A bunch of changes

elisp/latex-help.el

@@ -0,0 +1,273 @@
+;;; latex-help.el --- Lookup LaTeX symbols  -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; This is inspired by an old package (originally from the 90s!!) called
+;; ltx-help.el.  This package used to be called latex-help.el too, but it seems
+;; to have had its name changed sometime around 2010.  This package aims for
+;; similar functionality, but using more up to date and convention-conforming
+;; Elisp.  For example, the original package still assumes that you may not have
+;; `add-hook' or `buffer-substring-no-properties'.  Only very old versions of
+;; Emacs are missing these, so almost everyone has them nowadays.
+
+;;; Code:
+(require 'info)
+
+(defcustom latex-help-info-manual "latex2e"
+  "The name of the info manual to use when looking up latex commands."
+  :group 'latex-help
+  :type '(choice
+	      (string :tag "English" "latex2e")
+	      (string :tag "French" "latex2e-fr")
+	      (string :tag "Spanish" "latex2e-es")))
+
+(defcustom latex-help-buffer-name "*latex-help*"
+  "The name of the info buffer to use when showing LaTeX documentation."
+  :group 'latex-help
+  :type 'string)
+
+(defun latex-help--run-index-search (regexp)
+  "Search the LaTeX info pages index for REGEXP.
+This returns a list of cache entries suitable for use in
+`latex-help--commands-cache'."
+  (with-temp-buffer
+    (Info-mode)
+    (Info-find-node latex-help-info-manual "Index" nil t)
+    (let ((found))
+      (while (re-search-forward regexp nil t)
+        (let ((match (match-string-no-properties 1))
+              (node (match-string-no-properties 2)))
+          (if (equal (caar found) match)
+              (push (cons node (pos-bol)) (cdar found))
+            (push (list match (cons node (pos-bol))) found))))
+      found)))
+
+(defvar latex-help--commands-cache nil
+  "Cahce of discovered of LaTeX commands.
+These do NOT have a leading '\\'.")
+
+(defun latex-help--discover-commands ()
+  "Discover LaTeX commands.
+This is done by parsing the index for `latex-help-info-manual'."
+  (let ((found (latex-help--run-index-search
+                (rx (and bol "* \\"
+                         (group (or
+                                 ","
+                                 (+ (not (any " " "{" ",")))))
+                         (*? any) ":" (+ " ")
+                         (group (+? any)) ".")))))
+    (push (list "(SPACE)" "\\(SPACE)") found)
+    (when-let (entry (assoc "(...\\)" found))
+      (setq found (assoc-delete-all "(...\\)" found))
+      (push (cons "(" (cdr entry)) found)
+      (push (cons ")" (cdr entry)) found))
+    (when-let (entry (assoc "[...\\]" found))
+      (setq found (assoc-delete-all "[...\\]" found))
+      (push (cons "[" (cdr entry)) found)
+      (push (cons "]" (cdr entry)) found))
+    found))
+
+(defvar latex-help--package-cache nil
+  "Cache of discovered LaTeX packages.")
+
+(defun latex-help--discover-packages ()
+  "Discover LaTeX packages.
+This is done by parsing the index for `latex-help-info-manual'."
+  (latex-help--run-index-search (rx (and bol "* package, "
+                                         (group (+? any))
+                                         (any " " ":")
+                                         (+? any) (+ " ")
+                                         (group (+? any))
+                                         "."))))
+
+(defvar latex-help--environment-cache nil
+  "Cache of discovered LaTeX environments.")
+
+(defun latex-help--discover-environments ()
+  "Discover LaTeX environments.
+This is done by parsing the index for `latex-help-info-manual'."
+  (latex-help--run-index-search (rx (and bol "* environment, "
+                                         (group (+? any))
+                                         (any " " ":" "-")
+                                         (+? any) (+ " ")
+                                         (group (+? any))
+                                         "."))))
+
+(defvar latex-help--class-cache nil
+  "Cache of discovered LaTeX document classes.")
+
+(defun latex-help--discover-classes ()
+  "Discover LaTeX document classes.
+This is done by parsing the index for `latex-help-info-manual'."
+  (latex-help--run-index-search (rx (and bol "* "
+                                         (group (+ (not (any "," " "))))
+                                         " class:" (+ " ")
+                                         (group (+ (not ".")))))))
+
+(defun latex-help--goto-entry (entry)
+  "Open the info page for ENTRY, a cache entry."
+  (let ((buffer (get-buffer-create latex-help-buffer-name)))
+    (with-current-buffer buffer
+      (unless (derived-mode-p 'Info-mode)
+        (Info-mode))
+      (Info-find-node latex-help-info-manual "Index" nil t)
+      (goto-char (cdr entry))
+      (Info-follow-nearest-node))
+    (pop-to-buffer buffer)))
+
+(defvar latex-help--caches-initialized-p nil
+  "Non-nil if the latex-help caches have been initialized.")
+
+(defun latex-help--get-cache-for-type (type)
+  "Lookup the cache for TYPE.
+If the caches are not yet initialized, do that first."
+  (unless latex-help--caches-initialized-p
+    (setq latex-help--commands-cache (latex-help--discover-commands)
+          latex-help--package-cache (latex-help--discover-packages)
+          latex-help--environment-cache (latex-help--discover-environments)
+          latex-help--class-cache (latex-help--discover-classes)
+          latex-help--caches-initialized-p t))
+  (cond
+   ((eq type 'command)
+    latex-help--commands-cache)
+   ((eq type 'package)
+    latex-help--package-cache)
+   ((eq type 'environment)
+    latex-help--environment-cache)
+   ((eq type 'class)
+    latex-help--class-cache)))
+
+(defun latex-help--history nil
+  "History list for `latex-help--maybe-prompt-entry'.")
+
+(defun latex-help--maybe-prompt-entry (name type &optional default)
+  "Lookup and prompt the user for the node of NAME.
+The lookup is performed in the correct cache for TYPE.  If there is only one
+node associated with NAME, return its entry.  Otherwise, ask the user which node
+they want to use.
+
+If DEFAULT is non-nil, use that instead of prompting.  If it does not exist,
+return nil."
+  (when-let (entries (alist-get name (latex-help--get-cache-for-type type)
+                                nil nil 'equal))
+    (cond
+     (default
+      (assoc default entries))
+     ((length= entries 1)
+      (car entries))
+     (t
+      (let ((resp (completing-read "Select Node: " (mapcar 'car entries)
+                                   nil t nil)))
+        (assoc resp entries))))))
+
+(defun latex-help--get-thing-at-point ()
+  "Return a cons of the LaTeX thing at point and its type (as a symbol).
+If nothing is found, return nil.
+The following types are known:
+  - command
+  - package
+  - environment
+  - class
+
+The following are some examples:
+  - \\textbf{Hello World}                     -> \\='(\"textbf\" . command)
+  - \\begin{math} (on \"math\")               -> \\='(\"math\" . environment)
+  - \\begin{math} (on \"begin\")              -> \\='(\"begin\" . command)
+  - \\usepackage{amsmath} (on \"amsmath\")    -> \\='(\"amsmath\" . package)
+  - \\usepackage{amsmath} (on \"usepackage\") -> \\='(\"usepackage\" . command)"
+  (save-excursion
+    (let ((orig-point (point)))
+      (when (eq (char-after) ?\\)
+        (forward-char))
+      (when (and (search-backward "\\" nil t)
+                 (looking-at (rx "\\"
+                                 (group (+ (not (any " " "\n" "("
+                                                     "{" "[" "|"
+                                                     "}" "]" ")")))))))
+        (let ((cmd (match-string-no-properties 1)))
+          (if (> (match-end 1) orig-point)
+              (cons cmd 'command)
+            (goto-char orig-point)
+            (condition-case _
+                (progn
+                  (backward-up-list nil t t)
+                  (when (looking-at (rx "{" (group (+ (not (any "}" "\n"))))))
+                    (let ((thing (match-string-no-properties 1)))
+                      (cond
+                       ((equal cmd "usepackage")
+                        (cons thing 'package))
+                       ((or (equal cmd "begin")
+                            (equal cmd "end"))
+                        (cons thing 'environment))
+                       ((equal cmd "documentclass")
+                        (cons thing 'class))))))
+              ;; just return nil
+              ((or user-error scan-error)))))))))
+
+(defun latex-help--prompt-for (type)
+  "Prompt for a command, environment, etc. from TYPE.
+This returns the name of the thing that was prompted."
+  (let* ((cache (latex-help--get-cache-for-type type))
+         (tap (latex-help--get-thing-at-point))
+         (default (and (eq (cdr tap) type) (car tap))))
+    (unless (assoc default cache)
+      (setq default nil))
+    (completing-read (format "LaTeX %s%s: "
+                             (capitalize (symbol-name type))
+                             (if default
+                                 (format " (default %s)" default)
+                               ""))
+                     (latex-help--get-cache-for-type type)
+                     nil t nil 'latex-help--history
+                     default)))
+
+(defun latex-help-command (name &optional node)
+  "Lookup the LaTeX command NAME.
+Unless NODE is non-nil, if NAME is in more than one node, prompt the user for
+which to use.  If NODE is non-nil, use that instead."
+  (interactive (list (latex-help--prompt-for 'command)))
+  (when-let (entry (latex-help--maybe-prompt-entry name 'command node))
+    (latex-help--goto-entry entry)))
+
+(defun latex-help-environment (name &optional node)
+  "Lookup the LaTeX environment NAME.
+Unless NODE is non-nil, if NAME is in more than one node, prompt the user for
+which to use.  If NODE is non-nil, use that instead."
+  (interactive (list (latex-help--prompt-for 'environment)))
+  (when-let (entry (latex-help--maybe-prompt-entry name 'environment node))
+    (latex-help--goto-entry entry)))
+
+(defun latex-help-package (name &optional node)
+  "Lookup the LaTeX package NAME.
+Unless NODE is non-nil, if NAME is in more than one node, prompt the user for
+which to use.  If NODE is non-nil, use that instead."
+  (interactive (list (latex-help--prompt-for 'package)))
+  (when-let (entry (latex-help--maybe-prompt-entry name 'package node))
+    (latex-help--goto-entry entry)))
+
+(defun latex-help-class (name &optional node)
+  "Lookup the LaTeX document class NAME.
+Unless NODE is non-nil, if NAME is in more than one node, prompt the user for
+which to use.  If NODE is non-nil, use that instead."
+  (interactive (list (latex-help--prompt-for 'class)))
+  (when-let (entry (latex-help--maybe-prompt-entry name 'class node))
+    (latex-help--goto-entry entry)))
+
+(defun latex-help-at-point ()
+  "Try to lookup the LaTeX thing at point, whatever it may be.
+This will try to look up the command, package, document class, or environment at
+point.  If that thing at point is valid, it will open an info buffer to the
+documentation for that thing."
+  (interactive)
+  (if-let (thing (latex-help--get-thing-at-point))
+      (if-let (entry (latex-help--maybe-prompt-entry (car thing)
+                                                     (cdr thing)))
+          (latex-help--goto-entry entry)
+        (user-error "Unknown %s: \"%s\""
+                    (symbol-name (cdr thing))
+                    (if (eq (cdr thing) 'command)
+                        (concat "\\" (car thing))
+                      (car thing))))
+    (user-error "Nothing at point to look up")))
+
+(provide 'latex-help)
+;;; latex-help.el ends here

init.el

@@ -215,7 +215,8 @@ BUFFER can be a string or a buffer."
    ((stringp buffer)
     (not (string-prefix-p " " buffer)))
    ((bufferp buffer)
-    (my/buffer-visible-p (buffer-name buffer)))
+    (and (stringp (buffer-name buffer))
+         (my/buffer-visible-p (buffer-name buffer))))
    (t
     (signal 'wrong-type-argument `((or bufferp stringp) ,buffer)))))
 
@@ -378,7 +379,8 @@ directory. Otherwise, run `find-file' on that file."
   :hook (undo-tree-visualizer-mode . my/-undo-tree-visualizer-mode-setup)
   :config
   (defun my/-undo-tree-visualizer-mode-setup ()
-    (visual-line-mode -1))
+    (visual-line-mode -1)
+    (setq truncate-lines t))
   (global-undo-tree-mode))
 
 ;; evil
@@ -722,11 +724,21 @@ to `posframe-show' if the display is graphical."
   :init
   (defun my/flymake-show-diagnostic-at-point ()
     (interactive)
-    (if-let ((pos (point))
+    (when flymake-mode
-             (diag (and flymake-mode
+      (let* ((diag (get-char-property (point) 'flymake-diagnostic))
-                        (get-char-property pos 'flymake-diagnostic)))
+             (diag-msg (when diag
-             (message (flymake--diag-text diag)))
+                         (apply 'concat
-        (my/floating-tooltip " *flymake-error-posframe*" message))))
+                                (mapcar
+                                 (lambda (msg)
+                                   (concat "•" msg "\n"))
+                                 (split-string (flymake--diag-text diag)
+                                               "\n")))))
+             (jinx-msg (when (jinx--get-overlays (point) (1+ (point)))
+                         "•misspelled word\n")))
+        (unless (and (zerop (length diag-msg))
+                     (zerop (length jinx-msg)))
+          (my/floating-tooltip " *flymake-error-posframe*"
+                               (concat diag-msg jinx-msg)))))))
 
 ;; flycheck
 (use-package flycheck
@@ -740,12 +752,15 @@ to `posframe-show' if the display is graphical."
   (defun my/flycheck-show-diagnostic-at-point ()
     (interactive)
     (if-let ((flycheck-mode)
-             (errors (flycheck-overlay-errors-at (point)))
+             (message
-             (message (apply 'concat
+              (apply 'concat
-                             (mapcar
+                     (nconc (mapcar
                              (lambda (error)
                                (concat "•" (flycheck-error-message error) "\n"))
-                              errors))))
+                             (flycheck-overlay-errors-at (point)))
+                            (when (jinx--get-overlays (point) (1+ (point)))
+                              '("•misspelled word\n")))))
+             ((not (zerop (length message)))))
         (my/floating-tooltip " *flycheck-error-posframe*"
                              (substring message 0 (1- (length message)))))))
 (use-package consult-flycheck
@@ -1019,7 +1034,7 @@ When EXCLUDE-BRACES is non-nil, don't count the first and last brace of the
 entry as in the entry.  That is, if the point is on the first { or last } of the
 entry, return nil."
   (save-excursion
-    (when (and exclude-braces (= ?\} (char-after)))
+    (when (and exclude-braces (eq ?\} (char-after)))
       (forward-char))
     ;; go to top level and check if the character at point is {
     (let ((start-pos (point))
@@ -1030,7 +1045,7 @@ entry, return nil."
             (setq last-valid (point)))
         (error
          (and
-          (= ?\{ (char-after last-valid))
+          (eq ?\{ (char-after last-valid))
           (or (not exclude-braces)
               (not (= start-pos last-valid)))))))))
 (defvar my/bibtex-indent-width 4
@@ -1082,10 +1097,14 @@ otherwise, call `bibtex-find-text'."
 (evil-define-key 'normal bibtex-mode-map
   (kbd "TAB") 'my/bibtex-indent-or-find-text-and-insert)
 
+;; Latex help (from elisp file)
+(require 'latex-help)
+
 ;; AUCTeX
 (use-package auctex
   :hook ((LaTeX-mode . turn-on-reftex)
-         (LaTeX-mode . LaTeX-math-mode))
+         (LaTeX-mode . LaTeX-math-mode)
+         (LaTeX-mode . my/-setup-LaTeX-mode))
   :init
   (add-to-list 'major-mode-remap-alist '(plain-tex-mode . plain-TeX-mode))
   (add-to-list 'major-mode-remap-alist '(latex-mode . LaTeX-mode))
@@ -1095,6 +1114,8 @@ otherwise, call `bibtex-find-text'."
   (add-to-list 'major-mode-remap-alist '(doctex-mode . docTeX-mode))
   (add-to-list 'auto-mode-alist '("/\\.latexmkrc\\'" . perl-mode))
   :config
+  (defun my/-setup-LaTeX-mode ()
+    (setq evil-lookup-func 'latex-help-at-point))
   (setq TeX-auto-save t
         TeX-parse-self t
         reftex-plug-into-AUCTeX t)
@@ -1419,7 +1440,7 @@ argument."
       (funcall-interactively #'sage-shell:run-sage
                              (sage-shell:read-command)))))
 
-;; fricas (because I like calculator)
+;; fricas (because I like calculators)
 (add-to-list 'load-path "/usr/lib/fricas/emacs/")
 (use-package fricas
   :ensure nil
@@ -1762,10 +1783,14 @@ If no name is given, list all bookmarks instead."
     (setq-local evil-lookup-func #'helpful-at-point))
   (defun my/-setup-helpful-mode ()
     (setq-local evil-lookup-func #'helpful-at-point))
-  (defvar my/helpful-symbol-history-size 20
+  (defvar my/helpful-symbol-history-size 50
     "Max size of `my/helpful-symbol-history'.")
   (defvar my/helpful-symbol-history '()
     "History of helpful symbols.")
+  (defvar my/-helpful-inhibit-history nil
+    "If non-nil, don't add symbols to `my/helpful-symbol-history'.")
+  (defvar my/-helpful-last-entry nil
+    "Last entry looked up with helpful.")
   (defun my/helpful-history-back (count)
     "Go back COUNT symbols in `my/helpful-symbol-history'.  If called
 interactively, COUNT defaults to 1."
@@ -1791,7 +1816,8 @@ the oldest entry if -COUNT is larger than the history."
          ((and (< count 0) (= (1+ current-pos) hist-len))
           (message "%s" "No older symbol!"))
          (t
-          (let ((entry (cond
+          (let ((my/-helpful-inhibit-history t)
+                (entry (cond
                         ((<= new-pos 0)
                          (seq-first my/helpful-symbol-history))
                         ((>= new-pos hist-len)
@@ -1804,29 +1830,29 @@ the oldest entry if -COUNT is larger than the history."
   (defun my/-helpful-switch-buffer-function (helpful-buf)
     "Like `pop-to-buffer', but kill previous helpful buffers and save the new
 buffers `helpful--sym' to `my/helpful-symbol-history'."
-    (cl-loop for buf in (buffer-list)
+    (cl-loop with window = nil
-             with window = nil
+             for buf in (buffer-list)
-             with last-index = nil
              when (and
                    (not (eq buf helpful-buf))
                    (eq (buffer-local-value 'major-mode buf) 'helpful-mode))
              do
              (when-let (cur-window (get-buffer-window buf nil))
                (setq window cur-window))
-             (when-let (entry (buffer-local-value 'helpful--sym buf))
-               (setq last-index (seq-position my/helpful-symbol-history entry 'equal)))
              (kill-buffer buf)
              finally
-             (when-let ((entry (cons (buffer-local-value 'helpful--sym helpful-buf)
+             (let ((entry (cons (buffer-local-value 'helpful--sym helpful-buf)
                                 (buffer-local-value 'helpful--callable-p
-                                                         helpful-buf)))
+                                                    helpful-buf))))
-                        ((not (seq-contains-p my/helpful-symbol-history entry
+               (unless my/-helpful-inhibit-history
-                                              'equal))))
+                 (when-let (from-current-hist
-               (when last-index
+                            (member my/-helpful-last-entry
+                                    my/helpful-symbol-history))
+                   (setq my/helpful-symbol-history from-current-hist))
+                 (cl-pushnew entry my/helpful-symbol-history :test 'equal)
                  (setq my/helpful-symbol-history
-                       (seq-drop my/helpful-symbol-history last-index)))
+                       (seq-take my/helpful-symbol-history
-               (push entry my/helpful-symbol-history)
+                                 my/helpful-symbol-history-size)))
-               (seq-take my/helpful-symbol-history my/helpful-symbol-history-size))
+               (setq my/-helpful-last-entry entry))
              (if window
                  (window--display-buffer helpful-buf window 'reuse)
                (pop-to-buffer helpful-buf))))
@@ -1957,7 +1983,6 @@ one of the normal rainbow-delimiters-depth-N-face faces."
 
 ;; page break lines
 (use-package page-break-lines
-  :hook (helpful-mode . page-break-lines-mode)
   :config
   (global-page-break-lines-mode 1)
   (add-to-list 'page-break-lines-modes 'prog-mode)