[PATCH] send-email: Add config option for sender address

[Trent Piepho <xyzzy@speakeasy.org>]

The sender address, as specified with the '--from' command line option,
couldn't be set in the config file.  So add a new config option,
'sendemail.from', which sets it.  One can use 'sendemail.<identity>.from'
as well of course, which is likely the more useful case.

The sender address would default to GIT_AUTHOR_IDENT, which is usually the
right thing, but this doesn't allow switching based on the identity
selected.  It's possible to switch the SMTP server and envelope sender by
using the '--identity' option, in which case one probably wants to use a
different from address as well, but this had to be manually specified.

The docs are also fixed up somewhat.  If '--from' is specified (or the new
sendemail.from option is used) then the user isn't prompted.  The default
with no '--from' option (or sendemail.from option) is GIT_AUTHOR_IDENT
first then GIT_COMMITTER_IDENT, not just GIT_COMMITTER_IDENT.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
---
 Documentation/git-send-email.txt |    9 ++++++---
 git-send-email.perl              |    1 +
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index ff4aeff..8345df2 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -57,9 +57,12 @@ If it wasn't able to see a header in the summary it will ask you about it
 interactively after quitting your editor.
 
 --from::
-	Specify the sender of the emails.  This will default to
-	the value GIT_COMMITTER_IDENT, as returned by "git var -l".
-	The user will still be prompted to confirm this entry.
+	Specify the sender of the emails.  If not specified on the command line,
+	the value of the 'sendemail.from' configuration option is used.  If
+	neither the command line option nor 'sendemail.from' are set, then the
+	user will be prompted for the value.  The default for the prompt will be
+	the value of GIT_AUTHOR_IDENT, or GIT_COMMITTER_IDENT if that is not
+	set, as returned by "git var -l".
 
 --in-reply-to::
 	Specify the contents of the first In-Reply-To header.
diff --git a/git-send-email.perl b/git-send-email.perl
index 77ca8fe..ec58f12 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -207,6 +207,7 @@ my %config_settings = (
     "suppresscc" => \@suppress_cc,
     "envelopesender" => \$envelope_sender,
     "multiedit" => \$multiedit,
+    "from" => \$sender,
 );
 
 # Handle Uncouth Termination
-- 
1.5.4.1