Roll small URL lib

2 files changed, 45 insertions, 0 deletions

diff --git a/src/lib/url.js b/src/lib/url.js
new file mode 100644
index 0000000..b3ef40c
--- /dev/null
+++ b/src/lib/url.js
@@ -0,0 +1,25 @@
+import { location, history } from 'browser-monads'
+export const parseQuery = ({ search } = location) =>
+  search && parseQueryString(search)
+
+const parseQueryString = query =>
+  query
+    .split('?')[1]
+    .split('&')
+    .reduce((acc, pair) => {
+      const [key, val] = pair.split('=')
+      return {
+        ...acc,
+        [key]: val
+      }
+    }, {})
+
+export const objectToQuery = query =>
+  Object.entries(query).reduce(
+    (acc, [key, val], i) => acc + `${i !== 0 ? '&' : ''}${key}=${val}`,
+    '?'
+  )
+
+export const writeQuery = (queryObj, { pushState } = history) => {
+  pushState({}, '', objectToQuery(queryObj))
+}
diff --git a/src/lib/url.test.js b/src/lib/url.test.js
new file mode 100644
index 0000000..76137b8
--- /dev/null
+++ b/src/lib/url.test.js
@@ -0,0 +1,20 @@
+import { parseQuery as parseQueryGlobal, objectToQuery } from './url'
+
+const parseQuery = search =>
+  parseQueryGlobal({
+    search
+  })
+
+test('parseQuery', () => {
+  expect(parseQuery('?mySearch=myVal')).toEqual({ mySearch: 'myVal' })
+  expect(parseQuery('?mySearch=myVal&againWith=aVal')).toEqual({
+    mySearch: 'myVal',
+    againWith: 'aVal'
+  })
+  // test that these 2 functions are inverses
+  // (e.g composing them produces `const f = k => k`)
+  let input = '?big=long&one=eh'
+  expect(objectToQuery(parseQuery(input))).toEqual(input)
+  input = { args: 'hi', onArgs: 'helloagain' }
+  expect(parseQuery(objectToQuery(input))).toEqual(input)
+})