core.Publisher.publish(): Prompt when waiting for input from a terminal.

When front-end tools are used without arguments,
Docutils reads from stdin.

Currently, when a user calls a front-end without arguments,
there is no response until the user presses Ctrl-D (Ctrl-Z on Windows)
or aborts with Ctrl-C.

This commit changes the behaviour to tell the user what the front-end
expects and where to get more help.

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk/docutils@9043 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

1 files changed, 12 insertions, 0 deletions

diff --git a/docutils/io.py b/docutils/io.py
index ca0adfbb5..daa7a0b3f 100644
--- a/docutils/io.py
+++ b/docutils/io.py
@@ -175,6 +175,12 @@ class Input(TransformSpec):
                 return match.group(1).decode('ascii')
         return None
 
+    def isatty(self):
+        try:
+            return self.source.isatty()
+        except AttributeError:
+            return False
+
 
 class Output(TransformSpec):
 
@@ -304,6 +310,12 @@ class ErrorOutput:
         except AttributeError:
             pass
 
+    def isatty(self):
+        try:
+            return self.destination.isatty()
+        except AttributeError:
+            return False
+
 
 class FileInput(Input):