From c0ca99483c1c0966305ced16a9a7e00e4c5ecce0 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Tue, 20 Jun 2017 04:41:58 +0200
Subject: [PATCH] Store command history when terminating with an error

---
 kernel/driver.cc | 43 ++++++++++++++++++++++++++-----------------
 kernel/log.cc    |  4 ++++
 kernel/log.h     |  1 +
 3 files changed, 31 insertions(+), 17 deletions(-)

diff --git a/kernel/driver.cc b/kernel/driver.cc
index 7d714d079..0d331712c 100644
--- a/kernel/driver.cc
+++ b/kernel/driver.cc
@@ -119,6 +119,29 @@ const char *prompt()
 
 #else /* EMSCRIPTEN */
 
+#ifdef YOSYS_ENABLE_READLINE
+int history_offset = 0;
+std::string history_file;
+#endif
+
+void yosys_atexit()
+{
+#ifdef YOSYS_ENABLE_READLINE
+	if (!history_file.empty()) {
+		if (history_offset > 0) {
+			history_truncate_file(history_file.c_str(), 100);
+			append_history(where_history() - history_offset, history_file.c_str());
+		} else
+			write_history(history_file.c_str());
+	}
+
+	clear_history();
+	HIST_ENTRY **hist_list = history_list();
+	if (hist_list != NULL)
+		free(hist_list);
+#endif
+}
+
 int main(int argc, char **argv)
 {
 	std::string frontend_command = "auto";
@@ -137,8 +160,6 @@ int main(int argc, char **argv)
 	bool mode_q = false;
 
 #ifdef YOSYS_ENABLE_READLINE
-	int history_offset = 0;
-	std::string history_file;
 	if (getenv("HOME") != NULL) {
 		history_file = stringf("%s/.yosys_history", getenv("HOME"));
 		read_history(history_file.c_str());
@@ -379,6 +400,7 @@ int main(int argc, char **argv)
 		log_hasher = new SHA1;
 
 	yosys_setup();
+	log_error_atexit = yosys_atexit;
 
 	for (auto &fn : plugin_filenames)
 		load_plugin(fn, {});
@@ -509,25 +531,12 @@ int main(int argc, char **argv)
 	}
 #endif
 
+	yosys_atexit();
+
 	memhasher_off();
 	if (call_abort)
 		abort();
 
-#ifdef YOSYS_ENABLE_READLINE
-	if (!history_file.empty()) {
-		if (history_offset > 0) {
-			history_truncate_file(history_file.c_str(), 100);
-			append_history(where_history() - history_offset, history_file.c_str());
-		} else
-			write_history(history_file.c_str());
-	}
-
-	clear_history();
-	HIST_ENTRY **hist_list = history_list();
-	if (hist_list != NULL)
-		free(hist_list);
-#endif
-
 	log_flush();
 #if defined(_MSC_VER)
 	_exit(0);
diff --git a/kernel/log.cc b/kernel/log.cc
index c7240d540..3768922cd 100644
--- a/kernel/log.cc
+++ b/kernel/log.cc
@@ -52,6 +52,7 @@ bool log_cmd_error_throw = false;
 bool log_quiet_warnings = false;
 int log_verbose_level;
 string log_last_error;
+void (*log_error_atexit)() = NULL;
 
 vector<int> header_count;
 pool<RTLIL::IdString> log_id_cache;
@@ -244,6 +245,9 @@ void logv_error(const char *format, va_list ap)
 	log("ERROR: %s", log_last_error.c_str());
 	log_flush();
 
+	if (log_error_atexit)
+		log_error_atexit();
+
 #ifdef EMSCRIPTEN
 	log_files = backup_log_files;
 	throw 0;
diff --git a/kernel/log.h b/kernel/log.h
index 34c309016..6cae4431d 100644
--- a/kernel/log.h
+++ b/kernel/log.h
@@ -60,6 +60,7 @@ extern bool log_cmd_error_throw;
 extern bool log_quiet_warnings;
 extern int log_verbose_level;
 extern string log_last_error;
+extern void (*log_error_atexit)();
 
 void logv(const char *format, va_list ap);
 void logv_header(RTLIL::Design *design, const char *format, va_list ap);
-- 
2.30.2