scripts/get_maintainer.pl: support multiple VCSs - add mercurial

Restructure a bit for multiple version control systems support.

Use a hash for each supported VCS that contains the commands
and patterns used to find commits, logs, and signers.

--git command line options are still used for hg except for
--git-since.  Use --hg-since instead.

The number of commits can differ for git and hg, so --rolestats
might be different.

Style changes: Use common push style push(@foo...), simplify a return

Bumped version to 0.23.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Marti Raudsepp <marti@juffo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 168 insertions, 93 deletions

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index fe91a984247b..445e8845f0a4 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -13,7 +13,7 @@
 use strict;
 
 my $P = $0;
-my $V = '0.22';
+my $V = '0.23';
 
 use Getopt::Long qw(:config no_auto_abbrev);
 
@@ -23,13 +23,14 @@ my $email_usename = 1;
 my $email_maintainer = 1;
 my $email_list = 1;
 my $email_subscriber_list = 0;
-my $email_git = 1;
 my $email_git_penguin_chiefs = 0;
+my $email_git = 1;
+my $email_git_blame = 0;
 my $email_git_min_signatures = 1;
 my $email_git_max_maintainers = 5;
 my $email_git_min_percent = 5;
 my $email_git_since = "1-year-ago";
-my $email_git_blame = 0;
+my $email_hg_since = "-365";
 my $email_remove_duplicates = 1;
 my $output_multiline = 1;
 my $output_separator = ", ";
@@ -66,15 +67,44 @@ my $penguin_chiefs = "\(" . join("|",@penguin_chief_names) . "\)";
 my $rfc822_lwsp = "(?:(?:\\r\\n)?[ \\t])";
 my $rfc822_char = '[\\000-\\377]';
 
+# VCS command support: class-like functions and strings
+
+my %VCS_cmds;
+
+my %VCS_cmds_git = (
+    "execute_cmd" => \&git_execute_cmd,
+    "available" => '(which("git") ne "") && (-d ".git")',
+    "find_signers_cmd" => "git log --since=\$email_git_since -- \$file",
+    "find_commit_signers_cmd" => "git log -1 \$commit",
+    "blame_range_cmd" => "git blame -l -L \$diff_start,+\$diff_length \$file",
+    "blame_file_cmd" => "git blame -l \$file",
+    "commit_pattern" => "^commit [0-9a-f]{40,40}",
+    "blame_commit_pattern" => "^([0-9a-f]+) "
+);
+
+my %VCS_cmds_hg = (
+    "execute_cmd" => \&hg_execute_cmd,
+    "available" => '(which("hg") ne "") && (-d ".hg")',
+    "find_signers_cmd" =>
+        "hg log --date=\$email_hg_since" .
+                " --template='commit {node}\\n{desc}\\n' -- \$file",
+    "find_commit_signers_cmd" => "hg log --template='{desc}\\n' -r \$commit",
+    "blame_range_cmd" => "",            # not supported
+    "blame_file_cmd" => "hg blame -c \$file",
+    "commit_pattern" => "^commit [0-9a-f]{40,40}",
+    "blame_commit_pattern" => "^([0-9a-f]+):"
+);
+
 if (!GetOptions(
                 'email!' => \$email,
                 'git!' => \$email_git,
+                'git-blame!' => \$email_git_blame,
                 'git-chief-penguins!' => \$email_git_penguin_chiefs,
                 'git-min-signatures=i' => \$email_git_min_signatures,
                 'git-max-maintainers=i' => \$email_git_max_maintainers,
                 'git-min-percent=i' => \$email_git_min_percent,
                 'git-since=s' => \$email_git_since,
-                'git-blame!' => \$email_git_blame,
+                'hg-since=s' => \$email_hg_since,
                 'remove-duplicates!' => \$email_remove_duplicates,
                 'm!' => \$email_maintainer,
                 'n!' => \$email_usename,
@@ -309,11 +339,11 @@ foreach my $file (@files) {
     }
 
     if ($email && $email_git) {
-        git_file_signoffs($file);
+        vcs_file_signoffs($file);
     }
 
     if ($email && $email_git_blame) {
-        git_assign_blame($file);
+        vcs_file_blame($file);
     }
 }
 
@@ -403,8 +433,9 @@ MAINTAINER field selection options:
     --git-min-signatures => number of signatures required (default: 1)
     --git-max-maintainers => maximum maintainers to add (default: 5)
     --git-min-percent => minimum percentage of commits required (default: 5)
-    --git-since => git history to use (default: 1-year-ago)
     --git-blame => use git blame to find modified commits for patch or file
+    --git-since => git history to use (default: 1-year-ago)
+    --hg-since => hg history to use (default: -365)
     --m => include maintainer(s) if any
     --n => include name 'Full Name <addr\@domain.tld>'
     --l => include list(s) if any
@@ -437,8 +468,8 @@ Notes:
           directory are examined as git recurses directories.
           Any specified X: (exclude) pattern matches are _not_ ignored.
       Used with "--nogit", directory is used as a pattern match,
-         no individual file within the directory or subdirectory
-         is matched.
+          no individual file within the directory or subdirectory
+          is matched.
       Used with "--git-blame", does not iterate all files in directory
   Using "--git-blame" is slow and may add old committers and authors
       that are no longer active maintainers to the output.
@@ -449,6 +480,12 @@ Notes:
       not the percentage of the entire file authored.  # of commits is
       not a good measure of amount of code authored.  1 major commit may
       contain a thousand lines, 5 trivial commits may modify a single line.
+  If git is not installed, but mercurial (hg) is installed and an .hg
+      repository exists, the following options apply to mercurial:
+          --git,
+          --git-min-signatures, --git-max-maintainers, --git-min-percent, and
+          --git-blame
+      Use --hg-since not --git-since to control date selection
 EOT
 }
 
@@ -807,44 +844,37 @@ sub mailmap {
     return @lines;
 }
 
-my $printed_nogit = 0;
-my $printed_nogitdir = 0;
-sub has_git {
-    if (which("git") eq "") {
-        if (!$printed_nogit) {
-            warn("$P: git not found.  Add --nogit to options?\n");
-            $printed_nogit = 1;
-        }
-        return 0;
-    }
-    if (!(-d ".git")) {
-        if (!$printed_nogitdir) {
-            warn(".git directory not found.  "
-                 . "Using a git repository produces better results.\n");
-            warn("Try Linus Torvalds' latest git repository using:\n");
-            warn("git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git\n");
-            $printed_nogitdir = 1;
-        }
-        return 0;
-    }
+sub git_execute_cmd {
+    my ($cmd) = @_;
+    my @lines = ();
 
-    return 1;
+    my $output = `$cmd`;
+    $output =~ s/^\s*//gm;
+    @lines = split("\n", $output);
+
+    return @lines;
 }
 
-sub git_find_signers {
+sub hg_execute_cmd {
     my ($cmd) = @_;
+    my @lines = ();
+