logging: reset style only on tty

src/debug.cpp

@@ -130,7 +130,8 @@ void log_msg(int level, const char *format, ...)
         }
         va_end(ap);
 
-        buf.append(TERM_RESET);
+        if(get_log_output().is_interactive())
+                buf.append(TERM_RESET);
         buf.submit();
 }
 

src/debug.h

@@ -154,6 +154,7 @@ public:
         void set_timestamp_mode(log_timestamp_mode val) { show_timestamps = val; }
 
         const std::string& get_level_style(int lvl);
+        bool is_interactive() const { return interactive; }
 
         Log_output(const Log_output&) = delete;
         Log_output(Log_output&&) = delete;