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1 ;;; mercurial.el --- Emacs support for the Mercurial distributed SCM |
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2 |
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3 ;; Copyright (C) 2005 Bryan O'Sullivan |
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4 |
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5 ;; Author: Bryan O'Sullivan <bos@serpentine.com> |
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6 |
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7 ;; $Id$ |
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8 |
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9 ;; mercurial.el is free software; you can redistribute it and/or |
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10 ;; modify it under the terms of version 2 of the GNU General Public |
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11 ;; License as published by the Free Software Foundation. |
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12 |
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13 ;; mercurial.el is distributed in the hope that it will be useful, but |
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14 ;; WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 ;; General Public License for more details. |
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17 |
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18 ;; You should have received a copy of the GNU General Public License |
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19 ;; along with mercurial.el, GNU Emacs, or XEmacs; see the file COPYING |
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20 ;; (`C-h C-l'). If not, write to the Free Software Foundation, Inc., |
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21 ;; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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22 |
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23 ;;; Commentary: |
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24 |
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25 ;; This mode builds upon Emacs's VC mode to provide flexible |
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26 ;; integration with the Mercurial distributed SCM tool. |
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27 |
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28 ;; To get going as quickly as possible, load mercurial.el into Emacs and |
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29 ;; type `C-c h h'; this runs hg-help-overview, which prints a helpful |
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30 ;; usage overview. |
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31 |
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32 ;; Much of the inspiration for mercurial.el comes from Rajesh |
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33 ;; Vaidheeswarran's excellent p4.el, which does an admirably thorough |
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34 ;; job for the commercial Perforce SCM product. In fact, substantial |
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35 ;; chunks of code are adapted from p4.el. |
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36 |
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37 ;; This code has been developed under XEmacs 21.5, and may will not |
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38 ;; work as well under GNU Emacs (albeit tested under 21.2). Patches |
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39 ;; to enhance the portability of this code, fix bugs, and add features |
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40 ;; are most welcome. You can clone a Mercurial repository for this |
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41 ;; package from http://www.serpentine.com/hg/hg-emacs |
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42 |
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43 ;; Please send problem reports and suggestions to bos@serpentine.com. |
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44 |
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45 |
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46 ;;; Code: |
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47 |
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48 (require 'advice) |
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49 (require 'cl) |
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50 (require 'diff-mode) |
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51 (require 'easymenu) |
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52 (require 'vc) |
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53 |
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54 |
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55 ;;; XEmacs has view-less, while GNU Emacs has view. Joy. |
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56 |
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57 (condition-case nil |
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58 (require 'view-less) |
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59 (error nil)) |
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60 (condition-case nil |
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61 (require 'view) |
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62 (error nil)) |
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63 |
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64 |
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65 ;;; Variables accessible through the custom system. |
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66 |
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67 (defgroup mercurial nil |
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68 "Mercurial distributed SCM." |
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69 :group 'tools) |
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70 |
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71 (defcustom hg-binary |
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72 (dolist (path '("~/bin/hg" |
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73 "/usr/bin/hg" |
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74 "/usr/local/bin/hg")) |
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75 (when (file-executable-p path) |
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76 (return path))) |
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77 "The path to Mercurial's hg executable." |
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78 :type '(file :must-match t) |
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79 :group 'mercurial) |
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80 |
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81 (defcustom hg-mode-hook nil |
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82 "Hook run when a buffer enters hg-mode." |
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83 :type 'sexp |
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84 :group 'mercurial) |
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85 |
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86 (defcustom hg-global-prefix "\C-ch" |
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87 "The global prefix for Mercurial keymap bindings." |
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88 :type 'sexp |
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89 :group 'mercurial) |
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90 |
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91 (defcustom hg-rev-completion-limit 100 |
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92 "The maximum number of revisions that hg-read-rev will offer to complete. |
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93 This affects memory usage and performance when prompting for revisions |
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94 in a repository with a lot of history." |
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95 :type 'integer |
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96 :group 'mercurial) |
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97 |
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98 (defcustom hg-log-limit 50 |
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99 "The maximum number of revisions that hg-log will display." |
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100 :type 'integer |
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101 :group 'mercurial) |
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102 |
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103 |
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104 ;;; Other variables. |
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105 |
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106 (defconst hg-running-xemacs (string-match "XEmacs" emacs-version) |
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107 "Is mercurial.el running under XEmacs?") |
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108 |
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109 (defvar hg-mode nil |
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110 "Is this file managed by Mercurial?") |
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111 (make-variable-buffer-local 'hg-mode) |
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112 (put 'hg-mode 'permanent-local t) |
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113 |
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114 (defvar hg-status nil) |
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115 (make-variable-buffer-local 'hg-status) |
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116 (put 'hg-status 'permanent-local t) |
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117 |
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118 (defvar hg-output-buffer-name "*Hg*" |
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119 "The name to use for Mercurial output buffers.") |
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120 |
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121 (defvar hg-file-history nil) |
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122 (defvar hg-rev-history nil) |
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123 |
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124 |
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125 ;;; hg-mode keymap. |
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126 |
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127 (defvar hg-prefix-map |
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128 (let ((map (copy-keymap vc-prefix-map))) |
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129 (set-keymap-name map 'hg-prefix-map) |
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130 map) |
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131 "This keymap overrides some default vc-mode bindings.") |
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132 (fset 'hg-prefix-map hg-prefix-map) |
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133 (define-key hg-prefix-map "=" 'hg-diff) |
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134 (define-key hg-prefix-map "c" 'hg-undo) |
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135 (define-key hg-prefix-map "g" 'hg-annotate) |
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136 (define-key hg-prefix-map "l" 'hg-log) |
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137 (define-key hg-prefix-map "n" 'hg-commit-file) |
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138 ;; (define-key hg-prefix-map "r" 'hg-update) |
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139 (define-key hg-prefix-map "u" 'hg-revert-file) |
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140 (define-key hg-prefix-map "~" 'hg-version-other-window) |
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141 |
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142 (defvar hg-mode-map (make-sparse-keymap)) |
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143 (define-key hg-mode-map "\C-xv" 'hg-prefix-map) |
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144 |
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145 (add-minor-mode 'hg-mode 'hg-mode hg-mode-map) |
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146 |
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147 |
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148 ;;; Global keymap. |
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149 |
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150 (global-set-key "\C-xvi" 'hg-add) |
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151 |
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152 (defvar hg-global-map (make-sparse-keymap)) |
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153 (fset 'hg-global-map hg-global-map) |
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154 (global-set-key hg-global-prefix 'hg-global-map) |
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155 (define-key hg-global-map "," 'hg-incoming) |
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156 (define-key hg-global-map "." 'hg-outgoing) |
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157 (define-key hg-global-map "<" 'hg-pull) |
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158 (define-key hg-global-map "=" 'hg-diff) |
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159 (define-key hg-global-map ">" 'hg-push) |
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160 (define-key hg-global-map "?" 'hg-help-overview) |
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161 (define-key hg-global-map "A" 'hg-addremove) |
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162 (define-key hg-global-map "U" 'hg-revert) |
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163 (define-key hg-global-map "a" 'hg-add) |
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164 (define-key hg-global-map "c" 'hg-commit) |
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165 (define-key hg-global-map "f" 'hg-forget) |
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166 (define-key hg-global-map "h" 'hg-help-overview) |
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167 (define-key hg-global-map "i" 'hg-init) |
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168 (define-key hg-global-map "l" 'hg-log) |
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169 (define-key hg-global-map "r" 'hg-root) |
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170 (define-key hg-global-map "s" 'hg-status) |
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171 (define-key hg-global-map "u" 'hg-update) |
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172 |
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173 |
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174 ;;; View mode keymap. |
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175 |
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176 (defvar hg-view-mode-map |
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177 (let ((map (copy-keymap (if (boundp 'view-minor-mode-map) |
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178 view-minor-mode-map |
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179 view-mode-map)))) |
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180 (set-keymap-name map 'hg-view-mode-map) |
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181 map)) |
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182 (fset 'hg-view-mode-map hg-view-mode-map) |
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183 (define-key hg-view-mode-map |
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184 (if hg-running-xemacs [button2] [mouse-2]) |
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185 'hg-buffer-mouse-clicked) |
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186 |
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187 |
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188 ;;; Convenience functions. |
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189 |
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190 (defun hg-binary () |
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191 (if hg-binary |
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192 hg-binary |
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193 (error "No `hg' executable found!"))) |
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194 |
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195 (defun hg-replace-in-string (str regexp newtext &optional literal) |
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196 "Replace all matches in STR for REGEXP with NEWTEXT string. |
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197 Return the new string. Optional LITERAL non-nil means do a literal |
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198 replacement. |
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199 |
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200 This function bridges yet another pointless impedance gap between |
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201 XEmacs and GNU Emacs." |
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202 (if (fboundp 'replace-in-string) |
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203 (replace-in-string str regexp newtext literal) |
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204 (replace-regexp-in-string regexp newtext str nil literal))) |
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205 |
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206 (defun hg-chomp (str) |
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207 "Strip trailing newlines from a string." |
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208 (hg-replace-in-string str "[\r\n]+$" "")) |
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209 |
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210 (defun hg-run-command (command &rest args) |
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211 "Run the shell command COMMAND, returning (EXIT-CODE . COMMAND-OUTPUT). |
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212 The list ARGS contains a list of arguments to pass to the command." |
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213 (let* (exit-code |
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214 (output |
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215 (with-output-to-string |
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216 (with-current-buffer |
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217 standard-output |
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218 (setq exit-code |
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219 (apply 'call-process command nil t nil args)))))) |
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220 (cons exit-code output))) |
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221 |
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222 (defun hg-run (command &rest args) |
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223 "Run the Mercurial command COMMAND, returning (EXIT-CODE . COMMAND-OUTPUT)." |
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224 (apply 'hg-run-command (hg-binary) command args)) |
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225 |
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226 (defun hg-run0 (command &rest args) |
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227 "Run the Mercurial command COMMAND, returning its output. |
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228 If the command does not exit with a zero status code, raise an error." |
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229 (let ((res (apply 'hg-run-command (hg-binary) command args))) |
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230 (if (not (eq (car res) 0)) |
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231 (error "Mercurial command failed %s - exit code %s" |
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232 (cons command args) |
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233 (car res)) |
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234 (cdr res)))) |
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235 |
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236 (defun hg-buffer-commands (pnt) |
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237 "Use the properties of a character to do something sensible." |
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238 (interactive "d") |
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239 (let ((rev (get-char-property pnt 'rev)) |
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240 (file (get-char-property pnt 'file)) |
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241 (date (get-char-property pnt 'date)) |
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242 (user (get-char-property pnt 'user)) |
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243 (host (get-char-property pnt 'host)) |
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244 (prev-buf (current-buffer))) |
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245 (cond |
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246 (file |
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247 (find-file-other-window file)) |
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248 (rev |
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249 (hg-diff hg-view-file-name rev rev prev-buf)) |
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250 ((message "I don't know how to do that yet"))))) |
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251 |
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252 (defun hg-buffer-mouse-clicked (event) |
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253 "Translate the mouse clicks in a HG log buffer to character events. |
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254 These are then handed off to `hg-buffer-commands'. |
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255 |
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256 Handle frickin' frackin' gratuitous event-related incompatibilities." |
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257 (interactive "e") |
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258 (if hg-running-xemacs |
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259 (progn |
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260 (select-window (event-window event)) |
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261 (hg-buffer-commands (event-point event))) |
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262 (select-window (posn-window (event-end event))) |
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263 (hg-buffer-commands (posn-point (event-start event))))) |
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264 |
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265 (unless (fboundp 'view-minor-mode) |
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266 (defun view-minor-mode (prev-buffer exit-func) |
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267 (view-mode))) |
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268 |
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269 (defun hg-abbrev-file-name (file) |
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270 (if hg-running-xemacs |
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271 (abbreviate-file-name file t) |
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272 (abbreviate-file-name file))) |
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273 |
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274 (defun hg-read-file-name (&optional prompt default) |
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275 "Read a file or directory name, or a pattern, to use with a command." |
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276 (let ((path (or default (buffer-file-name)))) |
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277 (if (or (not path) current-prefix-arg) |
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278 (expand-file-name |
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279 (read-file-name (format "File, directory or pattern%s: " |
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280 (or prompt "")) |
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281 (and path (file-name-directory path)) |
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282 nil nil |
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283 (and path (file-name-nondirectory path)) |
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284 'hg-file-history)) |
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285 path))) |
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286 |
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287 (defun hg-read-rev (&optional prompt default) |
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288 "Read a revision or tag, offering completions." |
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289 (let ((rev (or default "tip"))) |
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290 (if (or (not rev) current-prefix-arg) |
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291 (let ((revs (split-string (hg-chomp |
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292 (hg-run0 "-q" "log" "-r" |
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293 (format "-%d" |
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294 hg-rev-completion-limit) |
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295 "-r" "tip")) |
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296 "[\n:]"))) |
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297 (dolist (line (split-string (hg-chomp (hg-run0 "tags")) "\n")) |
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298 (setq revs (cons (car (split-string line "\\s-")) revs))) |
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299 (completing-read (format "Revision%s (%s): " |
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300 (or prompt "") |
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301 (or default "tip")) |
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302 (map 'list 'cons revs revs) |
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303 nil |
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304 nil |
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305 nil |
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306 'hg-rev-history |
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307 (or default "tip"))) |
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308 rev))) |
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309 |
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310 ;;; View mode bits. |
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311 |
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312 (defun hg-exit-view-mode (buf) |
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313 "Exit from hg-view-mode. |
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314 We delete the current window if entering hg-view-mode split the |
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315 current frame." |
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316 (when (and (eq buf (current-buffer)) |
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317 (> (length (window-list)) 1)) |
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318 (delete-window)) |
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319 (when (buffer-live-p buf) |
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320 (kill-buffer buf))) |
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321 |
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322 (defun hg-view-mode (prev-buffer &optional file-name) |
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323 (goto-char (point-min)) |
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324 (set-buffer-modified-p nil) |
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325 (toggle-read-only t) |
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326 (view-minor-mode prev-buffer 'hg-exit-view-mode) |
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327 (use-local-map hg-view-mode-map) |
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328 (setq truncate-lines t) |
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329 (when file-name |
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330 (set (make-local-variable 'hg-view-file-name) |
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331 (hg-abbrev-file-name file-name)))) |
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332 |
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333 (defun hg-file-status (file) |
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334 "Return status of FILE, or nil if FILE does not exist or is unmanaged." |
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335 (let* ((s (hg-run "status" file)) |
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336 (exit (car s)) |
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337 (output (cdr s))) |
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338 (if (= exit 0) |
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339 (let ((state (assoc (substring output 0 (min (length output) 2)) |
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340 '(("M " . modified) |
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341 ("A " . added) |
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342 ("R " . removed))))) |
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343 (if state |
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344 (cdr state) |
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345 'normal))))) |
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346 |
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347 (defun hg-tip () |
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348 (split-string (hg-chomp (hg-run0 "-q" "tip")) ":")) |
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349 |
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350 (defmacro hg-view-output (args &rest body) |
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351 "Execute BODY in a clean buffer, then quickly display that buffer. |
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352 If the buffer contains one line, its contents are displayed in the |
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353 minibuffer. Otherwise, the buffer is displayed in view-mode. |
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354 ARGS is of the form (BUFFER-NAME &optional FILE), where BUFFER-NAME is |
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355 the name of the buffer to create, and FILE is the name of the file |
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356 being viewed." |
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357 (let ((prev-buf (gensym "prev-buf-")) |
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358 (v-b-name (car args)) |
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359 (v-m-rest (cdr args))) |
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360 `(let ((view-buf-name ,v-b-name) |
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361 (,prev-buf (current-buffer))) |
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362 (get-buffer-create view-buf-name) |
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363 (kill-buffer view-buf-name) |
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364 (get-buffer-create view-buf-name) |
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365 (set-buffer view-buf-name) |
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366 (save-excursion |
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367 ,@body) |
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368 (case (count-lines (point-min) (point-max)) |
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369 ((0) |
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370 (kill-buffer view-buf-name) |
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371 (message "(No output)")) |
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372 ((1) |
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373 (let ((msg (hg-chomp (buffer-substring (point-min) (point-max))))) |
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374 (kill-buffer view-buf-name) |
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375 (message "%s" msg))) |
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376 (t |
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377 (pop-to-buffer view-buf-name) |
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378 (hg-view-mode ,prev-buf ,@v-m-rest)))))) |
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379 |
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380 (put 'hg-view-output 'lisp-indent-function 1) |
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381 |
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382 ;;; Hooks. |
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383 |
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384 (defun hg-mode-line () |
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385 (when (hg-root) |
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386 (let ((status (hg-file-status buffer-file-name))) |
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387 (setq hg-status status |
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388 hg-mode (and status (concat " Hg:" |
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389 (car (hg-tip)) |
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390 (cdr (assq status |
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391 '((normal . "") |
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392 (removed . "r") |
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393 (added . "a") |
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394 (modified . "m"))))))) |
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395 status))) |
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396 |
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397 (defun hg-find-file-hook () |
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398 (when (hg-mode-line) |
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399 (run-hooks 'hg-mode-hook))) |
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400 |
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401 (add-hook 'find-file-hooks 'hg-find-file-hook) |
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402 |
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403 (defun hg-after-save-hook () |
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404 (let ((old-status hg-status)) |
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405 (hg-mode-line) |
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406 (if (and (not old-status) hg-status) |
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407 (run-hooks 'hg-mode-hook)))) |
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408 |
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409 (add-hook 'after-save-hook 'hg-after-save-hook) |
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410 |
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411 |
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412 ;;; User interface functions. |
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413 |
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414 (defun hg-help-overview () |
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415 "This is an overview of the Mercurial SCM mode for Emacs. |
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416 |
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417 You can find the source code, license (GPL v2), and credits for this |
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418 code by typing `M-x find-library mercurial RET'. |
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419 |
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420 The Mercurial mode user interface is based on that of the older VC |
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421 mode, so if you're already familiar with VC, the same keybindings and |
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422 functions will generally work. |
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423 |
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424 Below is a list of common SCM tasks, with the key bindings needed to |
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425 perform them, and the command names. This list is not exhaustive. |
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426 |
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427 In the list below, `G/L' indicates whether a key binding is global (G) |
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428 or local (L). Global keybindings work on any file inside a Mercurial |
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429 repository. Local keybindings only apply to files under the control |
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430 of Mercurial. Many commands take a prefix argument. |
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431 |
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432 |
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433 SCM Task G/L Key Binding Command Name |
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434 -------- --- ----------- ------------ |
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435 Help overview (what you are reading) G C-c h h hg-help-overview |
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436 |
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437 Tell Mercurial to manage a file G C-c h a hg-add |
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438 Commit changes to current file only L C-x v n hg-commit |
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439 Undo changes to file since commit L C-x v u hg-revert-file |
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440 |
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441 Diff file vs last checkin L C-x v = hg-diff |
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442 |
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443 View file change history L C-x v l hg-log |
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444 View annotated file L C-x v a hg-annotate |
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445 |
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446 Diff repo vs last checkin G C-c h = hg-diff |
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447 View status of files in repo G C-c h s hg-status |
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448 Commit all changes G C-c h c hg-commit |
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449 |
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450 Undo all changes since last commit G C-c h U hg-revert |
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451 View repo change history G C-c h l hg-log |
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452 |
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453 See changes that can be pulled G C-c h , hg-incoming |
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454 Pull changes G C-c h < hg-pull |
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455 Update working directory after pull G C-c h u hg-update |
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456 See changes that can be pushed G C-c h . hg-outgoing |
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457 Push changes G C-c h > hg-push" |
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458 (interactive) |
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459 (hg-view-output ("Mercurial Help Overview") |
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460 (insert (documentation 'hg-help-overview)))) |
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461 |
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462 (defun hg-add (path) |
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463 (interactive (list (hg-read-file-name " to add"))) |
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464 (let ((buf (current-buffer)) |
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465 (update (equal buffer-file-name path))) |
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466 (hg-view-output (hg-output-buffer-name) |
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467 (apply 'call-process (hg-binary) nil t nil (list "add" path))) |
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468 (when update |
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469 (with-current-buffer buf |
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470 (hg-mode-line))))) |
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471 |
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472 (defun hg-addremove () |
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473 (interactive) |
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474 (error "not implemented")) |
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475 |
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476 (defun hg-annotate () |
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477 (interactive) |
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478 (error "not implemented")) |
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479 |
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480 (defun hg-commit () |
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481 (interactive) |
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482 (error "not implemented")) |
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483 |
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484 (defun hg-diff (path &optional rev1 rev2) |
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485 (interactive (list (hg-read-file-name " to diff") |
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486 (hg-read-rev " to start with") |
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487 (let ((rev2 (hg-read-rev " to end with" 'working-dir))) |
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488 (and (not (eq rev2 'working-dir)) rev2)))) |
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489 (let ((a-path (hg-abbrev-file-name path))) |
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490 (hg-view-output ((if (equal rev1 rev2) |
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491 (format "Mercurial: Rev %s of %s" rev1 a-path) |
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492 (format "Mercurial: Rev %s to %s of %s" |
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493 rev1 (or rev2 "Current") a-path))) |
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494 (if rev2 |
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495 (call-process (hg-binary) nil t nil "diff" "-r" rev1 "-r" rev2 path) |
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496 (call-process (hg-binary) nil t nil "diff" "-r" rev1 path)) |
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497 (diff-mode) |
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498 (font-lock-fontify-buffer)))) |
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499 |
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500 (defun hg-forget (path) |
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501 (interactive (list (hg-read-file-name " to forget"))) |
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502 (let ((buf (current-buffer)) |
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503 (update (equal buffer-file-name path))) |
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504 (hg-view-output (hg-output-buffer-name) |
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505 (apply 'call-process (hg-binary) nil t nil (list "forget" path))) |
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506 (when update |
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507 (with-current-buffer buf |
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508 (hg-mode-line))))) |
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509 |
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510 (defun hg-incoming () |
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511 (interactive) |
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512 (error "not implemented")) |
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513 |
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514 (defun hg-init () |
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515 (interactive) |
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516 (error "not implemented")) |
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517 |
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518 (defun hg-log (path &optional rev1 rev2) |
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519 (interactive (list (hg-read-file-name " to log") |
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520 (hg-read-rev " to start with" "-1") |
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521 (hg-read-rev " to end with" (format "-%d" hg-log-limit)))) |
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522 (message "log %s %s" rev1 rev2) |
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523 (sit-for 1) |
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524 (let ((a-path (hg-abbrev-file-name path))) |
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525 (hg-view-output ((if (equal rev1 rev2) |
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526 (format "Mercurial: Rev %s of %s" rev1 a-path) |
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527 (format "Mercurial: Rev %s to %s of %s" |
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528 rev1 (or rev2 "Current") a-path))) |
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529 (call-process (hg-binary) nil t nil "log" "-r" rev1 "-r" rev2 path) |
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530 (diff-mode) |
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531 (font-lock-fontify-buffer)))) |
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532 |
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533 (defun hg-outgoing () |
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534 (interactive) |
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535 (error "not implemented")) |
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536 |
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537 (defun hg-pull () |
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538 (interactive) |
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539 (error "not implemented")) |
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540 |
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541 (defun hg-push () |
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542 (interactive) |
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543 (error "not implemented")) |
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544 |
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545 (defun hg-revert () |
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546 (interactive) |
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547 (error "not implemented")) |
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548 |
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549 (defun hg-revert-file () |
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550 (interactive) |
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551 (error "not implemented")) |
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552 |
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553 (defun hg-root (&optional path) |
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554 (interactive (list (hg-read-file-name))) |
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555 (let ((root (do ((prev nil dir) |
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556 (dir (file-name-directory (or path (buffer-file-name))) |
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557 (file-name-directory (directory-file-name dir)))) |
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558 ((equal prev dir)) |
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559 (when (file-directory-p (concat dir ".hg")) |
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560 (return dir))))) |
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561 (when (interactive-p) |
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562 (if root |
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563 (message "The root of this repository is `%s'." root) |
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564 (message "The path `%s' is not in a Mercurial repository." |
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565 (abbreviate-file-name path t)))) |
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566 root)) |
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567 |
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568 (defun hg-status (path) |
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569 (interactive (list (hg-read-file-name " for status" (hg-root)))) |
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570 (let ((root (hg-root))) |
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571 (hg-view-output (hg-output-buffer-name) |
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572 (apply 'call-process (hg-binary) nil t nil |
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573 (list "-C" root "status" path))))) |
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574 |
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575 (defun hg-undo () |
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576 (interactive) |
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577 (error "not implemented")) |
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578 |
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579 (defun hg-version-other-window () |
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580 (interactive) |
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581 (error "not implemented")) |
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582 |
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583 |
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584 (provide 'mercurial) |
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585 |
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586 |
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587 ;;; Local Variables: |
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588 ;;; mode: emacs-lisp |
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589 ;;; prompt-to-byte-compile: nil |
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590 ;;; end: |