[PATCHv2/RFC] gitweb: Prepare for splitting gitweb

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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@xxxxxxxxx>
---

This version uses shell 'for' loop, instead of make's $(foreach)
function, to avoid possible problem with generating a command line
that exceeded the maximum argument list length.  This solution has
also advantage of being more readable than original $(foreach ...)
version, with its overly long lines.

This idea is based on discussion surrounding Brandon Casey's patch.
In particular Bruce Stephens's suggestion was implemented to solve
issue of empty $(GITWEB_MODULES) variable (which is in this patch),
as implemented in
  [PATCH 2/2 v2] Makefile: work around ksh's failure to handle missing list argument to for loop
  http://thread.gmane.org/gmane.comp.version-control.git/147796/focus=150413

This version also moves installing modules to separate install-modules
target, as compared to previous version.

It also contains improvement from Pavan Kumar Sunkara, namely that
target is a directory, rather than destibation filename.  This might
be not necessary (and not much of an improvement).

 gitweb/Makefile    |   14 +++++++++++++-
 gitweb/gitweb.perl |    9 +++++++++
 2 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/gitweb/Makefile b/gitweb/Makefile
index 2fb7c2d..84a1d71 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))#'
@@ -145,12 +146,23 @@ gitweb.cgi: gitweb.perl GITWEB-BUILD-OPTIONS
 
 ### Installation rules
 
-install: all
+install: all install-modules
 	$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitwebdir_SQ)'
 	$(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)'
 
+install-modules:
+	install_dirs=$(sort $(dir $(GITWEB_MODULES))) && \
+	for dir in $$install_dirs; do \
+		test -d '$(DESTDIR_SQ)$(gitwebdir_SQ)/$$dir' || \
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(gitwebdir_SQ)/$$dir'; \
+	done
+	gitweb_modules=$(GITWEB_MODULES) && \
+	for mod in $$gitweb_modules; do \
+		$(INSTALL) -m 644 $$mod '$(DESTDIR_SQ)$(gitwebdir_SQ)/$$(dirname $$mod)'; \
+	done
+
 ### Cleaning rules
 
 clean:
diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 1f611d2..bf1485c 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;
-- 
1.7.0.1

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