├── LICENSE ├── README.org ├── example.gif └── magit-diff-flycheck.el /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | magit-diff-flycheck Copyright (C) 2019 Alex Ragone 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type YYshow c' for details. 657 | 658 | The hypothetical commands Yshow c' should show the appropriate 659 | parts of the General Public License. Of course, your program's commands 660 | might be different; for a GUI interface, you would use an "about box". 661 | 662 | You should also get your employer (if you work as a programmer) or school, 663 | if any, to sign a "copyright disclaimer" for the program, if necessary. 664 | For more information on this, and how to apply and follow the GNU GPL, see 665 | . 666 | 667 | The GNU General Public License does not permit incorporating your program 668 | into proprietary programs. If your program is a subroutine library, you 669 | may consider it more useful to permit linking proprietary applications with 670 | the library. If this is what you want to do, use the GNU Lesser General 671 | Public License instead of this License. But first, please read 672 | . 673 | -------------------------------------------------------------------------------- /README.org: -------------------------------------------------------------------------------- 1 | [[file:example.gif]] 2 | 3 | Run ~M-x magit-diff-flycheck~ in a magit-diff buffer to display a 4 | filtered list of Flycheck errors for the added/modified lines only. 5 | 6 | Use can also run the command with a prefix which will prompt you for 7 | the scope of the errors, eg. ~C-u M-x magit-diff-flycheck~. 8 | 9 | This is primarily meant to be used on legacy projects where you do 10 | not want to see errors for the whole file but only for the added/modified 11 | lines. 12 | 13 | * Install 14 | 15 | Available on [[https://melpa.org/#/magit-diff-flycheck][MELPA]]. 16 | 17 | ** Main dependencies 18 | + ~magit~ 19 | + ~flycheck~ 20 | 21 | ** Extra Dependencies 22 | + ~seq~ 23 | 24 | * Configuration 25 | | Variable | Notes | Default | 26 | |---------------------------------------+---------------------------------------------------+---------| 27 | | ~magit-diff-flycheck-inhibit-message~ | If non-nil, disable message output while running. | ~t~ | 28 | | ~magit-diff-flycheck-default-scope~ | The default scope for filtering errors. | ~lines~ | 29 | | ~magit-diff-flycheck-context~ | Lines of context for diff when filtering errors. | ~0~ | 30 | 31 | * Usage 32 | Open up a magit-diff buffer and run ~M-x magit-diff-flycheck~. 33 | -------------------------------------------------------------------------------- /example.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ragone/magit-diff-flycheck/28acf74f59e385865746cccf4b1e4c4025ae9433/example.gif -------------------------------------------------------------------------------- /magit-diff-flycheck.el: -------------------------------------------------------------------------------- 1 | ;;; magit-diff-flycheck.el --- Report errors in diffs -*- lexical-binding: t; -*- 2 | 3 | ;; Author: Alex Ragone 4 | ;; Created: 05 May 2019 5 | ;; Homepage: https://github.com/ragone/magit-diff-flycheck 6 | ;; Keywords: convenience, matching 7 | ;; Package-Version: 0.1.0 8 | ;; Package-Requires: ((magit "2") (flycheck "31") (seq "2") (emacs "25.1")) 9 | 10 | ;; This file is not part of GNU Emacs. 11 | 12 | ;; This program is free software: you can redistribute it and/or modify 13 | ;; it under the terms of the GNU General Public License as published by 14 | ;; the Free Software Foundation, either version 3 of the License, or 15 | ;; (at your option) any later version. 16 | 17 | ;; This program is distributed in the hope that it will be useful, 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 | ;; GNU General Public License for more details. 21 | 22 | ;; You should have received a copy of the GNU General Public License 23 | ;; along with this program. If not, see . 24 | 25 | ;;; Commentary: 26 | 27 | ;; Run M-x magit-diff-flycheck in a magit-diff buffer to display a 28 | ;; filtered list of errors for the added/modified lines only. 29 | ;; 30 | ;; This is primarily meant to be used on legacy projects where you do 31 | ;; not want to see errors for the whole file but only for the added/modified 32 | ;; lines. 33 | 34 | ;;; Code: 35 | 36 | ;;;; Requirements 37 | 38 | (require 'magit) 39 | (require 'flycheck) 40 | (require 'seq) 41 | (require 'tabulated-list) 42 | 43 | ;;;; Customization 44 | 45 | (defgroup magit-diff-flycheck nil 46 | "Run Flycheck on Git diffs." 47 | :group 'magit-diff) 48 | 49 | (defcustom magit-diff-flycheck-inhibit-message t 50 | "If non-nil, disable message output while running." 51 | :group 'magit-diff-flycheck 52 | :type 'boolean) 53 | 54 | (defcustom magit-diff-flycheck-context 0 55 | "Lines of context for diff when filtering errors. 56 | 57 | This is ignored if `magit-diff-flycheck-default-scope' 58 | is set to the symbol `files'." 59 | :group 'magit-diff-flycheck 60 | :type 'integer) 61 | 62 | (defcustom magit-diff-flycheck-default-scope 'lines 63 | "The default scope for filtering errors." 64 | :group 'magit-diff-flycheck 65 | :type '(choice (const :tag "Files" files) 66 | (const :tag "Lines" lines))) 67 | 68 | ;;;; Variables 69 | 70 | (defvar magit-diff-flycheck--current-errors nil 71 | "List of `flycheck-error' for all the buffers.") 72 | 73 | (defvar magit-diff-flycheck--file-sections nil 74 | "List of file-sections which are being checked.") 75 | 76 | (defvar magit-diff-flycheck--checked 0 77 | "Count of file-sections which have been checked.") 78 | 79 | (defvar magit-diff-flycheck--progress-reporter nil 80 | "The progress reporter.") 81 | 82 | (defvar magit-diff-flycheck--scope nil 83 | "The current scope for filtering errors.") 84 | 85 | (defvar magit-diff-flycheck--diff-buffer nil 86 | "The Magit Diff buffer.") 87 | 88 | (defvar-local magit-diff-flycheck--after-syntax-check-function nil 89 | "The function to run after syntax check for the current buffer.") 90 | 91 | (defconst magit-diff-flycheck--error-list-format 92 | (seq-into (seq-map (lambda (el) 93 | (if (string= (car el) "File") 94 | '("File" 20 magit-diff-flycheck--list-entry-<) 95 | el)) 96 | flycheck-error-list-format) 97 | 'vector) 98 | "Table format for the error list. 99 | 100 | Use the format specified by `flycheck-error-list-format' 101 | but make the File column wider and sortable.") 102 | 103 | ;;;; Functions 104 | 105 | ;;;;; Commands 106 | 107 | ;;;###autoload 108 | (defun magit-diff-flycheck (&optional scope) 109 | "Run flycheck for SCOPE in `magit-diff-mode'." 110 | (interactive (and current-prefix-arg 111 | (list (intern (completing-read "Scope: " 112 | '(lines files) 113 | nil 114 | t))))) 115 | (unless (derived-mode-p 'magit-diff-mode) 116 | (user-error "Not in magit-diff-mode")) 117 | (magit-diff-flycheck--setup (or scope magit-diff-flycheck-default-scope)) 118 | (magit-diff-flycheck--run)) 119 | 120 | (defun magit-diff-flycheck-list-errors () 121 | "Show the error list." 122 | (interactive) 123 | (unless (get-buffer flycheck-error-list-buffer) 124 | (with-current-buffer (get-buffer-create flycheck-error-list-buffer) 125 | (magit-diff-flycheck-error-list-mode))) 126 | (display-buffer flycheck-error-list-buffer) 127 | (flycheck-error-list-refresh)) 128 | 129 | ;;;;; Support 130 | 131 | (defun magit-diff-flycheck--setup (scope) 132 | "Setup before running for SCOPE." 133 | (magit-diff-set-context (lambda (_cur) magit-diff-flycheck-context)) 134 | (setq magit-diff-flycheck--checked 0 135 | magit-diff-flycheck--file-sections 136 | (seq-filter #'magit-file-section-p 137 | (oref magit-root-section children)) 138 | magit-diff-flycheck--progress-reporter 139 | (make-progress-reporter "Running Flycheck on Diff..." 140 | 0 141 | (length magit-diff-flycheck--file-sections)) 142 | magit-diff-flycheck--diff-buffer (current-buffer) 143 | magit-diff-flycheck--scope scope) 144 | (magit-diff-flycheck-clear-errors) 145 | (magit-diff-flycheck--quiet t)) 146 | 147 | (defun magit-diff-flycheck--teardown () 148 | "Teardown after running." 149 | (switch-to-buffer magit-diff-flycheck--diff-buffer) 150 | (magit-diff-default-context) 151 | (magit-diff-flycheck--quiet nil) 152 | (progress-reporter-done magit-diff-flycheck--progress-reporter)) 153 | 154 | (defun magit-diff-flycheck--quiet (activep) 155 | "Set `inhibit-message' to ACTIVEP. 156 | 157 | This is ignored if `magit-diff-flycheck-inhibit-message' is nil." 158 | (when magit-diff-flycheck-inhibit-message 159 | (setq inhibit-message activep))) 160 | 161 | (defun magit-diff-flycheck--run () 162 | "Run the checkers on the files in the diff buffer." 163 | (seq-do #'magit-diff-flycheck--file-section 164 | magit-diff-flycheck--file-sections) 165 | (magit-diff-flycheck-list-errors)) 166 | 167 | (defun magit-diff-flycheck--file-section (file-section) 168 | "Run flycheck on FILE-SECTION." 169 | (let* ((filename (oref file-section value)) 170 | (buffer (magit-diff-visit-file filename))) 171 | (unless (and buffer 172 | (magit-diff-flycheck--buffer buffer file-section)) 173 | (magit-diff-flycheck--cleanup)))) 174 | 175 | (defun magit-diff-flycheck--buffer (buffer file-section) 176 | "Run flycheck on BUFFER for FILE-SECTION." 177 | (with-current-buffer buffer 178 | (magit-diff-flycheck--setup-buffer 179 | (apply-partially #'magit-diff-flycheck--flycheck-collect-errors 180 | file-section)) 181 | (with-demoted-errors "Diff Flycheck Error: %S" 182 | (magit-diff-flycheck--current-buffer-maybe)))) 183 | 184 | (defun magit-diff-flycheck--setup-buffer (err-fun) 185 | "Setup buffer with ERR-FUN." 186 | (add-hook 'flycheck-after-syntax-check-hook err-fun nil t) 187 | (setq magit-diff-flycheck--after-syntax-check-function err-fun) 188 | (setq-local flycheck-checker-error-threshold nil)) 189 | 190 | (defun magit-diff-flycheck--current-buffer-maybe () 191 | "Run flycheck in the current buffer. 192 | 193 | Prompt user to enable variable `flycheck-mode' if set to nil." 194 | (when (and (not flycheck-mode) 195 | (flycheck-may-enable-mode) 196 | (y-or-n-p "Enable Flycheck? ")) 197 | (flycheck-mode t)) 198 | (when (flycheck-get-checker-for-buffer) 199 | (or (flycheck-buffer) 200 | t))) 201 | 202 | (defun magit-diff-flycheck--cleanup () 203 | "Cleanup after running checkers." 204 | (when magit-diff-flycheck--after-syntax-check-function 205 | (remove-hook 'flycheck-after-syntax-check-hook 206 | magit-diff-flycheck--after-syntax-check-function 207 | t) 208 | (setq magit-diff-flycheck--after-syntax-check-function nil 209 | magit-diff-flycheck--checked (1+ magit-diff-flycheck--checked)) 210 | (magit-diff-flycheck--quiet nil) 211 | (progress-reporter-update magit-diff-flycheck--progress-reporter 212 | magit-diff-flycheck--checked) 213 | (magit-diff-flycheck--quiet t)) 214 | (unless (magit-diff-flycheck--running-p) 215 | (magit-diff-flycheck--teardown))) 216 | 217 | (defun magit-diff-flycheck-clear-errors () 218 | "Clear the displayed errors." 219 | (setq magit-diff-flycheck--current-errors nil) 220 | (flycheck-error-list-refresh)) 221 | 222 | (defun magit-diff-flycheck--remove-filename (oldfun err) 223 | "Remove the filename from ERR, run OLDFUN and revert the filename." 224 | (let ((mode-active (derived-mode-p 'magit-diff-flycheck-error-list-mode)) 225 | (file (flycheck-error-filename err))) 226 | (when mode-active 227 | (setf (flycheck-error-filename err) nil)) 228 | (apply oldfun (list err)) 229 | (when mode-active 230 | (setf (flycheck-error-filename err) file)))) 231 | 232 | (defun magit-diff-flycheck--contained-in-diff-p (err hunk-sections) 233 | "Return non-nil if ERR is contained in any of the HUNK-SECTIONS." 234 | (seq-some (lambda (hunk) 235 | (let* ((to-range (oref hunk to-range)) 236 | (start (nth 0 to-range)) 237 | (len (nth 1 to-range)) 238 | (end (+ start (if len (1- len) 0))) 239 | (err-line (flycheck-error-line err))) 240 | (<= start err-line end))) 241 | hunk-sections)) 242 | 243 | (defun magit-diff-flycheck--upcase-filename (err) 244 | "Upcase the filename from Flycheck ERR." 245 | (let ((filename (flycheck-error-filename err))) 246 | (if filename 247 | (upcase (file-name-nondirectory filename)) 248 | ""))) 249 | 250 | (defun magit-diff-flycheck--list-entry-< (entry1 entry2) 251 | "Return non-nil if ENTRY1 comes before ENTRY2." 252 | (let ((filename1 (magit-diff-flycheck--upcase-filename (car entry1))) 253 | (filename2 (magit-diff-flycheck--upcase-filename (car entry2)))) 254 | (if (string= filename1 filename2) 255 | (flycheck-error-list-entry-< entry1 entry2) 256 | (string< filename1 filename2)))) 257 | 258 | (defun magit-diff-flycheck--filter-errors (errors file-section) 259 | "Filter ERRORS for FILE-SECTION." 260 | (pcase magit-diff-flycheck--scope 261 | ('lines (seq-filter (lambda (err) 262 | (magit-diff-flycheck--contained-in-diff-p 263 | err 264 | (oref file-section children))) 265 | errors)) 266 | ('files errors) 267 | (_ (error "Scope is not set")))) 268 | 269 | (defun magit-diff-flycheck--get-errors (filename) 270 | "Get errors from `flycheck-current-errors' and add FILENAME if missing." 271 | (seq-map (lambda (err) 272 | (unless (flycheck-error-filename err) 273 | (setf (flycheck-error-filename err) filename)) 274 | err) 275 | flycheck-current-errors)) 276 | 277 | (defun magit-diff-flycheck--flycheck-collect-errors (file-section) 278 | "Collect errors for FILE-SECTION." 279 | (let* ((filename (oref file-section value)) 280 | (errors (magit-diff-flycheck--get-errors filename)) 281 | (filtered (magit-diff-flycheck--filter-errors errors file-section))) 282 | (setq magit-diff-flycheck--current-errors 283 | (append magit-diff-flycheck--current-errors filtered)) 284 | (flycheck-error-list-refresh) 285 | (magit-diff-flycheck--cleanup))) 286 | 287 | (defun magit-diff-flycheck--running-p () 288 | "Return non-nil if the checkers are running. 289 | 290 | This will return non-nil if any checkers has not been checked." 291 | (/= magit-diff-flycheck--checked 292 | (length magit-diff-flycheck--file-sections))) 293 | 294 | (defun magit-diff-flycheck--error-list-entries () 295 | "Create the entries for the error list." 296 | (let ((filtered (flycheck-error-list-apply-filter 297 | magit-diff-flycheck--current-errors))) 298 | (seq-map #'flycheck-error-list-make-entry filtered))) 299 | 300 | (define-derived-mode magit-diff-flycheck-error-list-mode flycheck-error-list-mode 301 | "Flycheck errors" 302 | "Major mode for listing Flycheck errors. 303 | 304 | \\{flycheck-error-list-mode-map}" 305 | (setq tabulated-list-format magit-diff-flycheck--error-list-format 306 | tabulated-list-sort-key (cons "File" nil) 307 | tabulated-list-padding flycheck-error-list-padding 308 | tabulated-list-entries #'magit-diff-flycheck--error-list-entries 309 | mode-line-buffer-identification flycheck-error-list-mode-line) 310 | (advice-add #'flycheck-jump-to-error 311 | :around #'magit-diff-flycheck--remove-filename) 312 | (tabulated-list-init-header)) 313 | 314 | ;;;; Footer 315 | 316 | (provide 'magit-diff-flycheck) 317 | 318 | ;;; magit-diff-flycheck.el ends here 319 | --------------------------------------------------------------------------------