[RFC/PATCHv2] gitweb: Prepare for splitting gitweb

[Jakub Narebski <jnareb@gmail.com>]

Prepare gitweb for having been split into modules that are to be
installed alongside gitweb in 'lib/' subdirectory, by adding

  use lib __DIR__.'/lib';

to gitweb.perl (to main gitweb script), and preparing for putting
modules (relative path) in $(GITWEB_MODULES) in gitweb/Makefile.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
This one actually works: tested with gitweb caching series, with
gitweb caching support split into modules.

The generated command is not very elegant, but perhaps it doesn't
matter:

  install -d -m 755 '/home/local/gitweb'
  install -m 755 gitweb.cgi '/home/local/gitweb'
  install -d -m 755 '/home/local/gitweb/static'
  install -m 644 static/gitweb.js static/gitweb.css static/git-logo.png static/git-favicon.png '/home/local/gitweb/static'
  test -d '/home/local/gitweb/lib/GitwebCache/' || install -d -m 755 '/home/local/gitweb/lib/GitwebCache/'; test -d '/home/local/gitweb/lib/GitwebCache/Capture/' || install -d -m 755 '/home/local/gitweb/lib/GitwebCache/Capture/';
  install -m 644 lib/GitwebCache/CacheOutput.pm '/home/local/gitweb/lib/GitwebCache/CacheOutput.pm'; install -m 644 lib/GitwebCache/SimpleFileCache.pm '/home/local/gitweb/lib/GitwebCache/SimpleFileCache.pm'; install -m 644 lib/GitwebCache/Capture.pm '/home/local/gitweb/lib/GitwebCache/Capture.pm'; install -m 644 lib/GitwebCache/Capture/SelectFH.pm '/home/local/gitweb/lib/GitwebCache/Capture/SelectFH.pm';

This patch is based on commit c0cb4ed (git-instaweb: Configure it to
work with new gitweb structure, 2010-05-28), which is top commit of
'ps/gitweb-soc' branch merged into next on 2010-06-03 (as commit
5db4adf).

 gitweb/Makefile    |    3 +++
 gitweb/gitweb.perl |    9 +++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/gitweb/Makefile b/gitweb/Makefile
index d2584fe..d2401e1 100644
--- a/gitweb/Makefile
+++ b/gitweb/Makefile
@@ -55,6 +55,7 @@ PERL_PATH  ?= /usr/bin/perl
 bindir_SQ = $(subst ','\'',$(bindir))#'
 gitwebdir_SQ = $(subst ','\'',$(gitwebdir))#'
 gitwebstaticdir_SQ = $(subst ','\'',$(gitwebdir)/static)#'
+gitweblibdir_SQ = $(subst ','\'',$(gitwebdir)/lib)#'
 SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))#'
 PERL_PATH_SQ  = $(subst ','\'',$(PERL_PATH))#'
 DESTDIR_SQ    = $(subst ','\'',$(DESTDIR))#'
@@ -150,6 +151,8 @@ install: all
 	$(INSTALL) -m 755 $(GITWEB_PROGRAMS) '$(DESTDIR_SQ)$(gitwebdir_SQ)'
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitwebstaticdir_SQ)'
 	$(INSTALL) -m 644 $(GITWEB_FILES) '$(DESTDIR_SQ)$(gitwebstaticdir_SQ)'
+	$(foreach dir,$(sort $(dir $(GITWEB_MODULES))),test -d '$(DESTDIR_SQ)$(gitwebdir_SQ)/$(dir)' || $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitwebdir_SQ)/$(dir)';)
+	$(foreach mod,$(GITWEB_MODULES),$(INSTALL) -m 644 $(mod) '$(DESTDIR_SQ)$(gitwebdir_SQ)/$(mod)';)
 
 ### Cleaning rules
 
diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index e108bbc..dd65943 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -9,6 +9,14 @@
 
 use strict;
 use warnings;
+
+use File::Spec;
+# __DIR__ is taken from Dir::Self __DIR__ fragment
+sub __DIR__ () {
+	File::Spec->rel2abs(join '', (File::Spec->splitpath(__FILE__))[0, 1]);
+}
+use lib __DIR__ . '/lib';
+
 use CGI qw(:standard :escapeHTML -nosticky);
 use CGI::Util qw(unescape);
 use CGI::Carp qw(fatalsToBrowser set_message);
@@ -16,6 +24,7 @@ use Encode;
 use Fcntl ':mode';
 use File::Find qw();
 use File::Basename qw(basename);
+
 binmode STDOUT, ':utf8';
 
 our $t0;