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1 ;;; executable.el --- base functionality for executable interpreter scripts
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2
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3 ;; Copyright (C) 1994, 1995, 1996 by Free Software Foundation, Inc.
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4
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5 ;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
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6 ;; Keywords: languages, unix
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; executable.el is used by certain major modes to insert a suitable
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30 ;; #! line at the beginning of the file, if the file does not already
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31 ;; have one.
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32
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33 ;; Unless it has a magic number, a Unix file with executable mode is passed to
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34 ;; a new instance of the running shell (or to a Bourne shell if a csh is
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35 ;; running and the file starts with `:'). Only a shell can start such a file,
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36 ;; exec() cannot, which is why it is important to have a magic number in every
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37 ;; executable script. Such a magic number is made up by the characters `#!'
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38 ;; the filename of an interpreter (in COFF, ELF or somesuch format) and one
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39 ;; optional argument.
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40
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41 ;; This library is for certain major modes like sh-, awk-, perl-, tcl- or
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42 ;; makefile-mode to insert or update a suitable #! line at the beginning of
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43 ;; the file, if the file does not already have one and the file is not a
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44 ;; default file of that interpreter (like .profile or makefile). It also
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45 ;; makes the file executable if it wasn't, as soon as it's saved.
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46
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47 ;; It also allows debugging scripts, with an adaptation of compile, as far
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48 ;; as interpreters give out meaningful error messages.
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49
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50 ;; Modes that use this should nconc `executable-map' to the end of their own
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51 ;; keymap and `executable-font-lock-keywords' to the end of their own font
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52 ;; lock keywords. Their mode-setting commands should call
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53 ;; `executable-set-magic'.
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54
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55 ;;; Code:
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56
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57 (defvar executable-insert 'not-modified
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58 "*What to do when newly found file has no or wrong magic number:
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59 nil do nothing
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60 t insert or update magic number
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61 other insert or update magic number, but mark as unmodified.
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62 When the insertion is marked as unmodified, you can save it with \\[write-file] RET.
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63 This variable is used when `executable-set-magic' is called as a function,
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64 e.g. when Emacs sets some Un*x interpreter script mode.
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65 With \\[executable-set-magic], this is always treated as if it were `t'.")
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66
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67
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68 (defvar executable-query 'function
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69 "*If non-`nil', ask user before inserting or changing magic number.
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70 When this is `function', only ask when called non-interactively.")
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71
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72
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73 (defvar executable-magicless-file-regexp "/[Mm]akefile$\\|/\\.\\(z?profile\\|bash_profile\\|z?login\\|bash_login\\|z?logout\\|bash_logout\\|.+shrc\\|esrc\\|rcrc\\|[kz]shenv\\)$"
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74 "*On files with this kind of name no magic is inserted or changed.")
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75
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76
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77 (defvar executable-prefix "#! "
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78 "*Interpreter magic number prefix inserted when there was no magic number.")
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79
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80
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81
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82 (defvar executable-chmod 73
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83 "*After saving, if the file is not executable, set this mode.
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84 This mode passed to `set-file-modes' is taken absolutely when negative, or
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85 relative to the files existing modes. Do nothing if this is nil.
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86 Typical values are 73 (+x) or -493 (rwxr-xr-x).")
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87
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88
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89 (defvar executable-command nil)
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90
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91 (defvar executable-self-display "tail"
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92 "*Command you use with argument `+2' to make text files self-display.
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93 Note that the like of `more' doesn't work too well under Emacs \\[shell].")
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94
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95
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96 (defvar executable-font-lock-keywords
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97 '(("\\`#!.*/\\([^ \t\n]+\\)" 1 font-lock-keyword-face t))
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98 "*Rules for highlighting executable scripts' magic number.
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99 This can be included in `font-lock-keywords' by modes that call `executable'.")
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100
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101
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102 (defvar executable-error-regexp-alist
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103 '(;; /bin/xyz: syntax error at line 14: `(' unexpected
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104 ;; /bin/xyz[5]: syntax error at line 8 : ``' unmatched
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105 ("^\\(.*[^[/]\\)\\(\\[[0-9]+\\]\\)?: .* error .* line \\([0-9]+\\)" 1 3)
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106 ;; /bin/xyz[27]: ehco: not found
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107 ("^\\(.*[^/]\\)\\[\\([0-9]+\\)\\]: .*: " 1 2)
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108 ;; /bin/xyz: syntax error near unexpected token `)'
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109 ;; /bin/xyz: /bin/xyz: line 2: `)'
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110 ("^\\(.*[^/]\\): [^0-9\n]+\n\\1: \\1: line \\([0-9]+\\):" 1 2)
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111 ;; /usr/bin/awk: syntax error at line 5 of file /bin/xyz
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112 (" error .* line \\([0-9]+\\) of file \\(.+\\)$" 2 1)
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113 ;; /usr/bin/awk: calling undefined function toto
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114 ;; input record number 3, file awktestdata
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115 ;; source line 4 of file /bin/xyz
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116 ("^[^ ].+\n\\( .+\n\\)* line \\([0-9]+\\) of file \\(.+\\)$" 3 2)
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117 ;; makefile:1: *** target pattern contains no `%'. Stop.
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118 ("^\\(.+\\):\\([0-9]+\\): " 1 2))
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119 "Alist of regexps used to match script errors.
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120 See `compilation-error-regexp-alist'.")
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121
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122 ;; The C function openp slightly modified would do the trick fine
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123 (defun executable-find (command)
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124 "Search for COMMAND in exec-path and return the absolute file name.
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125 Return nil if COMMAND is not found anywhere in `exec-path'."
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126 (let ((list exec-path)
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127 file)
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128 (while list
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129 (setq list (if (and (setq file (expand-file-name command (car list)))
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130 (file-executable-p file)
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131 (not (file-directory-p file)))
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132 nil
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133 (setq file nil)
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134 (cdr list))))
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135 file))
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136
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137
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138 (defun executable-chmod ()
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139 "This gets called after saving a file to assure that it be executable.
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140 You can set the absolute or relative mode in variable `executable-chmod' for
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141 non-executable files."
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142 (and executable-chmod
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143 buffer-file-name
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144 (or (file-executable-p buffer-file-name)
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145 (set-file-modes buffer-file-name
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146 (if (< executable-chmod 0)
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147 (- executable-chmod)
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148 (logior executable-chmod
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149 (file-modes buffer-file-name)))))))
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150
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151
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152 (defun executable-interpret (command)
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153 "Run script with user-specified args, and collect output in a buffer.
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154 While script runs asynchronously, you can use the \\[next-error] command
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155 to find the next error."
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156 (interactive (list (read-string "Run script: "
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157 (or executable-command
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158 buffer-file-name))))
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159 (require 'compile)
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160 (save-some-buffers (not compilation-ask-about-save))
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161 (make-local-variable 'executable-command)
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162 (compile-internal (setq executable-command command)
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163 "No more errors." "Interpretation"
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164 ;; Give it a simpler regexp to match.
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165 nil executable-error-regexp-alist))
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166
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167
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168
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169 ;;;###autoload
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170 (defun executable-set-magic (interpreter &optional argument
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171 no-query-flag insert-flag)
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172 "Set this buffer's interpreter to INTERPRETER with optional ARGUMENT.
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173 The variables `executable-magicless-file-regexp', `executable-prefix',
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174 `executable-insert', `executable-query' and `executable-chmod' control
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175 when and how magic numbers are inserted or replaced and scripts made
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176 executable."
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177 (interactive
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178 (let* ((name (read-string "Name or file name of interpreter: "))
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179 (arg (read-string (format "Argument for %s: " name))))
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180 (list name arg (eq executable-query 'function) t)))
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181 (setq interpreter (if (file-name-absolute-p interpreter)
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182 interpreter
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183 (or (executable-find interpreter)
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184 (error "Interpreter %s not recognized" interpreter)))
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185 argument (concat interpreter
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186 (and argument (string< "" argument) " ")
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187 argument))
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188 (or buffer-read-only
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189 (if buffer-file-name
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190 (string-match executable-magicless-file-regexp
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191 buffer-file-name))
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192 (not (or insert-flag executable-insert))
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193 (> (point-min) 1)
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194 (save-excursion
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195 (let ((point (point-marker))
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196 (buffer-modified-p (buffer-modified-p)))
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197 (goto-char (point-min))
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198 (make-local-hook 'after-save-hook)
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199 (add-hook 'after-save-hook 'executable-chmod nil t)
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200 (if (looking-at "#![ \t]*\\(.*\\)$")
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201 (and (goto-char (match-beginning 1))
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202 ;; If the line ends in a space,
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203 ;; don't offer to change it.
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204 (not (= (char-after (1- (match-end 1))) ?\ ))
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205 (not (string= argument
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206 (buffer-substring (point) (match-end 1))))
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207 (if (or (not executable-query) no-query-flag
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208 (save-window-excursion
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209 ;; Make buffer visible before question.
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210 (switch-to-buffer (current-buffer))
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211 (y-or-n-p (concat "Replace magic number by `"
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212 executable-prefix argument "'? "))))
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213 (progn
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214 (replace-match argument t t nil 1)
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215 (message "Magic number changed to `%s'"
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216 (concat executable-prefix argument)))))
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217 (insert executable-prefix argument ?\n)
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218 (message "Magic number changed to `%s'"
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219 (concat executable-prefix argument)))
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220 ;;; (or insert-flag
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221 ;;; (eq executable-insert t)
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222 ;;; (set-buffer-modified-p buffer-modified-p))
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223 )))
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224 interpreter)
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225
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226
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227
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228 ;;;###autoload
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229 (defun executable-self-display ()
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230 "Turn a text file into a self-displaying Un*x command.
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231 The magic number of such a command displays all lines but itself."
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232 (interactive)
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233 (if (eq this-command 'executable-self-display)
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234 (setq this-command 'executable-set-magic))
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235 (executable-set-magic executable-self-display "+2"))
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236
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237
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238
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239 (provide 'executable)
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240
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241 ;; executable.el ends here
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242
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243
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