Add fix-shebang.

3 files changed, 99 insertions, 1 deletions

diff --git a/debian/control b/debian/control
index 936dbb6..a39ff5d 100644
--- a/debian/control
+++ b/debian/control
@@ -8,7 +8,8 @@ Homepage: http://liw.fi/extrautils/
 
 Package: extrautils
 Architecture: any
-Depends: python (>= 2.5), ${shlibs:Depends}, ${misc:Depends}
+Depends: python (>= 2.5), ${shlibs:Depends}, ${misc:Depends},
+    python-cliapp
 Description: collection of miscellaneous Unix command line utilities
  This is a collection of miscellaneous utilities for the Unix command
  line, inspired by Joey Hess's moreutils. The inclusion criteria for
diff --git a/fix-shebang b/fix-shebang
new file mode 100755
index 0000000..6d78bb0
--- /dev/null
+++ b/fix-shebang
@@ -0,0 +1,52 @@
+#!/usr/bin/python
+# Copyright 2011  Lars Wirzenius
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import cliapp
+import os
+import tempfile
+
+
+class FixShebang(cliapp.Application):
+
+    def add_settings(self):
+        self.add_string_setting(['shebang'], 'interpreter path and args')
+
+    def process_input(self, arg):
+        name = self.create_tempfile_for(arg)
+        temp = open(name, 'w')
+        shebang = self['shebang']
+        if not shebang.startswith('#!'):
+            shebang = '#!%s' % shebang
+        temp.write('%s\n' % shebang)
+        f = open(arg)
+        line1 = f.readline()
+        if line1 and not line1.startswith('#!'):
+            temp.write(line1)
+        for line in f:
+            temp.write(line)
+        f.close()
+        temp.close()
+        os.rename(name, arg)
+        
+    def create_tempfile_for(self, filename):
+        fd, name = tempfile.mkstemp(dir=os.path.dirname(filename))
+        os.close(fd)
+        return name
+
+
+if __name__ == '__main__':
+    FixShebang().run()
diff --git a/fix-shebang.1 b/fix-shebang.1
new file mode 100644
index 0000000..664e8e6
--- /dev/null
+++ b/fix-shebang.1
@@ -0,0 +1,45 @@
+.\" Copyright 2011 Lars Wirzenius <liw@liw.fi>
+.\" 
+.\" This program is free software: you can redistribute it and/or modify
+.\" it under the terms of the GNU General Public License as published by
+.\" the Free Software Foundation, either version 3 of the License, or
+.\" (at your option) any later version.
+.\" 
+.\" This program is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+.\" GNU General Public License for more details.
+.\" 
+.\" You should have received a copy of the GNU General Public License
+.\" along with this program.  If not, see <http://www.gnu.org/licenses/>.
+.\"
+.TH FIX-SHEBANG 1
+.SH NAME
+fix-shebang \- set the #! line for scripts
+.SH SYNOPSIS
+.B fix-shebang
+.RB [ \-\-shebang\fR=\fIinterp ]
+.IR file ...
+.SH DESCRIPTION
+.B fix-shebang
+sets the interpreter or 
+.I shebang
+line for script files.
+This is the line that starts with
+.R #!
+at the beginning of on the first line.
+For example, typically a shell script would be
+.sp 1
+.RS
+#!/bin/sh
+.RE
+.sp 1
+For other interpreters, such as Python or Perl or Ruby,
+it may be necessary to change the interpreter on different systems.
+.B fix-shebang
+makes that easy.
+.SH OPTIONS
+.TP
+.BR \-\-shebang =\fIinterpreter
+Set the interpreter to be 
+.BR #!\fIinterpreter .