libcrystfel plumbing to allow ERROR/STATUS messages in GUI

3 files changed, 59 insertions, 24 deletions

diff --git a/libcrystfel/src/thread-pool.c b/libcrystfel/src/thread-pool.c
index 67645b1e..1d85e0be 100644
--- a/libcrystfel/src/thread-pool.c
+++ b/libcrystfel/src/thread-pool.c
@@ -47,7 +47,6 @@
 
 static int use_status_labels = 0;
 static pthread_key_t status_label_key;
-pthread_mutex_t stderr_lock = PTHREAD_MUTEX_INITIALIZER;
 
 struct worker_args
 {
diff --git a/libcrystfel/src/utils.c b/libcrystfel/src/utils.c
index 0c01c069..694e76bc 100644
--- a/libcrystfel/src/utils.c
+++ b/libcrystfel/src/utils.c
@@ -720,3 +720,49 @@ char *load_entire_file(const char *filename)
 
 	return contents;
 }
+
+
+/* ------------------------------ Message logging ---------------------------- */
+
+/* Lock to keep lines serialised on the terminal */
+pthread_mutex_t stderr_lock = PTHREAD_MUTEX_INITIALIZER;
+
+
+static void log_to_stderr(enum log_msg_type type, const char *msg)
+{
+	int error_print_val = get_status_label();
+	pthread_mutex_lock(&stderr_lock);
+	if ( error_print_val >= 0 ) {
+		fprintf(stderr, "%3i: ", error_print_val);
+	}
+	fprintf(stderr, "%s", msg);
+	pthread_mutex_unlock(&stderr_lock);
+}
+
+
+/* Function to call with ERROR/STATUS messages */
+void (*log_msg_func)(enum log_msg_type type, const char *) = log_to_stderr;
+
+
+void set_log_message_func(void (*new_log_msg_func)(enum log_msg_type type, const char *))
+{
+	log_msg_func = new_log_msg_func;
+}
+
+
+void STATUS(const char *format, ...)
+{
+	va_list args;
+	char tmp[1024];
+	vsnprintf(tmp, 1024, format, args);
+	log_msg_func(LOG_MSG_STATUS, tmp);
+}
+
+
+void ERROR(const char *format, ...)
+{
+	va_list args;
+	char tmp[1024];
+	vsnprintf(tmp, 1024, format, args);
+	log_msg_func(LOG_MSG_ERROR, tmp);
+}
diff --git a/libcrystfel/src/utils.h b/libcrystfel/src/utils.h
index f406ef6c..fcdde453 100644
--- a/libcrystfel/src/utils.h
+++ b/libcrystfel/src/utils.h
@@ -193,29 +193,19 @@ static inline int within_tolerance(double a, double b, double percent)
 #define ph_eV_to_k(a) ((a)*ELECTRON_CHARGE/PLANCK/C_VACUO)
 
 
-/* ------------------------------ Message macros ---------------------------- */
-
-extern pthread_mutex_t stderr_lock;
-
-#define ERROR(...) { \
-                      int error_print_val = get_status_label(); \
-                      pthread_mutex_lock(&stderr_lock); \
-                      if ( error_print_val >= 0 ) { \
-                         fprintf(stderr, "%3i: ", error_print_val); \
-                      } \
-                      fprintf(stderr, __VA_ARGS__); \
-                      pthread_mutex_unlock(&stderr_lock); \
-                   }
-
-#define STATUS(...) { \
-                       int status_print_val = get_status_label(); \
-                       pthread_mutex_lock(&stderr_lock); \
-                       if ( status_print_val >= 0 ) { \
-                          fprintf(stderr, "%3i: ", status_print_val); \
-                       } \
-                       fprintf(stderr, __VA_ARGS__); \
-                       pthread_mutex_unlock(&stderr_lock); \
-                    }
+/* ------------------------------ Message logging ---------------------------- */
+
+
+enum log_msg_type {
+                   LOG_MSG_STATUS,
+                   LOG_MSG_ERROR
+};
+
+
+extern void STATUS(const char *format, ...);
+extern void ERROR(const char *format, ...);
+
+extern void set_log_message_func(void (*new_log_msg_func)(enum log_msg_type type, const char *));
 
 
 /* ------------------------------ File handling ----------------------------- */