From 736f2e9a298220f66c1f8ce2e17440f456035814 Mon Sep 17 00:00:00 2001
From: AkiraFukushima <h3.poteto@gmail.com>
Date: Sat, 4 Aug 2018 12:09:01 +0900
Subject: [PATCH] refs #352 Add function to take account name from text

---
 src/renderer/utils/suggestText.js | 27 +++++++++++++++++++
 test/mocha/suggestText.spec.js    | 45 +++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 src/renderer/utils/suggestText.js
 create mode 100644 test/mocha/suggestText.spec.js

diff --git a/src/renderer/utils/suggestText.js b/src/renderer/utils/suggestText.js
new file mode 100644
index 00000000..2f7dd800
--- /dev/null
+++ b/src/renderer/utils/suggestText.js
@@ -0,0 +1,27 @@
+// https://github.com/tootsuite/mastodon/blob/master/app/javascript/mastodon/components/autosuggest_textarea.js
+const textAtCursorMatch = (str, cursorPosition, separator = '@') => {
+  let word
+
+  let left = str.slice(0, cursorPosition).search(/\S+$/)
+  let right = str.slice(cursorPosition).search(/\s/)
+
+  if (right < 0) {
+    word = str.slice(left)
+  } else {
+    word = str.slice(left, right + cursorPosition)
+  }
+
+  if (!word || word.trim().length < 3 || [separator].indexOf(word[0]) === -1) {
+    return [null, null]
+  }
+
+  word = word.trim().toLowerCase()
+
+  if (word.length > 0) {
+    return [left + 1, word]
+  } else {
+    return [null, null]
+  }
+}
+
+export default textAtCursorMatch
diff --git a/test/mocha/suggestText.spec.js b/test/mocha/suggestText.spec.js
new file mode 100644
index 00000000..722ef5fe
--- /dev/null
+++ b/test/mocha/suggestText.spec.js
@@ -0,0 +1,45 @@
+import assert from 'assert'
+import suggestText from '../../src/renderer/utils/suggestText'
+
+describe('account', () => {
+  context('Only account name', () => {
+    const str = '@h3pote'
+    it('should match', () => {
+      const [start, word] = suggestText(str, 7)
+      assert.strictEqual(str, word)
+      assert.strictEqual(start, 1)
+    })
+  })
+  context('Beginning of the sentence', () => {
+    const str = '@h3pote toot body'
+    it('should match', () => {
+      const [start, word] = suggestText(str, 7)
+      assert.strictEqual(word, '@h3pote')
+      assert.strictEqual(start, 1)
+    })
+  })
+  context('Halfway of the sentence', () => {
+    const str = 'toot body @h3pote toot'
+    it('should match', () => {
+      const [start, word] = suggestText(str, 17)
+      assert.strictEqual(word, '@h3pote')
+      assert.strictEqual(start, 11)
+    })
+  })
+  context('End of the sentence', () => {
+    const str = 'toot body @h3pote'
+    it('should match', () => {
+      const [start, word] = suggestText(str, 17)
+      assert.strictEqual(word, '@h3pote')
+      assert.strictEqual(start, 11)
+    })
+  })
+  context('No space', () => {
+    const str = 'tootbody@h3pote'
+    it('should not match', () => {
+      const [start, word] = suggestText(str, 15)
+      assert.strictEqual(word, null)
+      assert.strictEqual(start, null)
+    })
+  })
+})