teach --histogram to diff

diff --git a/Makefile b/Makefile
index f52d84b89f25c04685be163077af5f1a3abf06e4..f50d3c777027c1a2318f8ecc042d6ab97541b436 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,12 @@ all::
 # Define NO_OPENSSL environment variable if you do not have OpenSSL.
 # This also implies BLK_SHA1.
 #
+# Define USE_LIBPCRE if you have and want to use libpcre. git-grep will be
+# able to use Perl-compatible regular expressions.
+#
+# Define LIBPCREDIR=/foo/bar if your libpcre header and library files are in
+# /foo/bar/include and /foo/bar/lib directories.
+#
 # Define NO_CURL if you do not have libcurl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
 # transports.
@@ -545,6 +551,7 @@ LIB_H += rerere.h
 LIB_H += resolve-undo.h
 LIB_H += revision.h
 LIB_H += run-command.h
+LIB_H += sha1-array.h
 LIB_H += sha1-lookup.h
 LIB_H += sideband.h
 LIB_H += sigchain.h
@@ -647,6 +654,7 @@ LIB_OBJS += revision.o
 LIB_OBJS += run-command.o
 LIB_OBJS += server-info.o
 LIB_OBJS += setup.o
+LIB_OBJS += sha1-array.o
 LIB_OBJS += sha1-lookup.o
 LIB_OBJS += sha1_file.o
 LIB_OBJS += sha1_name.o
@@ -1256,6 +1264,15 @@ ifdef NO_LIBGEN_H
        COMPAT_OBJS += compat/basename.o
 endif
 
+ifdef USE_LIBPCRE
+       BASIC_CFLAGS += -DUSE_LIBPCRE
+       ifdef LIBPCREDIR
+               BASIC_CFLAGS += -I$(LIBPCREDIR)/include
+               EXTLIBS += -L$(LIBPCREDIR)/$(lib) $(CC_LD_DYNPATH)$(LIBPCREDIR)/$(lib)
+       endif
+       EXTLIBS += -lpcre
+endif
+
 ifdef NO_CURL
        BASIC_CFLAGS += -DNO_CURL
        REMOTE_CURL_PRIMARY =
@@ -1821,7 +1838,7 @@ ifndef NO_CURL
        GIT_OBJS += http.o http-walker.o remote-curl.o
 endif
 XDIFF_OBJS = xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \
-       xdiff/xmerge.o xdiff/xpatience.o
+       xdiff/xmerge.o xdiff/xpatience.o xdiff/xhistogram.o
 VCSSVN_OBJS = vcs-svn/string_pool.o vcs-svn/line_buffer.o \
        vcs-svn/repo_tree.o vcs-svn/fast_export.o vcs-svn/svndump.o
 VCSSVN_TEST_OBJS = test-obj-pool.o test-string-pool.o \
@@ -2087,6 +2104,7 @@ GIT-BUILD-OPTIONS: FORCE
        @echo PYTHON_PATH=\''$(subst ','\'',$(PYTHON_PATH_SQ))'\' >>$@
        @echo TAR=\''$(subst ','\'',$(subst ','\'',$(TAR)))'\' >>$@
        @echo NO_CURL=\''$(subst ','\'',$(subst ','\'',$(NO_CURL)))'\' >>$@
+       @echo USE_LIBPCRE=\''$(subst ','\'',$(subst ','\'',$(USE_LIBPCRE)))'\' >>$@
        @echo NO_PERL=\''$(subst ','\'',$(subst ','\'',$(NO_PERL)))'\' >>$@
        @echo NO_PYTHON=\''$(subst ','\'',$(subst ','\'',$(NO_PYTHON)))'\' >>$@
 ifdef GIT_TEST_CMP