Add yamldumper utility

Just dumps YAML parser events to the console. Handy for a few things I'm pondering...

util/yamldumper/SConscript

@@ -0,0 +1,8 @@
+# SConscript
+# vim: set ft=python:
+# Eryn Wells <eryn@erynwells.me>
+
+Import('env')
+
+prog = env.Program('yamldumper', ['yamldumper.cc'], LIBS=['yaml'])
+env.Alias('yamldumper', prog)

util/yamldumper/yamldumper.cc

@@ -0,0 +1,101 @@
+/* yamldumper.cc
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+/**
+ * A small utility that reads a YAML file and dumps the parser events.
+ */
+
+#include <cstdio>
+#include <iostream>
+
+#include "yaml.h"
+
+
+int
+main(int argc,
+     char* argv[])
+{
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s [yaml_file ...]\n", argv[0]);
+        return -1;
+    }
+
+    bool writeNewline = false;
+    for (int i = 1; i < argc; i++) {
+        if (writeNewline) {
+            printf("\n");
+        }
+
+        printf("--- %s\n", argv[i]);
+
+        yaml_parser_t parser;
+        yaml_parser_initialize(&parser);
+
+        FILE *f = fopen(argv[i], "rb");
+        if (!f) {
+            fprintf(stderr, "Couldn't open file.\n");
+        }
+        yaml_parser_set_input_file(&parser, f);
+
+        bool done = false;
+        yaml_event_t event;
+        while (!done) {
+            if (!yaml_parser_parse(&parser, &event)) {
+                fprintf(stderr, "Error parsing file.\n");
+                goto error;
+            }
+
+            switch (event.type) {
+                case YAML_NO_EVENT:
+                    std::cout << "YAML_NO_EVENT\n";
+                    break;
+
+                case YAML_STREAM_START_EVENT:
+                    std::cout << "YAML_STREAM_START_EVENT\n";
+                    break;
+                case YAML_STREAM_END_EVENT:
+                    std::cout << "YAML_STREAM_END_EVENT\n";
+                    break;
+
+                case YAML_DOCUMENT_START_EVENT:
+                    std::cout << "YAML_DOCUMENT_START_EVENT\n";
+                    break;
+                case YAML_DOCUMENT_END_EVENT:
+                    std::cout << "YAML_DOCUMENT_END_EVENT\n";
+                    break;
+
+                case YAML_ALIAS_EVENT:
+                    std::cout << "YAML_ALIAS_EVENT\n";
+                    break;
+                case YAML_SCALAR_EVENT:
+                    std::cout << "YAML_SCALAR_EVENT\n";
+                    break;
+
+                case YAML_SEQUENCE_START_EVENT:
+                    std::cout << "YAML_SEQUENCE_START_EVENT\n";
+                    break;
+                case YAML_SEQUENCE_END_EVENT:
+                    std::cout << "YAML_SEQUENCE_END_EVENT\n";
+                    break;
+
+                case YAML_MAPPING_START_EVENT:
+                    std::cout << "YAML_MAPPING_START_EVENT\n";
+                    break;
+                case YAML_MAPPING_END_EVENT:
+                    std::cout << "YAML_MAPPING_END_EVENT\n";
+                    break;
+            }
+
+            done = (event.type == YAML_STREAM_END_EVENT);
+            yaml_event_delete(&event);
+        } /* while (!done) */
+
+error:
+        yaml_parser_delete(&parser);
+        fclose(f);
+        writeNewline = true;
+    } /* for file : argv */
+
+    return 0;
+}