[PATCH v2 1/4] git-p4: yes/no prompts should sanitize user text

["Ben Keene via GitGitGadget" <gitgitgadget@gmail.com>]

From: Ben Keene <seraphire@gmail.com>

When prompting the user interactively for direction, the tests are
not forgiving of user input format.

For example, the first query asks for a yes/no response. If the user
enters the full word "yes" or "no" or enters a capital "Y" the test
will fail.

Create a new function, prompt(prompt_text, choices) where
  * promt_text is the text prompt for the user
  * is a list of lower-case, single letter choices.
This new function must  prompt the user for input and sanitize it by
converting the response to a lower case string, trimming leading and
trailing spaces, and checking if the first character is in the list
of choices. If it is, return the first letter.

Change the current references to raw_input() to use this new function.

Signed-off-by: Ben Keene <seraphire@gmail.com>
---
 git-p4.py | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/git-p4.py b/git-p4.py
index 60c73b6a37..0fa562fac9 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -167,6 +167,17 @@ def die(msg):
         sys.stderr.write(msg + "\n")
         sys.exit(1)
 
+def prompt(prompt_text, choices = []):
+    """ Prompt the user to choose one of the choices
+    """
+    while True:
+        response = raw_input(prompt_text).strip().lower()
+        if len(response) == 0:
+            continue
+        response = response[0]
+        if response in choices:
+            return response
+
 def write_pipe(c, stdin):
     if verbose:
         sys.stderr.write('Writing pipe: %s\n' % str(c))
@@ -1779,7 +1790,7 @@ def edit_template(self, template_file):
             return True
 
         while True:
-            response = raw_input("Submit template unchanged. Submit anyway? [y]es, [n]o (skip this patch) ")
+            response = prompt("Submit template unchanged. Submit anyway? [y]es, [n]o (skip this patch) ", ["y", "n"])
             if response == 'y':
                 return True
             if response == 'n':
@@ -2350,8 +2361,8 @@ def run(self, args):
                         # prompt for what to do, or use the option/variable
                         if self.conflict_behavior == "ask":
                             print("What do you want to do?")
-                            response = raw_input("[s]kip this commit but apply"
-                                                 " the rest, or [q]uit? ")
+                            response = prompt("[s]kip this commit but apply"
+                                                 " the rest, or [q]uit? ", ["s", "q"])
                             if not response:
                                 continue
                         elif self.conflict_behavior == "skip":
-- 
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