Follow the XDG Base Directory Specification

kernel/driver.cc

@@ -244,11 +244,35 @@ int main(int argc, char **argv)
 	bool mode_q = false;
 
 #if defined(YOSYS_ENABLE_READLINE) || defined(YOSYS_ENABLE_EDITLINE)
-	if (getenv("HOME") != NULL) {
-		yosys_history_file = stringf("%s/.yosys_history", getenv("HOME"));
-		read_history(yosys_history_file.c_str());
-		yosys_history_offset = where_history();
-	}
+    std::string state_dir;
+    #if defined(_WIN32)
+        if (getenv("HOMEDRIVE") != NULL && getenv("HOMEPATH") != NULL) {
+            state_dir = stringf("%s%s/.local/state", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
+        } else {
+            log("$HOMEDRIVE and/or $HOMEPATH is empty. No history file will be created.");
+        }
+    #else
+        if (getenv("XDG_STATE_HOME") == NULL || getenv("XDG_STATE_HOME")[0] == '\0') {
+            if (getenv("HOME") != NULL) {
+                state_dir = stringf("%s/.local/state", getenv("HOME"));
+            } else {
+                log("$HOME is empty. No history file will be created.");
+            }
+        } else {
+            state_dir = stringf("%s", getenv("XDG_STATE_HOME"));
+        }
+    #endif
+
+    if (!state_dir.empty()) {
+        std::string yosys_dir = state_dir + "/yosys";
+        create_directory(yosys_dir);
+
+        yosys_history_file = yosys_dir + "/history";
+        read_history(yosys_history_file.c_str());
+        yosys_history_offset = where_history();
+    } else {
+        log("state_dir is empty. No history file will be created.");
+    }
 #endif
 
 	if (argc == 2 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-help") || !strcmp(argv[1], "--help")))

kernel/yosys.cc

@@ -436,6 +436,25 @@ std::string make_temp_dir(std::string template_str)
 #endif
 }
 
+bool check_directory_exists(const std::string& dirname)
+{
+#if defined(_WIN32)
+	struct _stat info;
+	if (_stat(dirname.c_str(), &info) != 0)
+	{
+		return false;
+	}
+	return (info.st_mode & _S_IFDIR) != 0;
+#else
+	struct stat info;
+	if (stat(dirname.c_str(), &info) != 0)
+	{
+		return false;
+	}
+	return (info.st_mode & S_IFDIR) != 0;
+#endif
+}
+
 #ifdef _WIN32
 bool check_file_exists(std::string filename, bool)
 {
@@ -481,6 +500,48 @@ void remove_directory(std::string dirname)
 #endif
 }
 
+bool create_directory(const std::string& dirname)
+{
+#if defined(_WIN32)
+	int ret = _mkdir(dirname.c_str());
+#else
+	mode_t mode = 0755;
+	int ret = mkdir(dirname.c_str(), mode);
+#endif
+	if (ret == 0)
+		return true;
+
+	switch (errno)
+	{
+	case ENOENT:
+		// parent didn't exist, try to create it
+		{
+			std::string::size_type pos = dirname.find_last_of('/');
+			if (pos == std::string::npos)
+#if defined(_WIN32)
+				pos = dirname.find_last_of('\\');
+			if (pos == std::string::npos)
+#endif
+				return false;
+			if (!create_directory( dirname.substr(0, pos) ))
+				return false;
+		}
+		// now, try to create again
+#if defined(_WIN32)
+		return 0 == _mkdir(dirname.c_str());
+#else
+		return 0 == mkdir(dirname.c_str(), mode);
+#endif
+
+	case EEXIST:
+		// done!
+		return check_directory_exists(dirname);
+
+	default:
+		return false;
+	}
+}
+
 std::string escape_filename_spaces(const std::string& filename)
 {
 	std::string out;
@@ -781,10 +842,10 @@ static int tcl_yosys_cmd(ClientData, Tcl_Interp *interp, int argc, const char *a
 
 int yosys_tcl_iterp_init(Tcl_Interp *interp)
 {
-    if (Tcl_Init(interp)!=TCL_OK)
+	if (Tcl_Init(interp)!=TCL_OK)
 		log_warning("Tcl_Init() call failed - %s\n",Tcl_ErrnoMsg(Tcl_GetErrno()));
 	Tcl_CreateCommand(interp, "yosys", tcl_yosys_cmd, NULL, NULL);
-    return TCL_OK ;
+	return TCL_OK ;
 }
 
 void yosys_tcl_activate_repl()

kernel/yosys.h

@@ -66,6 +66,8 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <limits.h>
+#include <sys/stat.h>
+#include <errno.h>
 
 #ifdef WITH_PYTHON
 #include <Python.h>
@@ -341,8 +343,10 @@ std::string get_base_tmpdir();
 std::string make_temp_file(std::string template_str = get_base_tmpdir() + "/yosys_XXXXXX");
 std::string make_temp_dir(std::string template_str = get_base_tmpdir() + "/yosys_XXXXXX");
 bool check_file_exists(std::string filename, bool is_exec = false);
+bool check_directory_exists(const std::string& dirname);
 bool is_absolute_path(std::string filename);
 void remove_directory(std::string dirname);
+bool create_directory(const std::string& dirname);
 std::string escape_filename_spaces(const std::string& filename);
 
 template<typename T> int GetSize(const T &obj) { return obj.size(); }