├── .gitignore ├── LICENSE ├── README.org ├── cascading-dir-locals.el └── test └── cascading-dir-locals-test.el /.gitignore: -------------------------------------------------------------------------------- 1 | *.elc -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | GNU GENERAL PUBLIC LICENSE 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The GNU General Public License is a free, copyleft license for 12 | software and other kinds of works. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 631 | to attach them to the start of each source file to most effectively 632 | state the exclusion of warranty; and each file should have at least 633 | the "copyright" line and a pointer to where the full notice is found. 634 | 635 | 636 | Copyright (C) 637 | 638 | This program is free software: you can redistribute it and/or modify 639 | it under the terms of the GNU General Public License as published by 640 | the Free Software Foundation, either version 3 of the License, or 641 | (at your option) any later version. 642 | 643 | This program is distributed in the hope that it will be useful, 644 | but WITHOUT ANY WARRANTY; without even the implied warranty of 645 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 646 | GNU General Public License for more details. 647 | 648 | You should have received a copy of the GNU General Public License 649 | along with this program. If not, see . 650 | 651 | Also add information on how to contact you by electronic and paper mail. 652 | 653 | If the program does terminal interaction, make it output a short 654 | notice like this when it starts in an interactive mode: 655 | 656 | Copyright (C) 657 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 658 | This is free software, and you are welcome to redistribute it 659 | under certain conditions; type `show c' for details. 660 | 661 | The hypothetical commands `show w' and `show c' should show the appropriate 662 | parts of the General Public License. Of course, your program's commands 663 | might be different; for a GUI interface, you would use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or school, 666 | if any, to sign a "copyright disclaimer" for the program, if necessary. 667 | For more information on this, and how to apply and follow the GNU GPL, see 668 | . 669 | 670 | The GNU General Public License does not permit incorporating your program 671 | into proprietary programs. If your program is a subroutine library, you 672 | may consider it more useful to permit linking proprietary applications with 673 | the library. If this is what you want to do, use the GNU Lesser General 674 | Public License instead of this License. But first, please read 675 | . 676 | 677 | -------------------------------------------------------------------------------- /README.org: -------------------------------------------------------------------------------- 1 | * cascading-dir-locals.el 2 | 3 | Provides a global minor mode that changes how Emacs handles the lookup 4 | of applicable dir-locals files (=.dir-locals.el=): instead of starting 5 | at the directory of the visited file and moving up the directory tree 6 | only until a first dir-locals file is found, collect and apply all (!) 7 | dir-locals files found from the current directory up to the root one. 8 | 9 | Values specified in files nearer to the current directory take 10 | precedence over values in files farther away from it. 11 | 12 | You might want to use this to set dir-local variables that apply to all 13 | of your projects only once, then override or add variables on a 14 | per-project basis. 15 | 16 | See below for an [[#Example][example]] and [[#Caveats][caveats]]. 17 | 18 | * Installation 19 | 20 | If you use MELPA, an easy way to install this package is via 21 | =package-install=. Alternatively, download =cascading-dir-locals.el=, 22 | put it in your =load-path= and =require= it. Finally, use 23 | =(cascading-dir-locals-mode 1)= or =M-x cascading-dir-locals-mode= to 24 | turn on the provided minor mode. 25 | 26 | If you use both MELPA and =use-package=, you can use this, too: 27 | 28 | #+begin_src emacs-lisp 29 | (use-package cascading-dir-locals 30 | :ensure 31 | :config 32 | (cascading-dir-locals-mode 1)) 33 | #+end_src 34 | 35 | ** GNU Guix 36 | 37 | If you use [[https://guix.gnu.org/][GNU Guix]], this package can be installed via =guix install 38 | emacs-cascading-dir-locals=. Once installed, edit your Emacs configuration as 39 | above to enable the package. 40 | 41 | * Example 42 | 43 | Consider this example directory tree: 44 | 45 | #+begin_example 46 | home/ 47 | fritz/ 48 | .dir-locals.el { a=1, b=2 } 49 | foo/ 50 | .dir-locals.el { b=19, c=20 } 51 | bar/ 52 | baz.txt 53 | #+end_example 54 | 55 | When this minor mode is enabled, opening =/home/fritz/foo/bar/baz.txt= 56 | will apply =a=1=, =b=19= and =c=20=. When it's disabled, opening the 57 | file will apply =b=19= and =c=20= only (default behavior). 58 | 59 | If you try this out and don't get the results you expected, please make 60 | sure that you're actually opening a file vs. just switching to its 61 | pre-existing buffer (directory local variables only get applied when 62 | opening a file). 63 | 64 | Please also make sure to clear the cache of dir-locals files if you had 65 | previously opened the file while =cascading-dir-locals-mode= was still 66 | disabled (see caveats below). 67 | 68 | * Caveats 69 | 70 | Note that Emacs maintains a cache of dir-locals files and their content 71 | so it doesn't have to process them over and over again. In simplified 72 | terms, it uses the name of the directory that stores the found 73 | dir-locals file as the cache key for that file and invalidates the cache 74 | entry when it detects a change in the file (based on modification time). 75 | 76 | Because of the way Emacs and =cascading-dir-locals-mode= work, changes 77 | to any dir-locals files other than the one that's nearest to the current 78 | directory do not invalidate the cache and /therefore go unnoticed/. For 79 | the example above, if you open =baz.txt=, then change the contents of 80 | =/home/fritz/.dir-locals.el=, then close and re-open =baz.txt=, your 81 | updates to the dir-locals file will /not be detected/. 82 | 83 | You'd have to manually clear the cache (or restart Emacs) to force a 84 | re-read of the changed dir-locals file: 85 | 86 | #+begin_src elisp 87 | (setq dir-locals-directory-cache nil) ;; clear cache 88 | #+end_src 89 | 90 | While this sounds like a grave drawback, it turns out to be a non-issue 91 | in my day to day life as I rarely change shared dir-local variables. 92 | Ymmv, obviously. 93 | 94 | * Debugging 95 | 96 | Set =cascading-dir-locals-debug= to a non-nil value to print debug 97 | messages regarding the lookup and collection of dir-locals files to the 98 | =*Messages*= buffer. For the example above, opening =baz.txt= in a fresh 99 | Emacs session (that is, with an empty dir-locals cache, see caveats 100 | above) would result in the following debug messages: 101 | 102 | #+begin_example 103 | #: looking for dir-locals files in ~/foo/bar/ 104 | #: looking for dir-locals files in ~/foo/ 105 | #: looking for dir-locals files in ~/ 106 | #: looking for dir-locals files in /home/ 107 | #: looking for dir-locals files in / 108 | #: collecting dir-local variables from ~/.dir-locals.el 109 | #: collecting dir-local variables from ~/foo/.dir-locals.el 110 | #+end_example 111 | 112 | If you expect to see debug messages but get nothing, it very likely 113 | means that there is an entry in the dir-locals cache for the directory 114 | of the dir-locals file that is the nearest to the current directory. 115 | Please see the note on caveats above for how to fix this. 116 | -------------------------------------------------------------------------------- /cascading-dir-locals.el: -------------------------------------------------------------------------------- 1 | ;;; cascading-dir-locals.el --- Apply all (!) .dir-locals.el from root to current directory -*- lexical-binding: t; -*- 2 | 3 | ;; Copyright (C) 2021 Fritz Grabo 4 | 5 | ;; Author: Fritz Grabo 6 | ;; URL: https://github.com/fritzgrabo/cascading-dir-locals 7 | ;; Version: 0.1 8 | ;; Package-Requires: ((emacs "26.1")) 9 | ;; Keywords: convenience 10 | 11 | ;; This file is not part of GNU Emacs. 12 | 13 | ;; This program is free software; you can redistribute it and/or modify 14 | ;; it under the terms of the GNU General Public License as published by 15 | ;; the Free Software Foundation; either version 3 of the License, or (at 16 | ;; your option) any later version. 17 | ;; 18 | ;; This program is distributed in the hope that it will be useful, but 19 | ;; WITHOUT ANY WARRANTY; without even the implied warranty of 20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 | ;; General Public License for more details. 22 | ;; 23 | ;; You should have received a copy of the GNU General Public License 24 | ;; along with GNU Emacs; If not, see http://www.gnu.org/licenses. 25 | 26 | ;;; Commentary: 27 | 28 | ;; Provides a global minor mode that changes how Emacs handles the 29 | ;; lookup of applicable dir-locals files (".dir-locals.el"): instead of 30 | ;; starting at the directory of the visited file and moving up the 31 | ;; directory tree only until a first dir-locals file is found, collect 32 | ;; and apply all (!) dir-locals files found from the current directory 33 | ;; up to the root one. 34 | 35 | ;; Values specified in files nearer to the current directory take 36 | ;; precedence over values in files farther away from it. 37 | 38 | ;; You might want to use this to globally set dir-local variables that 39 | ;; apply to all of your projects, then override or add variables on a 40 | ;; per-project basis. 41 | 42 | ;;; Code: 43 | 44 | (eval-when-compile (require 'subr-x)) 45 | (require 'seq) 46 | 47 | (defcustom cascading-dir-locals-debug nil 48 | "When non-nil, print debug messages regarding the lookup and collection of dir-locals files." 49 | :type 'boolean 50 | :group 'find-file) 51 | 52 | (defun cascading-dir-locals--called-by-p (f &optional base) 53 | "Return t if the containing function was called by function F. 54 | If BASE is non-nil, ignore invocations of F after BASE." 55 | (catch 'found 56 | (mapbacktrace 57 | (lambda (_evald fun _args _flags) 58 | (when (eq fun f) (throw 'found t))) 59 | base))) 60 | 61 | (defun cascading-dir-locals--all-files (orig-fun dir) 62 | "Collect all dir-locals files found from the root directory up to DIR. 63 | Pass the unadvised version of `dir-locals--all-files' as ORIG-FUN." 64 | (let* ((dir (expand-file-name dir)) 65 | (parent-dir (file-name-directory (directory-file-name dir)))) 66 | (when cascading-dir-locals-debug 67 | (message "#<%s>: looking for dir-locals files in %s" 68 | (buffer-name) 69 | (abbreviate-file-name dir))) 70 | (if (equal parent-dir dir) ;; That is, we have hit the root directory: stop recursion. 71 | (apply orig-fun (list dir)) 72 | (let ((files-in-parent-dirs (cascading-dir-locals--all-files orig-fun parent-dir)) 73 | (files-in-dir (apply orig-fun (list dir)))) 74 | (when (and cascading-dir-locals-debug files-in-dir) 75 | (message "#<%s>: collecting dir-local variables from %s" 76 | (buffer-name) 77 | (string-join (seq-map #'abbreviate-file-name files-in-dir) ", "))) 78 | (append files-in-parent-dirs files-in-dir))))) 79 | 80 | (defun cascading-dir-locals--all-files-dispatch (orig-fun &rest args) 81 | "Based on caller, call original or recursive version of `dir-locals--all-files' (ORIG-FUN) with ARGS." 82 | ;; `dir-locals--all-files' is called in various places in "files.el"; 83 | ;; we only need it to do a (potentially expensive) recursion when it 84 | ;; is called by `dir-locals-read-from-dir'. 85 | (if (cascading-dir-locals--called-by-p #'dir-locals-read-from-dir #'dir-locals--all-files) 86 | (apply #'cascading-dir-locals--all-files orig-fun args) 87 | (apply orig-fun args))) 88 | 89 | ;;;###autoload 90 | (define-minor-mode cascading-dir-locals-mode 91 | "Apply all dir-locals files found from the current directory up to the root one." 92 | :global t 93 | :group 'find-file 94 | (if cascading-dir-locals-mode 95 | (advice-add #'dir-locals--all-files :around #'cascading-dir-locals--all-files-dispatch) 96 | (advice-remove #'dir-locals--all-files #'cascading-dir-locals--all-files-dispatch))) 97 | 98 | (provide 'cascading-dir-locals) 99 | ;;; cascading-dir-locals.el ends here 100 | -------------------------------------------------------------------------------- /test/cascading-dir-locals-test.el: -------------------------------------------------------------------------------- 1 | (require 'ert) 2 | 3 | (ert-deftest foobar () 4 | "Foobar" 5 | (should (equal 1 1))) 6 | --------------------------------------------------------------------------------