From 9d7aabd29f758306343d992489a7caafbf933b86 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <id@ypei.org>
Date: Sat, 14 Oct 2023 13:08:03 +1100
Subject: [emacs] Switch shell buffers by prompt too

---
 emacs/.emacs.d/lisp/my/my-buffer.el | 34 ++++++++++++++----------------
 emacs/.emacs.d/lisp/my/my-prog.el   | 41 +++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 19 deletions(-)

(limited to 'emacs/.emacs.d/lisp')

diff --git a/emacs/.emacs.d/lisp/my/my-buffer.el b/emacs/.emacs.d/lisp/my/my-buffer.el
index af72cfb..2027b5d 100644
--- a/emacs/.emacs.d/lisp/my/my-buffer.el
+++ b/emacs/.emacs.d/lisp/my/my-buffer.el
@@ -26,7 +26,7 @@
 
 ;;; Code:
 
-;; Much of the following is from prot-emacs
+;; Some of the following was from prot-emacs
 (defun my-get-major-mode-for-buffer (buffer)
   "Returns the major mode for BUFFER."
   (buffer-local-value 'major-mode (get-buffer buffer)))
@@ -44,23 +44,19 @@
 
 (defun my-switch-to-buffer-matching-major-mode (mode)
   (interactive
-   (list (intern (completing-read "Major mode: "
-		                              (mapcar 'prin1-to-string (my-get-buffer-modes))))))
-  (switch-to-buffer
-   (read-buffer "Switch to buffer: " nil t
-		            (lambda (pair)
-		              (with-current-buffer (cdr pair)
-                    (derived-mode-p mode))))))
-
-(defun my--buffer-major-mode-prompt ()
-  "Prompt of `my-buffers-major-mode'."
-  (let ((major major-mode)
-        (read-buffer-function nil))
-    (read-buffer
-     (format "Buffer for %s: " major)
-     nil t
-     (lambda (pair)                     ; pair is (name-string . buffer-object)
-       (with-current-buffer (cdr pair) (derived-mode-p major))))))
+   (list (intern
+          (completing-read
+           "Major mode: "
+		       (mapcar 'prin1-to-string (my-get-buffer-modes))))))
+  (switch-to-buffer (my-read-buffer-by-mode)))
+
+(defun my-read-buffer-by-mode (mode)
+  (if (eq mode 'shell-mode)
+      (my-read-shell-buffer)
+    (read-buffer "Switch to buffer: " nil t
+		             (lambda (pair)
+		               (with-current-buffer (cdr pair)
+                     (derived-mode-p mode))))))
 
 ;;;###autoload
 (defun my-buffers-major-mode (&optional arg)
@@ -70,7 +66,7 @@ With a prefix-arg, prompt for major mode."
   (interactive "P")
   (if arg
       (call-interactively 'my-switch-to-buffer-matching-major-mode)
-    (switch-to-buffer (my--buffer-major-mode-prompt))))
+    (switch-to-buffer (my-read-buffer-by-mode))))
 
 (defun my-buffer-find-mode (mode)
   "Find a buffer of a given MODE not in a live window."
diff --git a/emacs/.emacs.d/lisp/my/my-prog.el b/emacs/.emacs.d/lisp/my/my-prog.el
index a0e0ce7..bee132f 100644
--- a/emacs/.emacs.d/lisp/my/my-prog.el
+++ b/emacs/.emacs.d/lisp/my/my-prog.el
@@ -140,6 +140,47 @@
 (defvar my-shell-buffer-list nil
   "List of shell mode buffers.")
 
+(defun my-shell-dir-filter (pairs)
+  "Filter function for `my-read-shell-buffer'."
+  (lambda (str pred flag)
+    (pcase flag
+      ('metadata
+       (list 'metadata
+             (cons 'annotation-function
+                   (lambda (c)
+                     (alist-get c pairs nil nil #'equal)))))
+      (t
+       (if (string-blank-p str)
+           (all-completions str pairs)
+         (all-completions
+          str
+          (lambda (&rest _)
+            (seq-map
+             #'car
+             (seq-filter
+              (lambda (x)
+                (unless (string-blank-p str)
+                  (or
+                   (string-match-p (regexp-quote str) (car x))
+                   (string-match-p (regexp-quote str) (cdr x)))))
+              pairs)))))))))
+
+(defun my-read-shell-buffer ()
+  "Switch to a shell buffer by default directory."
+  (interactive)
+  (let ((coll
+         (seq-map
+          (lambda (buffer)
+            (with-current-buffer buffer
+              (cons (buffer-name buffer) default-directory)))
+          (seq-filter
+           (lambda (buffer)
+             (with-current-buffer buffer
+               (derived-mode-p 'shell-mode)))
+           (buffer-list)))))
+    (completing-read "Shell prompt: "
+                     (my-shell-dir-filter coll))))
+
 (defun my-shell-open-or-cycle (arg)
   "Switch to or create a shell buffer.
 
-- 
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