Add language filtering UI to search (#5459)

* Use new TextField for search bar

* Add lang dropdown

* Dialog

* Revert "Dialog"

This reverts commit 257573cd9c.

* Extract util, test, cleanup

* Fix formatting

* Pass through other params

* Fix sticky header

* Fix stale data, hide/show

* Improve query parsing

* Replace memo

* Couple tweaks

* Revert cancel change

* Remove unused placeholder

src/screens/Search/__tests__/utils.test.ts

@@ -0,0 +1,43 @@
+import {describe, expect, it} from '@jest/globals'
+
+import {parseSearchQuery} from '#/screens/Search/utils'
+
+describe(`parseSearchQuery`, () => {
+  const tests = [
+    {
+      input: `bluesky`,
+      output: {query: `bluesky`, params: {}},
+    },
+    {
+      input: `bluesky from:esb.lol`,
+      output: {query: `bluesky`, params: {from: `esb.lol`}},
+    },
+    {
+      input: `bluesky "from:esb.lol"`,
+      output: {query: `bluesky "from:esb.lol"`, params: {}},
+    },
+    {
+      input: `bluesky mentions:@esb.lol`,
+      output: {query: `bluesky`, params: {mentions: `@esb.lol`}},
+    },
+    {
+      input: `bluesky since:2021-01-01:00:00:00`,
+      output: {query: `bluesky`, params: {since: `2021-01-01:00:00:00`}},
+    },
+    {
+      input: `bluesky lang:"en"`,
+      output: {query: `bluesky`, params: {lang: `en`}},
+    },
+    {
+      input: `bluesky "literal" lang:en "from:invalid"`,
+      output: {query: `bluesky "literal" "from:invalid"`, params: {lang: `en`}},
+    },
+  ]
+
+  it.each(tests)(
+    `$input -> $output.query $output.params`,
+    ({input, output}) => {
+      expect(parseSearchQuery(input)).toEqual(output)
+    },
+  )
+})

src/screens/Search/utils.ts

@@ -0,0 +1,43 @@
+export type Params = Record<string, string>
+
+export function parseSearchQuery(rawQuery: string) {
+  let base = rawQuery
+  const rawLiterals = rawQuery.match(/[^:\w\d]".+?"/gi) || []
+
+  // remove literals from base
+  for (const literal of rawLiterals) {
+    base = base.replace(literal.trim(), '')
+  }
+
+  // find remaining params in base
+  const rawParams = base.match(/[a-z]+:[a-z-\.@\d:"]+/gi) || []
+
+  for (const param of rawParams) {
+    base = base.replace(param, '')
+  }
+
+  base = base.trim()
+
+  const params = rawParams.reduce((params, param) => {
+    const [name, ...value] = param.split(/:/)
+    params[name] = value.join(':').replace(/"/g, '') // dates can contain additional colons
+    return params
+  }, {} as Params)
+  const literals = rawLiterals.map(l => String(l).trim())
+
+  return {
+    query: [base, literals.join(' ')].filter(Boolean).join(' '),
+    params,
+  }
+}
+
+export function makeSearchQuery(query: string, params: Params) {
+  return [
+    query,
+    Object.entries(params)
+      .map(([name, value]) => `${name}:${value}`)
+      .join(' '),
+  ]
+    .filter(Boolean)
+    .join(' ')
+}