluating. + (let ((debug-on-error eval-expression-debug-on-error) + (print-length eval-expression-print-length) + (print-level eval-expression-print-level)) + (save-excursion + ;; Arrange for eval-region to "read" the (possibly) altered form. + ;; eval-region handles recording which file defines a function or + ;; variable. + (let ((standard-output t) + beg end form) + ;; Read the form from the buffer, and record where it ends. + (save-excursion + (end-of-defun) + (beginning-of-defun) + (setq beg (point)) + (setq form (read (current-buffer))) + (setq end (point))) + ;; Alter the form if necessary. + (let ((form (eval-sexp-add-defvars + (elisp--eval-defun-1 (macroexpand form))))) + (eval-region beg end standard-output + (lambda (_ignore) + ;; Skipping to the end of the specified region + ;; will make eval-region return. + (goto-char end) + form)))))) + (let ((str (eval-expression-print-format (car values)))) + (if str (princ str))) + ;; The result of evaluation has been put onto VALUES. So return it. + (car values)) + +(defun eval-defun (edebug-it) + "Evaluate the top-level form containing point, or after point. + +If the current defun is actually a call to `defvar' or `defcustom', +evaluating it this way resets the variable using its initial value +expression (using the defcustom's :set function if there is one), even +if the variable already has some other value. \(Normally `defvar' and +`defcustom' do not alter the value if there already is one.) In an +analogous way, evaluating a `defface' overrides any customizations of +the face, so that it becomes defined exactly as the `defface' expression +says. + +If `eval-expression-debug-on-error' is non-nil, which is the default, +this command arranges for all errors to enter the debugger. + +With a prefix argument, instrument the code for Edebug. + +If acting on a `defun' for FUNCTION, and the function was +instrumented, `Edebug: FUNCTION' is printed in the echo area. If not +instrumented, just FUNCTION is printed. + +If not acting on a `defun', the result of evaluation is displayed in +the echo area. This display is controlled by the variables +`eval-expression-print-length' and `eval-expression-print-level', +which see." + (interactive "P") + (cond (edebug-it + (require 'edebug) + (eval-defun (not edebug-all-defs))) + (t + (if (null eval-expression-debug-on-error) + (elisp--eval-defun) + (let (new-value value) + (let ((debug-on-error elisp--eval-last-sexp-fake-value)) + (setq value (elisp--eval-defun)) + (setq new-value debug-on-error)) + (unless (eq elisp--eval-last-sexp-fake-value new-value) + (setq debug-on-error new-value)) + value))))) + +;;; ElDoc Support + +(defvar elisp--eldoc-last-data (make-vector 3 nil) + "Bookkeeping; elements are as follows: + 0 - contains the last symbol read from the buffer. + 1 - contains the string last displayed in the echo area for variables, + or argument string for functions. + 2 - 'function if function args, 'variable if variable documentation.") + +(defun elisp-eldoc-documentation-function () + "`eldoc-documentation-function' (which see) for Emacs Lisp." + (let ((current-symbol (elisp--current-symbol)) + (current-fnsym (elisp--fnsym-in-current-sexp))) + (cond ((null current-fnsym) + nil) + ((eq current-symbol (car current-fnsym)) + (or (apply #'elisp--get-fnsym-args-string current-fnsym) + (elisp--get-var-docstring current-symbol))) + (t + (or (elisp--get-var-docstring current-symbol) + (apply #'elisp--get-fnsym-args-string current-fnsym)))))) + +(defun elisp--get-fnsym-args-string (sym &optional index) + "Return a string containing the parameter list of the function SYM. +If SYM is a subr and no arglist is obtainable from the docstring +or elsewhere, return a 1-line docstring." + (let ((argstring + (cond + ((not (and sym (symbolp sym) (fboundp sym))) nil) + ((and (eq sym (aref elisp--eldoc-last-data 0)) + (eq 'function (aref elisp--eldoc-last-data 2))) + (aref elisp--eldoc-last-data 1)) + (t + (let* ((advertised (gethash (indirect-function sym) + advertised-signature-table t)) + doc + (args + (cond + ((listp advertised) advertised) + ((setq doc (help-split-fundoc (documentation sym t) sym)) + (car doc)) + (t (help-function-arglist sym))))) + ;; Stringify, and store before highlighting, downcasing, etc. + ;; FIXME should truncate before storing. + (elisp--last-data-store sym (elisp--function-argstring args) + 'function)))))) + ;; Highlight, truncate. + (if argstring + (elisp--highlight-function-argument sym argstring index)))) + +(defun elisp--highlight-function-argument (sym args index) + "Highlight argument INDEX in ARGS list for function SYM. +In the absence of INDEX, just call `elisp--docstring-format-sym-doc'." + ;; FIXME: This should probably work on the list representation of `args' + ;; rather than its string representation. + ;; FIXME: This function is much too long, we need to split it up! + (let ((start nil) + (end 0) + (argument-face 'eldoc-highlight-function-argument) + (args-lst (mapcar (lambda (x) + (replace-regexp-in-string + "\\`[(]\\|[)]\\'" "" x)) + (split-string args)))) + ;; Find the current argument in the argument string. We need to + ;; handle `&rest' and informal `...' properly. + ;; + ;; FIXME: What to do with optional arguments, like in + ;; (defun NAME ARGLIST [DOCSTRING] BODY...) case? + ;; The problem is there is no robust way to determine if + ;; the current argument is indeed a docstring. + + ;; When `&key' is used finding position based on `index' + ;; would be wrong, so find the arg at point and determine + ;; position in ARGS based on this current arg. + (when (string-match "&key" args) + (let* (case-fold-search + key-have-value + (sym-name (symbol-name sym)) + (cur-w (current-word)) + (args-lst-ak (cdr (member "&key" args-lst))) + (limit (save-excursion + (when (re-search-backward sym-name nil t) + (match-end 0)))) + (cur-a (if (and cur-w (string-match ":\\([^ ()]*\\)" cur-w)) + (substring cur-w 1) + (save-excursion + (let (split) + (when (re-search-backward ":\\([^()\n]*\\)" limit t) + (setq split (split-string (match-string 1) " " t)) + (prog1 (car split) + (when (cdr split) + (setq key-have-value t)))))))) + ;; If `cur-a' is not one of `args-lst-ak' + ;; assume user is entering an unknown key + ;; referenced in last position in signature. + (other-key-arg (and (stringp cur-a) + args-lst-ak + (not (member (upcase cur-a) args-lst-ak)) + (upcase (car (last args-lst-ak)))))) + (unless (string= cur-w sym-name) + ;; The last keyword have already a value + ;; i.e :foo a b and cursor is at b. + ;; If signature have also `&rest' + ;; (assume it is after the `&key' section) + ;; go to the arg after `&rest'. + (if (and key-have-value + (save-excursion + (not (re-search-forward ":.*" (point-at-eol) t))) + (string-match "&rest \\([^ ()]*\\)" args)) + (setq index nil ; Skip next block based on positional args. + start (match-beginning 1) + end (match-end 1)) + ;; If `cur-a' is nil probably cursor is on a positional arg + ;; before `&key', in this case, exit this block and determine + ;; position with `index'. + (when (and cur-a ; A keyword arg (dot removed) or nil. + (or (string-match + (concat "\\_<" (upcase cur-a) "\\_>") args) + (string-match + (concat "\\_<" other-key-arg "\\_>") args))) + (setq index nil ; Skip next block based on positional args. + start (match-beginning 0) + end (match-end 0))))))) + ;; Handle now positional arguments. + (while (and index (>= index 1)) + (if (string-match "[^ ()]+" args end) + (progn + (setq start (match-beginning 0) + end (match-end 0)) + (let ((argument (match-string 0 args))) + (cond ((string= argument "&rest") + ;; All the rest arguments are the same. + (setq index 1)) + ((string= argument "&optional")) ; Skip. + ((string= argument "&allow-other-keys")) ; Skip. + ;; Back to index 0 in ARG1 ARG2 ARG2 ARG3 etc... + ;; like in `setq'. + ((or (and (string-match-p "\\.\\.\\.$" argument) + (string= argument (car (last args-lst)))) + (and (string-match-p "\\.\\.\\.$" + (substring args 1 (1- (length args)))) + (= (length (remove "..." args-lst)) 2) + (> index 1) (eq (logand index 1) 1))) + (setq index 0)) + (t + (setq index (1- index)))))) + (setq end (length args) + start (1- end) + argument-face 'font-lock-warning-face + index 0))) + (let ((doc args)) + (when start + (setq doc (copy-sequence args)) + (add-text-properties start end (list 'face argument-face) doc)) + (setq doc (elisp--docstring-format-sym-doc + sym doc (if (functionp sym) 'font-lock-function-name-face + 'font-lock-keyword-face))) + doc))) + +;; Return a string containing a brief (one-line) documentation string for +;; the variable. +(defun elisp--get-var-docstring (sym) + (cond ((not sym) nil) + ((and (eq sym (aref elisp--eldoc-last-data 0)) + (eq 'variable (aref elisp--eldoc-last-data 2))) + (aref elisp--eldoc-last-data 1)) + (t + (let ((doc (documentation-property sym 'variable-documentation t))) + (when doc + (let ((doc (elisp--docstring-format-sym-doc + sym (elisp--docstring-first-line doc) + 'font-lock-variable-name-face))) + (elisp--last-data-store sym doc 'variable))))))) + +(defun elisp--last-data-store (symbol doc type) + (aset elisp--eldoc-last-data 0 symbol) + (aset elisp--eldoc-last-data 1 doc) + (aset elisp--eldoc-last-data 2 type) + doc) + +;; Note that any leading `*' in the docstring (which indicates the variable +;; is a user option) is removed. +(defun elisp--docstring-first-line (doc) + (and (stringp doc) + (substitute-command-keys + (save-match-data + ;; Don't use "^" in the regexp below since it may match + ;; anywhere in the doc-string. + (let ((start (if (string-match "\\`\\*" doc) (match-end 0) 0))) + (cond ((string-match "\n" doc) + (substring doc start (match-beginning 0))) + ((zerop start) doc) + (t (substring doc start)))))))) + +(defvar eldoc-echo-area-use-multiline-p) + +;; If the entire line cannot fit in the echo area, the symbol name may be +;; truncated or eliminated entirely from the output to make room for the +;; description. +(defun elisp--docstring-format-sym-doc (sym doc face) + (save-match-data + (let* ((name (symbol-name sym)) + (ea-multi eldoc-echo-area-use-multiline-p) + ;; Subtract 1 from window width since emacs will not write + ;; any chars to the last column, or in later versions, will + ;; cause a wraparound and resize of the echo area. + (ea-width (1- (window-width (minibuffer-window)))) + (strip (- (+ (length name) (length ": ") (length doc)) ea-width))) + (cond ((or (<= strip 0) + (eq ea-multi t) + (and ea-multi (> (length doc) ea-width))) + (format "%s: %s" (propertize name 'face face) doc)) + ((> (length doc) ea-width) + (substring (format "%s" doc) 0 ea-width)) + ((>= strip (length name)) + (format "%s" doc)) + (t + ;; Show the end of the partial symbol name, rather + ;; than the beginning, since the former is more likely + ;; to be unique given package namespace conventions. + (setq name (substring name strip)) + (format "%s: %s" (propertize name 'face face) doc)))))) + + +;; Return a list of current function name and argument index. +(defun elisp--fnsym-in-current-sexp () + (save-excursion + (let ((argument-index (1- (elisp--beginning-of-sexp)))) + ;; If we are at the beginning of function name, this will be -1. + (when (< argument-index 0) + (setq argument-index 0)) + ;; Don't do anything if current word is inside a string. + (if (= (or (char-after (1- (point))) 0) ?\") + nil + (list (elisp--current-symbol) argument-index))))) + +;; Move to the beginning of current sexp. Return the number of nested +;; sexp the point was over or after. +(defun elisp--beginning-of-sexp () + (let ((parse-sexp-ignore-comments t) + (num-skipped-sexps 0)) + (condition-case _ + (progn + ;; First account for the case the point is directly over a + ;; beginning of a nested sexp. + (condition-case _ + (let ((p (point))) + (forward-sexp -1) + (forward-sexp 1) + (when (< (point) p) + (setq num-skipped-sexps 1))) + (error)) + (while + (let ((p (point))) + (forward-sexp -1) + (when (< (point) p) + (setq num-skipped-sexps (1+ num-skipped-sexps)))))) + (error)) + num-skipped-sexps)) + +;; returns nil unless current word is an interned symbol. +(defun elisp--current-symbol () + (let ((c (char-after (point)))) + (and c + (memq (char-syntax c) '(?w ?_)) + (intern-soft (current-word))))) + +(defun elisp--function-argstring (arglist) + "Return ARGLIST as a string enclosed by (). +ARGLIST is either a string, or a list of strings or symbols." + (let ((str (cond ((stringp arglist) arglist) + ((not (listp arglist)) nil) + (t (format "%S" (help-make-usage 'toto arglist)))))) + (if (and str (string-match "\\`([^ )]+ ?" str)) + (replace-match "(" t t str) + str))) + +(provide 'elisp-mode) +;;; elisp-mode.el ends here |