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From: Andrea Bolognani <eof@kiyuko.org>
Date: Wed, 1 Feb 2012 11:33:54 +0100
Subject: Make sure external commands are available
External commands are not guaranteed to be available on the
system, so test for their existence before running them.
Forwarded: yes
---
rhinote.py | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/rhinote.py b/rhinote.py
index 93e2363..376cb2c 100644
--- a/rhinote.py
+++ b/rhinote.py
@@ -83,12 +83,18 @@ class TextWidget(tkinter.Text):
Rhinote()
def printfile(self, whatever=None):
+ if not self.printcommand:
+ tkMessageBox.showerror('Print error', 'Print command (lpr) not found')
+ return
+ if not self.formatcommand:
+ tkMessageBox.showerror('Print error', 'Format command (enscript) not found')
+ return
f = open(self.printfilename, 'w')
f.write(self.get('1.0', 'end'))
f.close
# 'enscript' formats the text; lpr sends it to the default printer;
# enscript's -B option suppresses page headers.
- os.system('enscript -B --word-wrap $HOME/.Rhinoteprintfile > lpr &')
+ os.system('%s -B --word-wrap %s > %s &' % (self.formatcommand, self.printfilename, self.printcommand))
def help(self, whatever=None):
tkMessageBox.showinfo('Rhinote Help', message='''
@@ -114,6 +120,23 @@ Free Software distributed under the GNU General Public License
http://rhinote.tuxfamily.org
''')
+ def which(self, cmd):
+ # Abort immediately if PATH is not set
+ path = os.getenv('PATH')
+ if not path:
+ return None
+ # Look in all directories listed in PATH
+ dirs = path.split(os.pathsep)
+ path = None
+ for d in dirs:
+ f = os.path.join(d, cmd)
+ # f must be an executable file
+ if os.path.isfile(f) and os.access(f, os.X_OK):
+ # Stop after the first success
+ path = f
+ break
+ return path
+
def __init__(self, master, **kw):
tkinter.Text.__init__(self, master, **kw)
self.bind('<Control-n>', self.new_window)
@@ -136,6 +159,9 @@ http://rhinote.tuxfamily.org
('Rhinote files', '*.rhi'),
('All files', '*'),
]
+ # Find print and format commands
+ self.printcommand = self.which('lpr')
+ self.formatcommand = self.which('enscript')
# make it so:
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