formatting function

2 files changed, 19 insertions, 1 deletions

diff --git a/mod.ts b/mod.ts
index d61e0e7..0657b94 100644
--- a/mod.ts
+++ b/mod.ts
@@ -5,6 +5,7 @@
 */
 import { e } from "./src/element.ts";
 import { OVar } from "./src/observable.ts";
+import * as show from "./src/show.ts";
 
-export { OVar, e };
+export { OVar, e, show };
 
diff --git a/src/show.ts b/src/show.ts
new file mode 100644
index 0000000..193a93b
--- /dev/null
+++ b/src/show.ts
@@ -0,0 +1,17 @@
+
+export function byte_size(x: number): string {
+    if (x > 1000000000) return (x / 1000000000).toFixed(1) + "G"
+    if (x > 1000000) return (x / 1000000).toFixed(1) + "M"
+    if (x > 1000) return (x / 1000).toFixed(1) + "k"
+    return x.toString()
+}
+
+export function duration(t: number): string {
+    if (t < 0) return "-" + duration(-t)
+    let h = 0, m = 0, s = 0;
+    while (t > 3600) t -= 3600, h++;
+    while (t > 60) t -= 60, m++;
+    while (t > 1) t -= 1, s++;
+    return (h ? h + "h" : "") + (m ? m + "m" : "") + (s ? s + "s" : "")
+}
+