web: add undo ability; simplify prompt handlers

Undo currently works only for ongoing matches.

1 files changed, 31 insertions, 28 deletions

diff --git a/web/static/dartboat.js b/web/static/dartboat.js
index 07c8997..6a0d07b 100644
--- a/web/static/dartboat.js
+++ b/web/static/dartboat.js
@@ -32,7 +32,7 @@ function _promptGet() {
 
 function _promptGetAndClear() {
 	let val = _promptGet();
-	promptClear();
+	promptHandle('clear');
 	return val;
 }
 
@@ -78,6 +78,19 @@ let prompt_handlers = {
 				Module.ccall('user_visit_to_rem', 'number', ['number'], [rem]);
 		},
 
+		undo() {
+			let cl = document.getElementById('key_undo').classList;
+			if (cl.contains('active'))
+				Module.ccall('user_undo');
+			cl.toggle('active');
+		},
+
+		pre(action) {
+			clearOi();
+			if (action != 'undo')
+				document.getElementById('key_undo').classList.remove('active');
+		},
+
 		_update_rem(val) {
 			Module.ccall('update_user_rem_from_pts', null,
 				['number'], [val || _promptGet()]);
@@ -103,12 +116,20 @@ let prompt_handlers = {
 			let n = _promptGetAndClear();
 			if (n)
 				Module.ccall('resp_numdarts', null, ['number'], [n]);
+		},
+
+		pre(action) {
+			clearOi();
 		}
 	},
 
 	init: {
 		submit() {
 			Module.ccall('start_match');
+		},
+
+		pre(action) {
+			clearOi();
 		}
 	}
 }
@@ -117,29 +138,9 @@ function setPromptHandler(ptr) {
 	prompt_handler = prompt_handlers[UTF8ToString(ptr)];
 }
 
-function promptAppend(...args) {
-	clearOi();
-	prompt_handler?.append?.(...args);
-}
-
-function promptClear(...args) {
-	clearOi();
-	prompt_handler?.clear?.(...args);
-}
-
-function promptBackspace(...args) {
-	clearOi();
-	prompt_handler?.backspace?.(...args);
-}
-
-function promptSubmit(...args) {
-	clearOi();
-	prompt_handler?.submit?.(...args);
-}
-
-function promptSubmitRem(...args) {
-	clearOi();
-	prompt_handler?.submit_rem?.(...args);
+function promptHandle(action, ...args) {
+	prompt_handler?.pre?.(action);
+	prompt_handler?.[action]?.(...args);
 }
 
 function setPromptInput(ptr) {
@@ -239,11 +240,13 @@ document.addEventListener('keydown', e => {
 		return;
 
 	if (isFinite(e.key))
-		promptAppend(e.key);
+		promptHandle('append', e.key);
 	else if (e.key == 'Enter')
-		promptSubmit();
+		promptHandle('submit');
 	else if (e.key == 'Backspace')
-		promptBackspace();
+		promptHandle('backspace');
 	else if (e.key == 'r')
-		promptSubmitRem();
+		promptHandle('submit_rem');
+	else if (e.key == 'u')
+		promptHandle('undo');
 });