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+# Bugs Everywhere, a distributed bugtracker
+# Copyright (C) 2008-2009 W. Trevor King <wking@drexel.edu>
+#
+# 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 2 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, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+import codecs
+import locale
+import os
+import sys
+import tempfile
+import doctest
+
+default_encoding = sys.getfilesystemencoding() or locale.getpreferredencoding()
+
+comment_marker = u"== Anything below this line will be ignored\n"
+
+class CantFindEditor(Exception):
+ def __init__(self):
+ Exception.__init__(self, "Can't find editor to get string from")
+
+def editor_string(comment=None, encoding=None):
+ """Invokes the editor, and returns the user-produced text as a string
+
+ >>> if "EDITOR" in os.environ:
+ ... del os.environ["EDITOR"]
+ >>> if "VISUAL" in os.environ:
+ ... del os.environ["VISUAL"]
+ >>> editor_string()
+ Traceback (most recent call last):
+ CantFindEditor: Can't find editor to get string from
+ >>> os.environ["EDITOR"] = "echo bar > "
+ >>> editor_string()
+ u'bar\\n'
+ >>> os.environ["VISUAL"] = "echo baz > "
+ >>> editor_string()
+ u'baz\\n'
+ >>> del os.environ["EDITOR"]
+ >>> del os.environ["VISUAL"]
+ """
+ if encoding == None:
+ encoding = default_encoding
+ for name in ('VISUAL', 'EDITOR'):
+ try:
+ editor = os.environ[name]
+ break
+ except KeyError:
+ pass
+ else:
+ raise CantFindEditor()
+ fhandle, fname = tempfile.mkstemp()
+ try:
+ if comment is not None:
+ os.write(fhandle, '\n'+comment_string(comment))
+ os.close(fhandle)
+ oldmtime = os.path.getmtime(fname)
+ os.system("%s %s" % (editor, fname))
+ f = codecs.open(fname, "r", encoding)
+ output = trimmed_string(f.read())
+ f.close()
+ if output.rstrip('\n') == "":
+ output = None
+ finally:
+ os.unlink(fname)
+ return output
+
+
+def comment_string(comment):
+ """
+ >>> comment_string('hello') == comment_marker+"hello"
+ True
+ """
+ return comment_marker + comment
+
+
+def trimmed_string(instring):
+ """
+ >>> trimmed_string("hello\\n"+comment_marker)
+ u'hello\\n'
+ >>> trimmed_string("hi!\\n" + comment_string('Booga'))
+ u'hi!\\n'
+ """
+ out = []
+ for line in instring.splitlines(True):
+ if line.startswith(comment_marker):
+ break
+ out.append(line)
+ return ''.join(out)
+
+suite = doctest.DocTestSuite()