add basic logging and CLI options

1 files changed, 60 insertions, 1 deletions

diff --git a/experimental/tectonics/tectonics.c b/experimental/tectonics/tectonics.c
index 7d5342a..0a81b45 100644
--- a/experimental/tectonics/tectonics.c
+++ b/experimental/tectonics/tectonics.c
@@ -2,12 +2,21 @@
 
 #include "tectonics.h"
 #include "drawing.h"
+#include "logging.h"
 
 #define X_RES 1024
 #define Y_RES X_RES
 
-int main()
+
+int parse_options(char **output_file, int argc, char **argv);
+   
+
+int main(int argc, char **argv)
 {
+   char *output_file;
+   if (parse_options(&output_file, argc, argv))
+      return 1;
+   
    cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, X_RES, Y_RES);
    cairo_t *cr = cairo_create(surface);
 
@@ -23,3 +32,53 @@ int main()
    cairo_surface_destroy(surface);
    return 0;
 }
+
+
+#include <stdio.h>
+#include <unistd.h>
+
+static void print_usage(const char *progname)
+{
+   printf("Usage: %s [-c config_file] [-v[v[v]]] [-q[q[q]]] [-h] [-s script]\n"
+	  "  -v    Increase output verbosity (-vvv displays every log message)\n"
+	  "  -q    Decrease output verbosity (-qqq suppresses even fatal errors)\n"
+	  "  -c    Specify configuration file to read (default 'config.lua')\n"
+	  "  -s    Override the built-in Lua script\n"
+	  "  -h    Print this help message and exit\n",
+	  progname);	  
+}
+
+int parse_options(char **output_file, int argc, char **argv)
+{
+   int log_level = WARN;
+   *output_file = "output.png";
+   
+   int opt;
+   while ((opt = getopt(argc, argv, "qvo:h")) != -1) {
+      switch (opt) {
+      case 'q':
+	 log_level -= 1;
+	 break;
+	 
+      case 'v':
+	 log_level += 1;
+	 break;
+	 
+      case 'o':
+	 *output_file = optarg;
+
+      case 'h':
+	 print_usage(argv[0]);
+	 return 2;
+
+      default:
+	 print_usage(argv[0]);
+	 return 1;
+      }
+   }
+
+   // ew, globals (sorry)
+   global_log_level = log_level;
+
+   return 0;
+}