colored error messages that tell the source file

1 files changed, 38 insertions, 0 deletions

diff --git a/src/errmsg.cpp b/src/errmsg.cpp
new file mode 100644
index 0000000000..36d203a48f
--- /dev/null
+++ b/src/errmsg.cpp
@@ -0,0 +1,38 @@
+#include "errmsg.hpp"
+#include "os.hpp"
+
+#include <stdio.h>
+
+#define RED "\x1b[31;1m"
+#define WHITE "\x1b[37;1m"
+#define GREEN "\x1b[32;1m"
+#define RESET "\x1b[0m"
+
+void print_err_msg(ErrorMsg *err) {
+    if (os_stderr_tty()) {
+        fprintf(stderr, WHITE "%s:%d:%d: " RED "error:" WHITE " %s" RESET "\n",
+                buf_ptr(err->path),
+                err->line_start + 1, err->column_start + 1,
+                buf_ptr(err->msg));
+
+        assert(err->source);
+        assert(err->line_offsets);
+
+        int line_start_offset = err->line_offsets->at(err->line_start);
+        int line_end_offset = err->line_offsets->at(err->line_start + 1);
+
+        fwrite(buf_ptr(err->source) + line_start_offset, 1, line_end_offset - line_start_offset - 1, stderr);
+        fprintf(stderr, "\n");
+        for (int i = 0; i < err->column_start; i += 1) {
+            fprintf(stderr, " ");
+        }
+        fprintf(stderr, GREEN "^" RESET "\n");
+
+    } else {
+        fprintf(stderr, "%s:%d:%d: error: %s\n",
+                buf_ptr(err->path),
+                err->line_start + 1, err->column_start + 1,
+                buf_ptr(err->msg));
+    }
+}
+