Add function to get highlight start location

packages/api/package.json

@@ -46,6 +46,7 @@
     "cookie-parser": "^1.4.5",
     "cors": "^2.8.5",
     "dataloader": "^2.0.0",
+    "diff-match-patch": "^1.0.5",
     "dompurify": "^2.0.17",
     "dot-case": "^3.0.4",
     "dotenv": "^8.2.0",
@@ -96,6 +97,7 @@
     "@types/chai-string": "^1.4.2",
     "@types/cookie": "^0.4.0",
     "@types/cookie-parser": "^1.4.2",
+    "@types/diff-match-patch": "^1.0.32",
     "@types/dompurify": "^2.0.4",
     "@types/express": "^4.17.7",
     "@types/graphql-fields": "^1.3.4",

packages/api/src/services/highlights.ts

@@ -0,0 +1,7 @@
+import { diff_match_patch } from 'diff-match-patch'
+
+export const getHighlightLocation = (patch: string): number | undefined => {
+  const dmp = new diff_match_patch()
+  const patches = dmp.patch_fromText(patch)
+  return patches[0].start1 || undefined
+}

packages/api/test/services/highlights.test.ts

@@ -0,0 +1,25 @@
+import 'mocha'
+import { expect } from 'chai'
+import { getHighlightLocation } from '../../src/services/highlights'
+
+describe('getHighlightLocation', () => {
+  let patch: string
+  let location: number
+
+  before(async () => {
+    location = 109
+    patch = `@@ -${location + 1},16 +${location + 1},36 @@
+ . We're
++%3Comnivore_highlight%3E
+ humbled
+@@ -254,16 +254,37 @@
+ h in the
++%3C/omnivore_highlight%3E
+  coming`
+  })
+
+  it('returns highlight location from patch', async () => {
+    const result = getHighlightLocation(patch)
+    expect(result).to.eql(location)
+  })
+})

packages/db/migrations/0090.do.integrations.sql

@@ -9,7 +9,7 @@ CREATE TYPE omnivore.integration_type AS ENUM ('READWISE');
 CREATE TABLE omnivore.integrations (
     id uuid PRIMARY KEY DEFAULT uuid_generate_v1mc(),
     user_id uuid NOT NULL REFERENCES omnivore.user ON DELETE CASCADE,
-    "type" integration_type NOT NULL,
+    "type" omnivore.integration_type NOT NULL,
     token varchar(255) NOT NULL,
     "enabled" boolean NOT NULL DEFAULT true,
     created_at timestamptz NOT NULL DEFAULT current_timestamp,