cvsimport: ease migration from CVSROOT/users format

This fixes a minor bug, which caused the author email to be
doubly enclosed in a <> pair (the code gave enclosing <> to
GIT_AUTHOR_EMAIL and GIT_COMMITTER_EMAIL environment variable).

The read_author_info() subroutine is taught to also understand
the user list in CVSROOT/users format.  This is primarily done
to ease migration for CVS users, who can use the -A option
to read from existing CVSROOT/users file.  write_author_info()
always writes in the git-cvsimport's native format ('='
delimited and value without quotes).

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index 8d493c2..fc207fc 100755 (executable)
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -48,16 +48,28 @@ sub read_author_info($) {
        open my $f, '<', "$file" or die("Failed to open $file: $!\n");
 
        while (<$f>) {
-               chomp;
-               # Expected format is this;
+               # Expected format is this:
                #   exon=Andreas Ericsson <ae@op5.se>
-               if (m/^([^ \t=]*)[ \t=]*([^<]*)(<.*$)\s*/) {
+               if (m/^(\S+?)\s*=\s*(.+?)\s*<(.+)>\s*$/) {
                        $user = $1;
-                       $conv_author_name{$1} = $2;
-                       $conv_author_email{$1} = $3;
-                       # strip trailing whitespace from author name
-                       $conv_author_name{$1} =~ s/\s*$//;
+                       $conv_author_name{$user} = $2;
+                       $conv_author_email{$user} = $3;
                }
+               # However, we also read from CVSROOT/users format
+               # to ease migration.
+               elsif (/^(\w+):(['"]?)(.+?)\2\s*$/) {
+                       my $mapped;
+                       ($user, $mapped) = ($1, $3);
+                       if ($mapped =~ /^\s*(.*?)\s*<(.*)>\s*$/) {
+                               $conv_author_name{$user} = $1;
+                               $conv_author_email{$user} = $2;
+                       }
+                       elsif ($mapped =~ /^<?(.*)>?$/) {
+                               $conv_author_name{$user} = $user;
+                               $conv_author_email{$user} = $1;
+                       }
+               }
+               # NEEDSWORK: Maybe warn on unrecognized lines?
        }
        close ($f);
 }
@@ -68,8 +80,7 @@ sub write_author_info($) {
          die("Failed to open $file for writing: $!");
 
        foreach (keys %conv_author_name) {
-               print $f "$_=" . $conv_author_name{$_} .
-                 " " . $conv_author_email{$_} . "\n";
+               print $f "$_=$conv_author_name{$_} <$conv_author_email{$_}>\n";
        }
        close ($f);
 }