From 3531f1e5330a9be9df63422d324353290958570e Mon Sep 17 00:00:00 2001
From: Romain <asyncadventures@gmail.com>
Date: Fri, 31 Mar 2017 23:20:02 +1100
Subject: [PATCH] Try to infer dates from the filename if there is no "date"
 metadata

---
 src/model/media.js       | 15 +++++++++++++--
 test/model/media.spec.js | 30 +++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/src/model/media.js b/src/model/media.js
index 0e29daf..f7e3fdd 100644
--- a/src/model/media.js
+++ b/src/model/media.js
@@ -3,6 +3,13 @@ const moment = require('moment')
 const path = require('path')
 
 const EXIF_DATE_FORMAT = 'YYYY:MM:DD HH:mm:ssZ'
+
+// infer dates from files with a date-looking filename
+const FILENAME_DATE_REGEX = /\d{4}[_\-.\s]?(\d{2}[_\-.\s]?){5}\..{3,4}/
+
+// moment ignores non-numeric characters when parsing
+const FILENAME_DATE_FORMAT = 'YYYYMMDD HHmmss'
+
 var index = 0
 
 /*
@@ -13,7 +20,7 @@ function Media (file) {
   this.file = file
   this.filename = path.basename(file.path)
   this.urls = _.mapValues(file.output, o => o.path)
-  this.date = exifDate(file)
+  this.date = getDate(file)
   this.caption = caption(file)
   this.isVideo = (file.type === 'video')
   this.isAnimated = animated(file)
@@ -26,13 +33,17 @@ function Media (file) {
   // ]
 }
 
-function exifDate (file) {
+function getDate (file) {
   const date = tagValue(file, 'EXIF', 'DateTimeOriginal') ||
                tagValue(file, 'H264', 'DateTimeOriginal') ||
                tagValue(file, 'QuickTime', 'CreationDate')
   if (date) {
     return moment(date, EXIF_DATE_FORMAT).valueOf()
   } else {
+    if (FILENAME_DATE_REGEX.test(file.path)) {
+      const namedate = moment(file.path, FILENAME_DATE_FORMAT)
+      if (namedate.isValid()) return namedate.valueOf()
+    }
     return file.date
   }
 }
diff --git a/test/model/media.spec.js b/test/model/media.spec.js
index 9dd08e5..1ac852d 100644
--- a/test/model/media.spec.js
+++ b/test/model/media.spec.js
@@ -27,7 +27,35 @@ describe('Media', function () {
       should(media.date).eql(fixtures.date('2016-10-28 17:34:58').getTime())
     })
 
-    it('defaults to the file date if there is no date in the metadata', function () {
+    it('infers the date from the filename (Android format)', function () {
+      const file = fixtures.file({path: 'folder/VID_20170220_114006.mp4'})
+      const media = new Media(file)
+      should(media.date).eql(fixtures.date('2017-02-20 11:40:06').getTime())
+    })
+
+    it('infers the date from the filename (Dropbox format)', function () {
+      const file = fixtures.file({path: 'folder/2017-03-24 19.42.30.jpg'})
+      const media = new Media(file)
+      should(media.date).eql(fixtures.date('2017-03-24 19:42:30').getTime())
+    })
+
+    it('only infers dates from valid formats', function () {
+      const file = fixtures.file({
+        path: 'folder/IMG_1234.jpg',
+        date: '2016-10-28 17:34:58'
+      })
+      const media = new Media(file)
+      should(media.date).eql(fixtures.date('2016-10-28 17:34:58').getTime())
+    })
+
+    it('does not look at the file name if it already has EXIF data', function () {
+      const file = fixtures.file({path: '2017-03-24 19.42.30.jpg'})
+      file.meta.EXIF.DateTimeOriginal = '2016:10:28 17:34:58'
+      const media = new Media(file)
+      should(media.date).eql(fixtures.date('2016-10-28 17:34:58').getTime())
+    })
+
+    it('defaults to the file date if there is no other date', function () {
       const file = fixtures.file({date: '2016-10-28 17:34:58'})
       const media = new Media(file)
       should(media.date).eql(fixtures.date('2016-10-28 17:34:58').getTime())