Search for colors.txt in multiple locations, fixes #27

Locations (in order):
* <world path>/colors.txt
* $HOME/.minetest/colors.txt (Linux only)
* <share dir>/colors.txt (Linux only for now, defaults to /usr/local/share/minetest)
* current directory (<< this is the old behavior)

CMakeLists.txt

@@ -7,6 +7,7 @@ set(VERSION_MAJOR 1)
 set(VERSION_MINOR 0)
 set(VERSION_STRING "${VERSION_MAJOR}.${VERSION_MINOR}")
 
+# Stuff & Paths
 
 if(NOT CMAKE_BUILD_TYPE)
 	set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build.")
@@ -23,7 +24,37 @@ endif(USE_CXX11)
 set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall")
 set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g2 -Wall")
 
-# Find libgd
+if(WIN32)
+	set(SHAREDIR ".")
+	set(BINDIR ".")
+	set(DOCDIR ".")
+else()
+	set(SHAREDIR "${CMAKE_INSTALL_PREFIX}/share/minetest") # an extra dir. for just one file doesn't seem useful
+	set(BINDIR "${CMAKE_INSTALL_PREFIX}/bin")
+	set(DOCDIR "${CMAKE_INSTALL_PREFIX}/share/doc/${PROJECT_NAME}")
+endif()
+
+set(CUSTOM_SHAREDIR "" CACHE STRING "Directory to install data files into")
+if(NOT CUSTOM_SHAREDIR STREQUAL "")
+        set(SHAREDIR "${CUSTOM_SHAREDIR}")
+        message(STATUS "Using SHAREDIR=${SHAREDIR}")
+endif()
+
+set(CUSTOM_BINDIR "" CACHE STRING "Directory to install binaries into")
+if(NOT CUSTOM_BINDIR STREQUAL "")
+        set(BINDIR "${CUSTOM_BINDIR}")
+        message(STATUS "Using BINDIR=${BINDIR}")
+endif()
+
+set(CUSTOM_DOCDIR "" CACHE STRING "Directory to install documentation into")
+if(NOT CUSTOM_DOCDIR STREQUAL "")
+        set(DOCDIR "${CUSTOM_DOCDIR}")
+        message(STATUS "Using DOCDIR=${DOCDIR}")
+endif()
+
+
+# Libraries: gd
+
 find_library(LIBGD_LIBRARY gd)
 find_path(LIBGD_INCLUDE_DIR gd.h)
 message (STATUS "libgd library: ${LIBGD_LIBRARY}")
@@ -32,7 +63,8 @@ if(NOT LIBGD_LIBRARY OR NOT LIBGD_INCLUDE_DIR)
 	message(FATAL_ERROR "libgd not found!")
 endif(NOT LIBGD_LIBRARY OR NOT LIBGD_INCLUDE_DIR)
 
-# Find zlib
+# Libraries: zlib
+
 find_library(ZLIB_LIBRARY z)
 find_path(ZLIB_INCLUDE_DIR zlib.h)
 message (STATUS "zlib library: ${ZLIB_LIBRARY}")
@@ -44,7 +76,8 @@ endif(NOT ZLIB_LIBRARY OR NOT ZLIB_INCLUDE_DIR)
 find_package(PkgConfig)
 include(FindPackageHandleStandardArgs)
 
-# Find libsqlite3
+# Libraries: sqlite3
+
 find_library(SQLITE3_LIBRARY sqlite3)
 find_path(SQLITE3_INCLUDE_DIR zlib.h)
 message (STATUS "sqlite3 library: ${SQLITE3_LIBRARY}")
@@ -53,7 +86,8 @@ if(NOT SQLITE3_LIBRARY OR NOT SQLITE3_INCLUDE_DIR)
 	message(FATAL_ERROR "sqlite3 not found!")
 endif(NOT SQLITE3_LIBRARY OR NOT SQLITE3_INCLUDE_DIR)
 
-# Find leveldb
+# Libraries: leveldb
+
 set(USE_LEVELDB 0)
 
 OPTION(ENABLE_LEVELDB "Enable LevelDB backend")
@@ -73,7 +107,8 @@ if(ENABLE_LEVELDB)
 	endif(LEVELDB_LIBRARY AND LEVELDB_INCLUDE_DIR)
 endif(ENABLE_LEVELDB)
 
-# Find redis
+# Libraries: redis
+
 set(USE_REDIS 0)
 
 OPTION(ENABLE_REDIS "Enable redis backend")
@@ -93,6 +128,8 @@ if(ENABLE_REDIS)
 	endif(REDIS_LIBRARY AND REDIS_INCLUDE_DIR)
 endif(ENABLE_REDIS)
 
+# Compiling & Linking
+
 include_directories(
 	"${PROJECT_BINARY_DIR}"
 	"${CMAKE_CURRENT_SOURCE_DIR}"
@@ -139,12 +176,13 @@ target_link_libraries(
 	${ZLIB_LIBRARY}
 )
 
-install(FILES "AUTHORS" DESTINATION ".")
-install(FILES "COPYING" DESTINATION ".")
-install(FILES "README.rst" DESTINATION ".")
-install(FILES "colors.txt" DESTINATION ".")
+# Installing & Packaging
 
-# CPack
+install(TARGETS "${PROJECT_NAME}" DESTINATION "${BINDIR}")
+install(FILES "AUTHORS" DESTINATION "${DOCDIR}")
+install(FILES "COPYING" DESTINATION "${DOCDIR}")
+install(FILES "README.rst" DESTINATION "${DOCDIR}")
+install(FILES "colors.txt" DESTINATION "${SHAREDIR}")
 
 set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Overview mapper for Minetest")
 set(CPACK_PACKAGE_VERSION_MAJOR ${VERSION_MAJOR})
@@ -153,11 +191,9 @@ set(CPACK_PACKAGE_VENDOR "celeron55")
 set(CPACK_PACKAGE_CONTACT "Perttu Ahola <celeron55@gmail.com>")
 
 if(WIN32)
-	install(FILES "${PROJECT_BINARY_DIR}/minetestmapper.exe" DESTINATION ".")
 	set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}-${VERSION_STRING}-win32")
 	set(CPACK_GENERATOR ZIP)
 else()
-	install(FILES "${PROJECT_BINARY_DIR}/minetestmapper" DESTINATION ".")
 	set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}-${VERSION_STRING}-linux")
 	set(CPACK_GENERATOR TGZ)
 	set(CPACK_SOURCE_GENERATOR TGZ)

cmake_config.h.in

@@ -8,5 +8,7 @@
 
 #define USE_CXX11 @USE_CXX11@
 
+#define SHAREDIR "@SHAREDIR@"
+
 #endif
 

mapper.cpp

@@ -1,10 +1,12 @@
 #include <cstdlib>
 #include <getopt.h>
+#include <fstream>
 #include <iostream>
 #include <map>
 #include <string>
 #include <sstream>
 #include <stdexcept>
+#include "cmake_config.h"
 #include "TileGenerator.h"
 
 void usage()
@@ -31,9 +33,30 @@ void usage()
 	std::cout << usage_text;
 }
 
-std::string search_colors()
+bool file_exists(const std::string &path)
 {
-	// TBD
+	std::ifstream ifs(path.c_str());
+	return ifs.is_open();
+}
+
+std::string search_colors(const std::string &worldpath)
+{
+	if(file_exists(worldpath + "/colors.txt"))
+		return worldpath + "/colors.txt";
+
+#ifndef _WIN32
+	char *home = std::getenv("HOME");
+	if(home) {
+		std::string check = ((std::string) home) + "/.minetest/colors.txt";
+		if(file_exists(check))
+			return check;
+	}
+#endif
+
+	if(!(SHAREDIR[0] == '.' || SHAREDIR[0] == '\0') && file_exists(SHAREDIR "/colors.txt"))
+		return SHAREDIR "/colors.txt";
+
+	std::cerr << "Warning: Falling back to using colors.txt from current directory." << std::endl;
 	return "colors.txt";
 }
 
@@ -163,7 +186,8 @@ int main(int argc, char *argv[])
 		}
 	}
 	if(colors == "")
-		colors = search_colors();
+		colors = search_colors(input);
+	std::cerr << "is at " << colors << std::endl;
 	try {
 		generator.parseColorsFile(colors);
 		generator.generate(input, output);