add pattern methods hurry, press and pressBy (#397)

packages/core/pattern.mjs

@@ -1603,6 +1603,15 @@ export const { fast, density } = register(['fast', 'density'], function (factor,
   return fastQuery.withHapTime((t) => t.div(factor));
 });
 
+/**
+ * Both speeds up the pattern (like 'fast') and the sample playback (like 'speed').
+ * @example
+ * s("bd sd:2").hurry("<1 2 4 3>").slow(1.5)
+ */
+export const hurry = register('hurry', function (r, pat) {
+  return pat._fast(r).mul(pure({ speed: r }));
+});
+
 /**
  * Slow down a pattern over the given number of cycles. Like the "/" operator in mini notation.
  *
@@ -1857,6 +1866,29 @@ export const rev = register('rev', function (pat) {
   return new Pattern(query).splitQueries();
 });
 
+/** Like press, but allows you to specify the amount by which each
+ * event is shifted. pressBy(0.5) is the same as press, while
+ * pressBy(1/3) shifts each event by a third of its timespan.
+ * @example
+ * stack(s("hh*4"),
+ *       s("bd mt sd ht").pressBy("<0 0.5 0.25>")
+ *      ).slow(2)
+ */
+export const pressBy = register('pressBy', function (r, pat) {
+  return pat.fmap((x) => pure(x).compress(r, 1)).squeezeJoin();
+});
+
+/**
+ * Syncopates a rhythm, by shifting each event halfway into its timespan.
+ * @example
+ * stack(s("hh*4"),
+ *       s("bd mt sd ht").every(4, press)
+ *      ).slow(2)
+ */
+export const press = register('press', function (pat) {
+  return pat._pressBy(0.5);
+});
+
 /**
  * Silences a pattern.
  * @example

packages/core/test/pattern.test.mjs

@@ -949,4 +949,14 @@ describe('Pattern', () => {
       expect(stack(sequence('a', silence), pure('a').mask(0, 1)).defragmentHaps().firstCycle().length).toStrictEqual(2);
     });
   });
+  describe('press', () => {
+    it('Can syncopate events', () => {
+      sameFirst(sequence('a', 'b', 'c', 'd').press(), sequence(silence, 'a', silence, 'b', silence, 'c', silence, 'd'));
+    });
+  });
+  describe('hurry', () => {
+    it('Can speed up patterns and sounds', () => {
+      sameFirst(s('a', 'b').hurry(2), s('a', 'b').fast(2).speed(2));
+    });
+  });
 });