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bug#32731: 26.1.50; Ibuffer filter by mode: Handle >1 mode names

From: Tino Calancha
Subject: bug#32731: 26.1.50; Ibuffer filter by mode: Handle >1 mode names
Date: Fri, 14 Sep 2018 03:19:21 +0900

Severity: wishlist

Ibuffer filtering is a great feature.
If you just want to filter by 1 major, then it's quite straight.

/m [mode1-name] RET

Filtering by >1 major mode is still possible; you must
combine the individuals filters with `ibuffer-or-filter':

/m [mode1-name] RET
/m [mode2-name] RET
/m [mode3-name] RET
/m [modeN-name] RET

This become a bit cumbersome with > 2 mode names; you also need to
remember how to combine filters, which I usually forget :-|

Following patch adds a new command `ibuffer-filter-by-used-modes',
similar as `ibuffer-filter-by-used-mode', to simplify this filtering.

The new command accepts a list of mode names, and it takes care
internally of the filter composition.

Interactively, it preserves the interface of `ibuffer-filter-by-used-mode',
with the only difference that the user might input a comma separated
list of mode names.  For instance,

;; Following produces identical result as the original command
M-x ibuffer-filter-by-used-modes RET mode1-mode RET

;; This is equivalent to create the N filters + OR-compose them
M-x ibuffer-filter-by-used-modes RET mode1-mode,mode2-mode,...,modeN-mode RET

--8<-----------------------------cut here---------------start------------->8---
commit e36ff5779764e531cc149e4342e93cb6e37c30ee
Author: Tino Calancha <address@hidden>
Date:   Fri Sep 14 03:10:11 2018 +0900

    Ibuffer filter by mode: Handle >1 mode names
    Extend used mode filtering so that we can input >1 mode.
    For instance, if we want to filter all buffers in
    C or C++ mode, then we can call the filter interactively
    with input: 'c-mode,c++-mode'.
    * lisp/ibuf-ext.el (ibuffer-filter-by-used-modes):
    New command.  Accept a list of mode names (symbols).
    Interactively, accept a comma separated list of mode names.
    * lisp/ibuffer.el(ibuffer-mode-map): Rebind '/ m' to
    the new command.
    * etc/NEWS(Ibuffer): Announce this change.

diff --git a/etc/NEWS b/etc/NEWS
index a54ac2db43..6ef6f20b05 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -48,6 +48,11 @@ often cause crashes.  Set it to nil if you really need those 
 ** Ibuffer
+*** The new command 'ibuffer-filter-by-used-modes', bound
+to '/ m', extends 'ibuffer-filter-by-used-mode'; it makes easy
+filtering buffers by a list of major modes.
 *** New toggle 'ibuffer-do-toggle-lock', bound to 'L'.
 ** Imenu
diff --git a/lisp/ibuf-ext.el b/lisp/ibuf-ext.el
index a3143e5e29..b7c3ae8030 100644
--- a/lisp/ibuf-ext.el
+++ b/lisp/ibuf-ext.el
@@ -1265,6 +1265,34 @@ used-mode
        (ibuffer-list-buffer-modes) nil t nil nil default))))
   (eq qualifier (buffer-local-value 'major-mode buf)))
+(defun ibuffer-filter-by-used-modes(modes)
+  "Limit current view to buffers with major mode in MODES.
+MODES is a list of mode names (symbols).
+When called interactively, accept the mode names separated by commas."
+  (interactive
+   (let* ((buf (ibuffer-current-buffer))
+          (default (if (and buf (buffer-live-p buf))
+                       (symbol-name (buffer-local-value
+                                     'major-mode buf)))))
+     (list
+      (mapcar #'intern
+              (split-string
+               (completing-read
+                (if default
+                    (format "Filter by major mode (default %s): " default)
+                  "Filter by major mode: ")
+                (ibuffer-list-buffer-modes)
+                nil nil nil nil default)
+               "\\s-*,\\s-*" t)))))
+  (setq modes (delete-dups modes))
+  (mapc #'ibuffer-filter-by-used-mode modes)
+  (let ((nb_modes (length modes)))
+    (when (>= nb_modes 2)
+      (cl-loop repeat (- nb_modes 2) do (ibuffer-or-filter))
+      (message nil)
+      (ibuffer-or-filter))))
 ;;;###autoload (autoload 'ibuffer-filter-by-derived-mode "ibuf-ext")
 (define-ibuffer-filter derived-mode
     "Limit current view to buffers whose major mode inherits from QUALIFIER."
diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
index 08b0801cb5..f7c20d0da3 100644
--- a/lisp/ibuffer.el
+++ b/lisp/ibuffer.el
@@ -519,7 +519,7 @@ ibuffer-mode-map
     (define-key map (kbd "s m") 'ibuffer-do-sort-by-major-mode)
     (define-key map (kbd "/ RET") 'ibuffer-filter-by-mode)
-    (define-key map (kbd "/ m") 'ibuffer-filter-by-used-mode)
+    (define-key map (kbd "/ m") 'ibuffer-filter-by-used-modes)
     (define-key map (kbd "/ M") 'ibuffer-filter-by-derived-mode)
     (define-key map (kbd "/ n") 'ibuffer-filter-by-name)
     (define-key map (kbd "/ *") 'ibuffer-filter-by-starred-name)
--8<-----------------------------cut here---------------end--------------->8---
In GNU Emacs 26.1.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2018-09-14 built
Repository revision: 41cdda22c78eb0b00612ce25cdb356dd64322fcc

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