From 4c3c4ff03183b914750e889202435bc558933898 Mon Sep 17 00:00:00 2001
From: "James E. Blair" <corvus@gnu.org>
Date: Sun, 20 Nov 2016 10:54:45 -0800
Subject: Fail nicer if figlet/cowsay not installed

If figlet or cowsay are not installed, print a warning at startup
and continue.
---
 presentty/text.py | 54 ++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 36 insertions(+), 18 deletions(-)

diff --git a/presentty/text.py b/presentty/text.py
index e0a88fc..92c0a26 100644
--- a/presentty/text.py
+++ b/presentty/text.py
@@ -29,15 +29,24 @@ class FigletText(urwid.WidgetWrap):
         super(FigletText, self).__init__(widget)
 
     def _run(self):
-        p = subprocess.Popen(['figlet'],
-                             stdin=subprocess.PIPE,
-                             stdout=subprocess.PIPE,
-                             stderr=subprocess.PIPE)
-        p.stdin.write(self.text)
-        p.stdin.close()
-        data = p.stdout.read()
-        p.stderr.read()
-        p.wait()
+        try:
+            p = subprocess.Popen(['figlet'],
+                                 stdin=subprocess.PIPE,
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+        except OSError, e:
+            if e.errno == 2:
+                print("ERROR: figlet is used but is not installed.")
+            else:
+                print("ERROR: unable to run figlet: %s" % e)
+            raw_input("Press ENTER to continue.")
+            data = "[Unable to run figlet]"
+        else:
+            p.stdin.write(self.text)
+            p.stdin.close()
+            data = p.stdout.read()
+            p.stderr.read()
+            p.wait()
         return data
 
 class CowsayText(urwid.WidgetWrap):
@@ -52,15 +61,24 @@ class CowsayText(urwid.WidgetWrap):
         super(CowsayText, self).__init__(widget)
 
     def _run(self):
-        p = subprocess.Popen(['cowsay'],
-                             stdin=subprocess.PIPE,
-                             stdout=subprocess.PIPE,
-                             stderr=subprocess.PIPE)
-        p.stdin.write(self.text)
-        p.stdin.close()
-        data = p.stdout.read()
-        p.stderr.read()
-        p.wait()
+        try:
+            p = subprocess.Popen(['cowsay'],
+                                 stdin=subprocess.PIPE,
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+        except OSError, e:
+            if e.errno == 2:
+                print("ERROR: cowsay is used but is not installed.")
+            else:
+                print("ERROR: unable to run cowsay: %s" % e)
+            raw_input("Press ENTER to continue.")
+            data = "[Unable to run cowsay]"
+        else:
+            p.stdin.write(self.text)
+            p.stdin.close()
+            data = p.stdout.read()
+            p.stderr.read()
+            p.wait()
         return data
 
 def main():
-- 
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