3 files changed, 55 insertions, 0 deletions
diff --git a/util/count.js b/util/count.js
new file mode 100644
index 0000000..7df97a7
--- /dev/null
+++ b/util/count.js
@@ -0,0 +1,17 @@
+module.exports = function count(arr) {
+  // Counts the number of times the items of an array appear (only on the top
+  // level; it doesn't search through nested arrays!). Returns a map of
+  // item -> count.
+
+  const map = new Map()
+
+  for (let item of arr) {
+    if (map.has(item)) {
+      map.set(item, map.get(item) + 1)
+    } else {
+      map.set(item, 1)
+    }
+  }
+
+  return map
+}
diff --git a/util/smoothen.js b/util/smoothen.js
new file mode 100644
index 0000000..55ba23c
--- /dev/null
+++ b/util/smoothen.js
@@ -0,0 +1,16 @@
+module.exports = function(tx, x, divisor) {
+  // Smoothly transitions givens X to TX using a given divisor. Rounds the
+  // amount moved.
+
+  const move = (tx - x) / divisor
+
+  if (move > 0.5) {
+    return x + Math.ceil(move)
+  } else if (move < -0.5) {
+    return x + Math.floor(move)
+  } else if (tx > 0) {
+    return Math.ceil(tx)
+  } else {
+    return Math.floor(tx)
+  }
+}
diff --git a/util/wrap.js b/util/wrap.js
new file mode 100644
index 0000000..78e5233
--- /dev/null
+++ b/util/wrap.js
@@ -0,0 +1,22 @@
+module.exports = function wrap(str, width) {
+  // Wraps a string into separate lines. Returns an array of strings, for
+  // each line of the text.
+
+  const lines = []
+  const words = str.split(' ')
+
+  let curLine = words[0]
+
+  for (let word of words.slice(1)) {
+    if (curLine.length + word.length > width) {
+      lines.push(curLine)
+      curLine = word
+    } else {
+      curLine += ' ' + word
+    }
+  }
+
+  lines.push(curLine)
+
+  return lines
+}