[nongnu] elpa/idris-mode 600c8f584b 1/8: Make `idris-info-mode` derived from `help-mode` and

[ELPA Syncer]

branch: elpa/idris-mode
commit 600c8f584b21d650926c83c741e3e1c42adfe3dd
Author: Marek L <nospam.keram@gmail.com>
Commit: Marek L <nospam.keram@gmail.com>

    Make `idris-info-mode` derived from `help-mode` and
    
    reuse existing functionality from help-mode
    for navigating through history and buffer handling.
    
    Why:
    To reduce maintanance cost of maintaining own implementation
    and to improve user experience by relying on
    existing Emacs conventions.
---
 idris-info.el               | 109 ++++++++++----------------------------------
 test/idris-commands-test.el |   7 +--
 test/idris-info-test.el     |  76 ++++++++++++++++++++++++++++++
 test/idris-tests.el         |   1 +
 4 files changed, 102 insertions(+), 91 deletions(-)

diff --git a/idris-info.el b/idris-info.el
index 228f596223..24ad055007 100644
--- a/idris-info.el
+++ b/idris-info.el
@@ -28,42 +28,7 @@
 (require 'prop-menu)
 (require 'idris-core)
 (require 'idris-common-utils)
-
-
-(defvar idris-info-history (list () nil ())
-  "A zipper into the history for idris-info-mode.
-It is a three-element list whose first element is the history,
-whose second element is the current item if applicable or NIL
-otherwise, and whose third element is the future.")
-
-(defun idris-info-history-clear ()
-  "Reset the history for Idris info buffers."
-  (setq idris-info-history (list () nil ())))
-
-(defun idris-info-history-insert (contents)
-  "Insert CONTENTS into the Idris info history as the current node.
-Following the behavior of Emacs help buffers, the future is deleted."
-  (pcase-let ((`(,past ,present ,_future) idris-info-history))
-    (setq idris-info-history
-          (if present
-              (list (cons present past) contents ())
-            (list past contents ())))))
-
-(defun idris-info-history-back ()
-  "Move back in the Idris info history."
-  (setq idris-info-history
-        (pcase idris-info-history
-          (`((,prev . ,past) ,present ,future)
-           (list past prev (cons present future)))
-          (`(() ,present ,future) (list () present future)))))
-
-(defun idris-info-history-forward ()
-  "Move forward in the Idris info history."
-  (setq idris-info-history
-        (pcase idris-info-history
-          (`(,past ,present (,next . ,future))
-           (list (cons present past) next future))
-          (`(,past ,present ()) (list past present ())))))
+(require 'help-mode)
 
 (defvar idris-info-buffer-name (idris-buffer-name :info)
   "The name of the buffer containing Idris help information")
@@ -71,7 +36,6 @@ Following the behavior of Emacs help buffers, the future is 
deleted."
 (defvar idris-info-mode-map
   (let ((map (make-keymap)))
     (suppress-keymap map) ; remove the self-inserting char commands
-    (define-key map (kbd "q") 'idris-info-quit)
     ;;; Allow buttons to be clicked with the left mouse button in info buffers
     (define-key map [follow-link] 'mouse-face)
     (cl-loop for keyer
@@ -82,75 +46,48 @@ Following the behavior of Emacs help buffers, the future is 
deleted."
     map))
 
 (easy-menu-define idris-info-mode-menu idris-info-mode-map
-  "Menu for the Idris info buffer"
+  "Menu for the Idris info buffer."
   `("Idris Info"
     ["Show term interaction widgets" idris-add-term-widgets t]
     ["Close Idris info buffer" idris-info-quit t]))
 
-(define-derived-mode idris-info-mode fundamental-mode "Idris Info"
-  "Major mode used for transient Idris information buffers
-    \\{idris-info-mode-map}
+(define-derived-mode idris-info-mode help-mode "Idris Info"
+  "Major mode used for transient Idris information.
+\\{idris-info-mode-map}
 Invokes `idris-info-mode-hook'."
+  (setq-local prop-menu-item-functions '(idris-context-menu-items))
   (set (make-local-variable 'prop-menu-item-functions) 
'(idris-context-menu-items)))
-; if we use view-mode here, our key binding q would be shadowed.
 
 (defun idris-info-buffer ()
-  "Return the Idris info buffer, creating one if there is not one.
-Ensure that the buffer is in `idris-info-mode'."
+  "Return Idris info buffer."
   (let ((buffer (get-buffer-create idris-info-buffer-name)))
     (with-current-buffer buffer
       (when (not (eq major-mode 'idris-info-mode))
         (idris-info-mode)))
     buffer))
 
-(defun idris-info-quit ()
-  (interactive)
-  (idris-kill-buffer idris-info-buffer-name))
-
-(defun idris-info-buffer-visible-p ()
-  (if (get-buffer-window idris-info-buffer-name 'visible) t nil))
-
-(defun idris-info-show ()
-  "Show the Idris info buffer."
-  (interactive)
-  (with-current-buffer (idris-info-buffer)
-    (setq buffer-read-only t)
-    (pcase-let ((inhibit-read-only t)
-                (`(,past ,present ,future) idris-info-history))
-      (erase-buffer)
-      (when present
-        (insert present)
-        (insert "\n\n"))
-      (when past
-        (insert-button "[back]" 'action #'(lambda (_) (interactive) 
(idris-info-history-back) (idris-info-show))))
-      (when (and past future) (insert "\t"))
-      (when future
-        (insert-button "[forward]" 'action #'(lambda (_) (interactive) 
(idris-info-history-forward) (idris-info-show))))
-      (when (or past future) (newline))
-      (goto-char (point-min))))
-  (unless (idris-info-buffer-visible-p)
-    (pop-to-buffer (idris-info-buffer))
-    (message "Press q to close the Idris info buffer.")))
+(defalias 'idris-info-quit #'quit-window)
 
 (defmacro with-idris-info-buffer (&rest cmds)
   "Execute `CMDS' in a fresh Idris info buffer, then display it to the user."
   (declare (indent defun))
-  (let ((str-info (gensym "STR-INFO")))
-    `(let ((,str-info (with-temp-buffer
-                        ,@cmds
-                        (buffer-string))))
-       (idris-info-history-insert ,str-info)
-       (idris-info-show))))
-
+  `(idris-show-info (with-temp-buffer ,@cmds (buffer-string))))
 
 (defun idris-show-info (info-string &optional spans)
-  "Show INFO-STRING in the Idris info buffer, obliterating its previous 
contents."
-  (with-idris-info-buffer
-    (idris-propertize-spans (idris-repl-semantic-text-props spans)
-      (insert info-string)))
-  info-string)
-
-
+  "Show INFO-STRING with SPANS in the Idris info buffer."
+  (with-current-buffer (idris-info-buffer)
+    ;; (help-xref-following t) ensure that current buffer -> idris-info-buffer
+    ;; is recognised by `help-setup-xref' and `with-help-window'
+    ;; as `help-buffer'
+    (let ((help-xref-following t))
+      (help-setup-xref (list #'idris-show-info info-string spans)
+                       (called-interactively-p 'interactive))
+      (with-help-window (current-buffer)
+        (idris-propertize-spans (idris-repl-semantic-text-props spans)
+          (insert info-string)))
+      ;; reset major-mode for idris-info-buffer
+      ;; back from help-mode to idris-info-mode
+      (idris-info-buffer))))
 
 (provide 'idris-info)
 ;;; idris-info.el ends here
diff --git a/test/idris-commands-test.el b/test/idris-commands-test.el
index 98a430f0f6..ec5b6fda4d 100644
--- a/test/idris-commands-test.el
+++ b/test/idris-commands-test.el
@@ -264,7 +264,6 @@ myReverse xs = revAcc [] xs where
                                 (7 4 ((:tt-term "AAAAAAAAAAAHAAAAAAA"))))))
       (advice-add 'idris-load-file-sync :override #'idris-load-file-sync-stub)
       (advice-add 'idris-eval :override #'idris-eval-stub)
-
       (unwind-protect
           (with-current-buffer buffer
             (switch-to-buffer buffer)
@@ -273,10 +272,8 @@ myReverse xs = revAcc [] xs where
             (funcall-interactively 'idris-type-at-point nil)
             (should (eq file-loaded-p t))
             (should (equal eval-args '((:type-of "Test"))))
-            (should (string= (buffer-name) idris-info-buffer-name))
-            (should (string-match-p "Test : Type" 
(buffer-substring-no-properties (point-min) (point-max))))
-            (idris-info-quit)
-            (should (eq (current-buffer) buffer)))
+            (with-current-buffer idris-info-buffer-name
+              (should (string-match-p "Test : Type" (buffer-string)))))
 
         (advice-remove 'idris-load-file-sync #'idris-load-file-sync-stub)
         (advice-remove 'idris-eval #'idris-eval-stub)
diff --git a/test/idris-info-test.el b/test/idris-info-test.el
new file mode 100644
index 0000000000..ad1c313c7d
--- /dev/null
+++ b/test/idris-info-test.el
@@ -0,0 +1,76 @@
+;;; idris-info-test.el --- Tests related to Idris info buffer -*- 
lexical-binding: t -*-
+;; Copyright (C) 2022  Marek L.
+
+;; Author: Marek L <nospam.keram@gmail.com>
+;; Keywords: languages, Idris, help-mode, Ert
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'idris-info)
+
+(ert-deftest idris-show-info ()
+  "Test displaying information in `idris-info-buffer'."
+  (let ((info-str "Bool : Type")
+        (info-spans '((0 4 ((:name "Prelude.Bool.Bool")
+                            (:implicit :False)
+                            (:key "AQA")
+                            (:decor :type)
+                            (:doc-overview "Boolean Data Type")
+                            (:type "Type")
+                            (:namespace "Prelude.Bool")))
+                      (7 4 ((:decor :type)
+                            (:type "Type")
+                            (:doc-overview "The type of types")
+                            (:name "Type")))
+                      (7 4 ((:tt-term "AAA"))))))
+
+    (idris-show-info info-str info-spans)
+
+    (should (window-valid-p (get-buffer-window (get-buffer 
idris-info-buffer-name))))
+
+    (with-current-buffer (get-buffer idris-info-buffer-name)
+      (should (string-match-p info-str (buffer-string))))
+    ;; TODO: Assert styling, context menu etc.
+
+    ;; Cleanup
+    (kill-buffer idris-info-buffer-name)))
+
+(ert-deftest idris-info-buffer-history ()
+  "Test displaying information in `idris-info-buffer'."
+  (let ((info-str "First information")
+        (info-str2 "Second information"))
+
+    (idris-show-info info-str)
+
+    (with-current-buffer (get-buffer idris-info-buffer-name)
+      (should (string-match-p info-str (buffer-string)))
+      (should (not (string-match-p "back" (buffer-string))))
+
+      (idris-show-info info-str2)
+      (should (string-match-p info-str2 (buffer-string)))
+      (should (string-match-p "back" (buffer-string)))
+      (help-go-back)
+
+      (should (string-match-p info-str (buffer-string)))
+      (should (string-match-p "forward" (buffer-string))))
+
+    ;; Cleanup
+    (kill-buffer idris-info-buffer-name)))
+
+(provide 'idris-info-test)
+
+;;; idris-info-test.el ends here
diff --git a/test/idris-tests.el b/test/idris-tests.el
index e14944e046..8a5f8d791d 100644
--- a/test/idris-tests.el
+++ b/test/idris-tests.el
@@ -183,6 +183,7 @@
 (load "idris-navigate-test")
 (load "idris-repl-test")
 (load "idris-xref-test")
+(load "idris-info-test")
 
 (provide 'idris-tests)
 ;;; idris-tests.el ends here