Only trim `.odin` from build filenames

src/build_settings.cpp

@@ -2209,11 +2209,34 @@ gb_internal bool init_build_paths(String init_filename) {
 			while (output_name.len > 0 && (output_name[output_name.len-1] == '/' || output_name[output_name.len-1] == '\\')) {
 				output_name.len -= 1;
 			}
+			// Only trim the extension if it's an Odin source file.
+			// This lets people build folders with extensions or files beginning with dots.
+			if (path_extension(output_name) == ".odin" && !path_is_directory(output_name)) {
+				output_name = remove_extension_from_path(output_name);
+			}
 			output_name = remove_directory_from_path(output_name);
-			output_name = remove_extension_from_path(output_name);
 			output_name = copy_string(ha, string_trim_whitespace(output_name));
-			output_path = path_from_string(ha, output_name);
-			
+			// This is `path_from_string` without the extension trimming.
+			Path res = {};
+			if (output_name.len > 0) {
+				String fullpath = path_to_full_path(ha, output_name);
+				defer (gb_free(ha, fullpath.text));
+
+				res.basename = directory_from_path(fullpath);
+				res.basename = copy_string(ha, res.basename);
+
+				if (path_is_directory(fullpath)) {
+					if (res.basename.len > 0 && res.basename.text[res.basename.len - 1] == '/') {
+						res.basename.len--;
+					}
+				} else {
+					isize name_start = (res.basename.len > 0) ? res.basename.len + 1 : res.basename.len;
+					res.name         = substring(fullpath, name_start, fullpath.len);
+					res.name         = copy_string(ha, res.name);
+				}
+			}
+			output_path = res;
+
 			// Note(Dragos): This is a fix for empty filenames
 			// Turn the trailing folder into the file name
 			if (output_path.name.len == 0) {