diff --git a/Makefile b/Makefile
index 631e551..823bf2b 100644
--- a/Makefile
+++ b/Makefile
@@ -40,6 +40,7 @@ dist:
 		$(PACKAGE)-$(VERSION)/include/System/plugin.h \
 		$(PACKAGE)-$(VERSION)/include/System/string.h \
 		$(PACKAGE)-$(VERSION)/include/System/token.h \
+		$(PACKAGE)-$(VERSION)/include/System/variable.h \
 		$(PACKAGE)-$(VERSION)/include/System/Makefile \
 		$(PACKAGE)-$(VERSION)/include/System/project.conf \
 		$(PACKAGE)-$(VERSION)/src/array.c \
@@ -53,6 +54,7 @@ dist:
 		$(PACKAGE)-$(VERSION)/src/plugin.c \
 		$(PACKAGE)-$(VERSION)/src/string.c \
 		$(PACKAGE)-$(VERSION)/src/token.c \
+		$(PACKAGE)-$(VERSION)/src/variable.c \
 		$(PACKAGE)-$(VERSION)/src/Makefile \
 		$(PACKAGE)-$(VERSION)/src/token.h \
 		$(PACKAGE)-$(VERSION)/src/project.conf \
diff --git a/include/System.h b/include/System.h
index 71d937d..aa89775 100644
--- a/include/System.h
+++ b/include/System.h
@@ -28,5 +28,6 @@
 # include "System/parser.h"
 # include "System/plugin.h"
 # include "System/string.h"
+# include "System/variable.h"
 
 #endif /* !LIBSYSTEM_SYSTEM_H */
diff --git a/include/System/Makefile b/include/System/Makefile
index 433d352..172e441 100644
--- a/include/System/Makefile
+++ b/include/System/Makefile
@@ -38,6 +38,8 @@ install:
 	$(INSTALL) -m 0644 -- string.h $(DESTDIR)$(INCLUDEDIR)/System/string.h
 	$(MKDIR) $(DESTDIR)$(INCLUDEDIR)/System
 	$(INSTALL) -m 0644 -- token.h $(DESTDIR)$(INCLUDEDIR)/System/token.h
+	$(MKDIR) $(DESTDIR)$(INCLUDEDIR)/System
+	$(INSTALL) -m 0644 -- variable.h $(DESTDIR)$(INCLUDEDIR)/System/variable.h
 
 uninstall:
 	$(RM) -- $(DESTDIR)$(INCLUDEDIR)/System/array.h
@@ -52,5 +54,6 @@ uninstall:
 	$(RM) -- $(DESTDIR)$(INCLUDEDIR)/System/plugin.h
 	$(RM) -- $(DESTDIR)$(INCLUDEDIR)/System/string.h
 	$(RM) -- $(DESTDIR)$(INCLUDEDIR)/System/token.h
+	$(RM) -- $(DESTDIR)$(INCLUDEDIR)/System/variable.h
 
 .PHONY: all clean distclean install uninstall
diff --git a/include/System/parser.h b/include/System/parser.h
index 9d4fdaf..5111dd0 100644
--- a/include/System/parser.h
+++ b/include/System/parser.h
@@ -46,6 +46,8 @@ int parser_remove_callback(Parser * parser, ParserCallback callback);
 int parser_add_filter(Parser * parser, ParserFilter filter, void * data);
 int parser_remove_filter(Parser * parser, ParserFilter filter);
 
+int parser_inject(Parser * parser, char const * string);
+
 int parser_scan(Parser * parser);
 int parser_scan_filter(Parser * parser);
 
diff --git a/include/System/project.conf b/include/System/project.conf
index 6c2b489..9005855 100644
--- a/include/System/project.conf
+++ b/include/System/project.conf
@@ -1,4 +1,4 @@
-includes=array.h,buffer.h,config.h,error.h,event.h,file.h,hash.h,object.h,parser.h,plugin.h,string.h,token.h
+includes=array.h,buffer.h,config.h,error.h,event.h,file.h,hash.h,object.h,parser.h,plugin.h,string.h,token.h,variable.h
 dist=Makefile
 
 [array.h]
@@ -36,3 +36,6 @@ install=$(INCLUDEDIR)/System
 
 [token.h]
 install=$(INCLUDEDIR)/System
+
+[variable.h]
+install=$(INCLUDEDIR)/System
diff --git a/include/System/string.h b/include/System/string.h
index 504d667..5e1f149 100644
--- a/include/System/string.h
+++ b/include/System/string.h
@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2009 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS System libSystem */
 /* This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -49,4 +49,6 @@ String ** string_explode(String const * string, String const * separator);
 String * string_find(String const * string, String const * key);
 ssize_t string_index(String const * string, String const * key);
 
+int string_replace(String ** string, String const * what, String const * by);
+
 #endif /* !LIBSYSTEM_STRING_H */
diff --git a/src/Makefile b/src/Makefile
index 15acebf..c5a46aa 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -18,7 +18,7 @@ INSTALL	= install
 
 all: $(TARGETS)
 
-libSystem_OBJS = array.o buffer.o config.o error.o event.o hash.o object.o parser.o plugin.o string.o token.o
+libSystem_OBJS = array.o buffer.o config.o error.o event.o hash.o object.o parser.o plugin.o string.o token.o variable.o
 libSystem_CFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CFLAGSF) $(CFLAGS)
 libSystem_LDFLAGS = $(LDFLAGSF) $(LDFLAGS) 
 
@@ -62,6 +62,9 @@ string.o: string.c
 token.o: token.c token.h
 	$(CC) $(libSystem_CFLAGS) -c token.c
 
+variable.o: variable.c
+	$(CC) $(libSystem_CFLAGS) -c variable.c
+
 clean:
 	$(RM) -- $(libSystem_OBJS)
 
diff --git a/src/config.c b/src/config.c
index 5b2a930..d564d22 100644
--- a/src/config.c
+++ b/src/config.c
@@ -213,6 +213,7 @@ int config_load(Config * config, char const * filename)
 		string_delete(section);
 		return error_set_code(1, "%s: %s", filename, strerror(errno));
 	}
+	/* FIXME unescape backslashes (eg allow multiple lines) */
 	for(line = 0; (c = fgetc(fp)) != EOF; line++)
 		if(c == '#')
 			while((c = fgetc(fp)) != EOF && c != '\n');
@@ -425,6 +426,7 @@ void _save_foreach_section(void const * key, void * value, void * data)
 
 	if(*fp == NULL)
 		return;
+	/* FIXME escape lines with a backslash */
 	if(val == NULL || fprintf(*fp, "%s=%s\n", var, val) >= 0)
 		return;
 	fclose(*fp);
diff --git a/src/parser.c b/src/parser.c
index 7cc5751..f5e1cdb 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -35,6 +35,7 @@ typedef struct _ParserCallbackData ParserCallbackData;
 struct _Parser
 {
 	/* parsing sources */
+	char * inject;
 	char * filename;
 	FILE * fp;
 	char * string;
@@ -45,7 +46,6 @@ struct _Parser
 	unsigned int line;
 	unsigned int col;
 	int last;
-	unsigned int lookahead;
 
 	ParserFilter scanner;
 
@@ -80,21 +80,28 @@ int parser_scan_filter(Parser * parser)
 	int c = parser->last;
 	size_t i;
 	ParserFilterData * pfd;
-	int l;
 
 #ifdef DEBUG
 	fprintf(stderr, "DEBUG: %s(%p)\n", __func__, parser);
 #endif
-	if(parser->lookahead)
-		parser->lookahead--;
+	if(parser->inject)
+	{
+		c = parser->inject[0];
+		if((i = strlen(parser->inject)) > 1)
+			memmove(parser->inject, &parser->inject[1], i);
+		else
+		{
+			string_delete(parser->inject);
+			parser->inject = NULL;
+		}
+	}
 	else if(parser->scanner(&c, parser) != 0)
 		return EOF; /* FIXME report error */
 	for(i = 0; i < parser->filters_cnt; i++)
 	{
 		pfd = &parser->filters[i];
-		if((l = pfd->filter(&c, pfd->data)) < 0)
+		if(pfd->filter(&c, pfd->data) != 0)
 			return EOF;
-		parser->lookahead += l;
 	}
 	parser->last = c;
 	return c;
@@ -181,6 +188,7 @@ static Parser * _new_do(ParserFilter scanner)
 
 	if((parser = object_new(sizeof(*parser))) == NULL)
 		return NULL;
+	parser->inject = NULL;
 	parser->filename = NULL;
 	parser->fp = NULL;
 	parser->string = NULL;
@@ -189,7 +197,6 @@ static Parser * _new_do(ParserFilter scanner)
 	parser->line = 1;
 	parser->col = 1;
 	parser->last = EOF;
-	parser->lookahead = 0;
 	parser->scanner = scanner;
 	parser->filters = NULL;
 	parser->filters_cnt = 0;
@@ -231,6 +238,7 @@ int parser_delete(Parser * parser)
 	fprintf(stderr, "DEBUG: %s(%p) \"%s\"\n", __func__, parser,
 			parser->filename);
 #endif
+	free(parser->inject);
 	if(parser->fp != NULL
 			&& fclose(parser->fp) != 0)
 		ret = error_set_code(1, "%s: %s", parser->filename,
@@ -282,6 +290,15 @@ int parser_get_token(Parser * parser, Token ** token)
 }
 
 
+#if 0
+/* parser_set_lookahead */
+void parser_set_lookahead(Parser * parser, unsigned int lookahead)
+{
+	parser->lookahead = lookahead;
+}
+#endif
+
+
 /* useful */
 /* parser_add_callback */
 int parser_add_callback(Parser * parser, ParserCallback callback, void * data)
@@ -318,6 +335,30 @@ int parser_add_filter(Parser * parser, ParserFilter filter, void * data)
 }
 
 
+/* parser_inject */
+int parser_inject(Parser * parser, char const * string)
+{
+	int c;
+	char buf[2] = "\0";
+
+	if(string == NULL || string[0] == '\0')
+		return 0; /* don't bother */
+	c = parser->last;
+	parser->last = string[0];
+	if(parser->inject == NULL)
+	{
+		if((parser->inject = string_new(&string[1])) == NULL)
+			return -1;
+	}
+	else if(string_append(&parser->inject, &string[1]) != 0)
+		return -1;
+	buf[0] = c;
+	if(c != EOF && string_append(&parser->inject, buf) != 0)
+		return -1;
+	return 0;
+}
+
+
 /* parser_remove_callback */
 int parser_remove_callback(Parser * parser, ParserCallback callback)
 	/* FIXME untested */
diff --git a/src/project.conf b/src/project.conf
index 4786595..ffdc414 100644
--- a/src/project.conf
+++ b/src/project.conf
@@ -7,7 +7,7 @@ dist=Makefile,token.h
 
 [libSystem]
 type=library
-sources=array.c,buffer.c,config.c,error.c,event.c,hash.c,object.c,parser.c,plugin.c,string.c,token.c
+sources=array.c,buffer.c,config.c,error.c,event.c,hash.c,object.c,parser.c,plugin.c,string.c,token.c,variable.c
 ldflags=-ldl
 install=$(LIBDIR)
 
diff --git a/src/string.c b/src/string.c
index b68f041..4c34820 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1,5 +1,5 @@
 /* $Id$ */
-/* Copyright (c) 2010 Pierre Pronchery <khorben@defora.org> */
+/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
 /* This file is part of DeforaOS System libSystem */
 /* This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -249,3 +249,38 @@ ssize_t string_index(String const * string, String const * key)
 		return -1;
 	return i;
 }
+
+
+/* string_replace */
+int string_replace(String ** string, String const * what, String const * by)
+{
+	String * ret = NULL;
+	String const * p;
+	size_t len = string_length(what);
+	ssize_t index;
+	String * q;
+
+	for(p = *string; (index = string_index(p, what)) >= 0; p += index + len)
+	{
+		if((q = string_new_length(p, index)) == NULL
+				|| string_append(&ret, q) != 0
+				|| string_append(&ret, by) != 0)
+		{
+			string_delete(q);
+			string_delete(ret);
+			return -1;
+		}
+		string_delete(q);
+	}
+	if(ret != NULL)
+	{
+		if(string_append(&ret, p) != 0)
+		{
+			string_delete(ret);
+			return -1;
+		}
+		string_delete(*string);
+		*string = ret;
+	}
+	return 0;
+}