Read backend from world.mt, closes #6

CMakeLists.txt

@@ -101,6 +101,7 @@ set(mapper_SRCS
 	TileGenerator.cpp
 	ZlibDecompressor.cpp
 	mapper.cpp
+	util.cpp
 	db-sqlite3.cpp
 )
 

TileGenerator.cpp

@@ -13,6 +13,7 @@
 #include "PlayerAttributes.h"
 #include "TileGenerator.h"
 #include "ZlibDecompressor.h"
+#include "util.h"
 #include "db-sqlite3.h"
 #if USE_LEVELDB
 #include "db-leveldb.h"
@@ -96,7 +97,6 @@ TileGenerator::TileGenerator():
 	m_drawAlpha(false),
 	m_shading(true),
 	m_border(0),
-	m_backend("sqlite3"),
 	m_image(0),
 	m_xMin(INT_MAX),
 	m_xMax(INT_MIN),
@@ -233,11 +233,6 @@ void TileGenerator::parseColorsFile(const std::string &fileName)
 	parseColorsStream(in);
 }
 
-void TileGenerator::setBackend(std::string backend)
-{
-	m_backend = backend;
-}
-
 void TileGenerator::generate(const std::string &input, const std::string &output)
 {
 	string input_path = input;
@@ -289,18 +284,24 @@ void TileGenerator::parseColorsStream(std::istream &in)
 
 void TileGenerator::openDb(const std::string &input)
 {
-	if(m_backend == "sqlite3")
+	std::ifstream ifs((input + "/world.mt").c_str());
+	if(!ifs.good())
+		throw std::runtime_error("Failed to read world.mt");
+	std::string backend = get_setting("backend", ifs);
+	ifs.close();
+
+	if(backend == "sqlite3")
 		m_db = new DBSQLite3(input);
 #if USE_LEVELDB
-	else if(m_backend == "leveldb")
+	else if(backend == "leveldb")
 		m_db = new DBLevelDB(input);
 #endif
 #if USE_REDIS
-	else if(m_backend == "redis")
+	else if(backend == "redis")
 		m_db = new DBRedis(input);
 #endif
 	else
-		throw std::runtime_error(((std::string) "Unknown map backend: ") + m_backend);
+		throw std::runtime_error(((std::string) "Unknown map backend: ") + backend);
 }
 
 void TileGenerator::loadBlocks()

TileGenerator.h

@@ -86,7 +86,6 @@ private:
 	bool m_drawAlpha;
 	bool m_shading;
 	int m_border;
-	std::string m_backend;
 
 	DB *m_db;
 	gdImagePtr m_image;
@@ -114,4 +113,3 @@ private:
 }; // class TileGenerator
 
 #endif // TILEGENERATOR_HEADER
-

db-redis.cpp

@@ -3,6 +3,7 @@
 #include <fstream>
 #include "db-redis.h"
 #include "types.h"
+#include "util.h"
 
 static inline int64_t stoi64(const std::string &s)
 {
@@ -20,61 +21,6 @@ static inline std::string i64tos(int64_t i)
 	return os.str();
 }
 
-inline std::string trim(const std::string &s)
-{
-	size_t front = 0;
-	while(s[front] == ' '    ||
-	      s[front] == '\t'   ||
-	      s[front] == '\r'   ||
-	      s[front] == '\n'
-	     )
-		++front;
-
-	size_t back = s.size();
-	while(back > front &&
-	      (s[back-1] == ' '  ||
-	       s[back-1] == '\t' ||
-	       s[back-1] == '\r' ||
-	       s[back-1] == '\n'
-	      )
-	     )
-		--back;
-
-	return s.substr(front, back - front);
-}
-
-#define EOFCHECK() \
- 	if(is.eof()) \
-		throw std::runtime_error("setting not found");
-
-std::string get_setting(std::string name, std::istream &is)
-{
-	char c;
-	char s[256];
-	std::string nm, value;
-
-	next:
-	while((c = is.get()) == ' ' || c == '\t' || c == '\r' || c == '\n')
-		;
-	EOFCHECK();
-	if(c == '#') // Ignore comments
-		is.ignore(0xffff, '\n');
-	EOFCHECK();
-	s[0] = c; // The current char belongs to the name too
-	is.get(&s[1], 255, '=');
-	is.ignore(1); // Jump over the =
-	EOFCHECK();
-	nm = trim(std::string(s));
-	is.get(s, 256, '\n');
-	value = trim(std::string(s));
-	if(name == nm)
-		return value;
-	else
-		goto next;
-}
-
-#undef EOFCHECK
-
 std::string get_setting_default(std::string name, std::istream &is, const std::string def)
 {
 	try {

mapper.cpp

@@ -34,7 +34,6 @@ void usage()
 			"  --noshading\n"
 			"  --min-y <y>\n"
 			"  --max-y <y>\n"
-			"  --backend <sqlite3/leveldb/redis>\n"
 			"  --geometry x:y+w+h\n"
 			"Color format: '#000000'\n";
 	std::cout << usage_text;
@@ -58,8 +57,7 @@ int main(int argc, char *argv[])
 		{"noshading", no_argument, 0, 'H'},
 		{"geometry", required_argument, 0, 'g'},
 		{"min-y", required_argument, 0, 'a'},
-		{"max-y", required_argument, 0, 'c'},
+		{"max-y", required_argument, 0, 'c'}
-		{"backend", required_argument, 0, 'd'},
 	};
 
 	string input;
@@ -145,9 +143,6 @@ int main(int argc, char *argv[])
 					generator.setGeometry(x, y, w, h);
 				}
 				break;
-			case 'd':
-				generator.setBackend(optarg);
-				break;
 			default:
 				exit(1);
 		}

util.cpp

@@ -0,0 +1,56 @@
+#include "util.h"
+
+inline std::string trim(const std::string &s)
+{
+  size_t front = 0;
+  while(s[front] == ' '    ||
+        s[front] == '\t'   ||
+        s[front] == '\r'   ||
+        s[front] == '\n'
+       )
+    ++front;
+
+  size_t back = s.size();
+  while(back > front &&
+        (s[back-1] == ' '  ||
+         s[back-1] == '\t' ||
+         s[back-1] == '\r' ||
+         s[back-1] == '\n'
+        )
+       )
+    --back;
+
+  return s.substr(front, back - front);
+}
+
+#define EOFCHECK() \
+   if(is.eof()) \
+    throw std::runtime_error("setting not found");
+
+std::string get_setting(std::string name, std::istream &is)
+{
+  char c;
+  char s[256];
+  std::string nm, value;
+
+  next:
+  while((c = is.get()) == ' ' || c == '\t' || c == '\r' || c == '\n')
+    ;
+  EOFCHECK();
+  if(c == '#') // Ignore comments
+    is.ignore(0xffff, '\n');
+  EOFCHECK();
+  s[0] = c; // The current char belongs to the name too
+  is.get(&s[1], 255, '=');
+  is.ignore(1); // Jump over the =
+  EOFCHECK();
+  nm = trim(std::string(s));
+  is.get(s, 256, '\n');
+  value = trim(std::string(s));
+  if(name == nm)
+    return value;
+  else
+    goto next;
+}
+
+#undef EOFCHECK

util.h

@@ -0,0 +1,10 @@
+#ifndef _UTIL_H
+#define _UTIL_H
+
+#include <string>
+#include <stdexcept>
+#include <fstream>
+
+std::string get_setting(std::string name, std::istream &is);
+
+#endif // _UTIL_H