bug#54100: 29.0.50; Allow project-buffers to ignore some buffers

[Manuel Uberti]

Hi,

currently I am redifining `project-buffers' to ensure 'C-x p b'
(`project-switch-to-buffer') ignores some buffers I never want to switch to with 
that command:

(defvar mu-ignored-buffers
  '("\\` " "^\\*Async" "^\\*Completions" "^\\*Flymake" "^\\*Help"
    "^\\*Messages" "^\\*eldoc" "^\\*envrc" "\\*tramp" "^\\*vc" "^\\*xref")
  "A list of predicates for buffers to ignore.")

(cl-defmethod project-buffers ((project (head vc)))
  (let* ((root (expand-file-name (file-name-as-directory (project-root 
project))))
         (modules (unless (or (project--vc-merge-submodules-p root)
                              (project--submodule-p root))
                    (mapcar
                     (lambda (m) (format "%s%s/" root m))
                     (project--git-submodules))))
         dd
         bufs)
    (dolist (buf (buffer-list))
      (setq dd (expand-file-name (buffer-local-value 'default-directory buf)))
      (when (and (string-prefix-p root dd)
                 (not (cl-find-if (lambda (module) (string-prefix-p module dd))
                                  modules))
                 (not (seq-contains-p
                       mu-ignored-buffers (buffer-name buf) #'string-match-p)))
        (push buf bufs)))
    (nreverse bufs)))

I am not sure this is the best approach, though.

Would it be possible to add a defcustom to specify a predicate for the project 
buffers to be shown in `project-switch-to-buffer'?


In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.18, cairo 
version 1.16.0)
 of 2022-02-22 built on hathaway
Repository revision: 8d02624c0ec029ee99e0b1e410429c440bcc4499
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04 LTS

Configured using:
 'configure --with-harfbuzz --with-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: it_IT.UTF-8
  value of $LC_NUMERIC: it_IT.UTF-8
  value of $LC_TIME: it_IT.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
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  delete-selection-mode: t
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  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
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  global-font-lock-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
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  column-number-mode: t
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Load-path shadows:
None found.

Features:
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mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils help-fns radix-tree misearch multi-isearch
time-date noutline outline checkdoc lisp-mnt elec-pair flymake-proc
flymake thingatpt compile text-property-search comint vc-dir ewoc vc-git
diff-mode easy-mmode vc vc-dispatcher cursor-sensor project server
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winner envrc inheritenv ansi-color mct pixel-scroll ring minibuf-eldef
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Memory information:
((conses 16 241664 84480)
 (symbols 48 15348 1)
 (strings 32 46778 3597)
 (string-bytes 1 1497114)
 (vectors 16 28407)
 (vector-slots 8 833744 120150)
 (floats 8 139 444)
 (intervals 56 1087 217)
 (buffers 992 18))

--
Manuel Uberti
www.manueluberti.eu