From 893373eaacf15f24c6d98e75d44833730c923f95 Mon Sep 17 00:00:00 2001
From: Veeti Paananen <veeti.paananen@rojekti.fi>
Date: Thu, 2 May 2013 14:07:22 +0300
Subject: [PATCH] Build with the system's http-parser installation if available

---
 CMakeLists.txt                      | 15 +++++++++++---
 cmake/Modules/FindHTTP_Parser.cmake | 39 +++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 cmake/Modules/FindHTTP_Parser.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6bd25aa..10caa16 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,8 @@
 PROJECT(libgit2 C)
 CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
 
+SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
+
 # Build options
 #
 OPTION( SONAME				"Set the (SO)VERSION of the target"		ON  )
@@ -97,8 +99,16 @@ ELSE ()
 	IF (NOT AMIGA)
 		FIND_PACKAGE(OpenSSL)
 	ENDIF ()
-	FILE(GLOB SRC_HTTP deps/http-parser/*.c)
-	INCLUDE_DIRECTORIES(deps/http-parser)
+
+	FIND_PACKAGE(HTTP_Parser QUIET)
+	IF (HTTP_PARSER_FOUND AND HTTP_PARSER_VERSION_MAJOR EQUAL 2)
+		INCLUDE_DIRECTORIES(${HTTP_PARSER_INCLUDE_DIRS})
+		LINK_LIBRARIES(${HTTP_PARSER_LIBRARIES})
+	ELSE()
+		MESSAGE("http-parser was not found or is too old; using bundled 3rd-party sources.")
+		INCLUDE_DIRECTORIES(deps/http-parser)
+		FILE(GLOB SRC_HTTP deps/http-parser/*.c)
+	ENDIF()
 ENDIF()
 
 # Specify sha1 implementation
diff --git a/cmake/Modules/FindHTTP_Parser.cmake b/cmake/Modules/FindHTTP_Parser.cmake
new file mode 100644
index 0000000..d92bf75
--- /dev/null
+++ b/cmake/Modules/FindHTTP_Parser.cmake
@@ -0,0 +1,39 @@
+# - Try to find http-parser
+#
+# Defines the following variables:
+#
+# HTTP_PARSER_FOUND - system has http-parser
+# HTTP_PARSER_INCLUDE_DIR - the http-parser include directory
+# HTTP_PARSER_LIBRARIES - Link these to use http-parser
+# HTTP_PARSER_VERSION_MAJOR - major version
+# HTTP_PARSER_VERSION_MINOR - minor version
+# HTTP_PARSER_VERSION_STRING - the version of http-parser found
+
+# Find the header and library
+FIND_PATH(HTTP_PARSER_INCLUDE_DIR NAMES http_parser.h)
+FIND_LIBRARY(HTTP_PARSER_LIBRARY NAMES http_parser libhttp_parser)
+
+# Found the header, read version
+if (HTTP_PARSER_INCLUDE_DIR AND EXISTS "${HTTP_PARSER_INCLUDE_DIR}/http_parser.h")
+	FILE(READ "${HTTP_PARSER_INCLUDE_DIR}/http_parser.h" HTTP_PARSER_H)
+	IF (HTTP_PARSER_H)
+		STRING(REGEX REPLACE ".*#define[\t ]+HTTP_PARSER_VERSION_MAJOR[\t ]+([0-9]+).*" "\\1" HTTP_PARSER_VERSION_MAJOR "${HTTP_PARSER_H}")
+		STRING(REGEX REPLACE ".*#define[\t ]+HTTP_PARSER_VERSION_MINOR[\t ]+([0-9]+).*" "\\1" HTTP_PARSER_VERSION_MINOR "${HTTP_PARSER_H}")
+		SET(HTTP_PARSER_VERSION_STRING "${HTTP_PARSER_VERSION_MAJOR}.${HTTP_PARSER_VERSION_MINOR}")
+	ENDIF()
+	UNSET(HTTP_PARSER_H)
+ENDIF()
+
+# Handle the QUIETLY and REQUIRED arguments and set HTTP_PARSER_FOUND
+# to TRUE if all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(HTTP_Parser REQUIRED_VARS HTTP_PARSER_INCLUDE_DIR HTTP_PARSER_LIBRARY)
+
+# Hide advanced variables
+MARK_AS_ADVANCED(HTTP_PARSER_INCLUDE_DIR HTTP_PARSER_LIBRARY)
+
+# Set standard variables
+IF (HTTP_PARSER_FOUND)
+	SET(HTTP_PARSER_LIBRARIES ${HTTP_PARSER_LIBRARY})
+	set(HTTP_PARSER_INCLUDE_DIRS ${HTTP_PARSER_INCLUDE_DIR})
+ENDIF()
-- 
1.8.3