[job] add 'output.jsonl' option (#8953)

docs/configuration.rst

@@ -8035,6 +8035,17 @@ Description
     Include fallback URLs in the output of ``-g/--get-urls``.
 
 
+output.jsonl
+------------
+Type
+    ``bool``
+Default
+    ``false``
+Description
+    Output ``-j/--dump-json`` & ``-J/--resolve-json``
+    data in `JSON Lines <https://jsonlines.org/>`__ format.
+
+
 output.private
 --------------
 Type

docs/gallery-dl.conf

@@ -1276,6 +1276,7 @@
     {
         "ansi"     : true,
         "fallback" : true,
+        "jsonl"    : false,
         "mode"     : "auto",
         "private"  : false,
         "progress" : true,

gallery_dl/job.py

@@ -947,6 +947,7 @@ class DataJob(Job):
         self.data_meta = []
         self.exception = None
         self.ascii = config.get(("output",), "ascii", ensure_ascii)
+        self.jsonl = config.get(("output",), "jsonl", False)
         self.resolve = 128 if resolve is True else (resolve or self.resolve)
 
         private = config.get(("output",), "private")
@@ -954,6 +955,8 @@ class DataJob(Job):
 
         if self.resolve > 0:
             self.handle_queue = self.handle_queue_resolve
+        if not self.jsonl:
+            self.out = util.noop
 
     def run(self):
         self._init()
@@ -983,7 +986,7 @@ class DataJob(Job):
             for msg in self.data:
                 util.transform_dict(msg[-1], util.number_to_string)
 
-        if self.file:
+        if self.file and not self.jsonl:
             # dump to 'file'
             try:
                 util.dump_json(self.data, self.file, self.ascii, 2)
@@ -993,22 +996,30 @@ class DataJob(Job):
 
         return 0
 
+    def out(self, msg):
+        self.file.write(util.json_dumps(msg))
+        self.file.write("\n")
+        self.file.flush()
+
     def handle_url(self, url, kwdict):
         kwdict = self.filter(kwdict)
+        self.out(msg := (Message.Url, url, kwdict))
         self.data_urls.append(url)
         self.data_meta.append(kwdict)
-        self.data.append((Message.Url, url, kwdict))
+        self.data.append(msg)
 
     def handle_directory(self, kwdict):
         kwdict = self.filter(kwdict)
+        self.out(msg := (Message.Directory, kwdict))
         self.data_post.append(kwdict)
-        self.data.append((Message.Directory, kwdict))
+        self.data.append(msg)
 
     def handle_queue(self, url, kwdict):
         kwdict = self.filter(kwdict)
+        self.out(msg := (Message.Queue, url, kwdict))
         self.data_urls.append(url)
         self.data_meta.append(kwdict)
-        self.data.append((Message.Queue, url, kwdict))
+        self.data.append(msg)
 
     def handle_queue_resolve(self, url, kwdict):
         if cls := kwdict.get("_extractor"):
@@ -1018,9 +1029,10 @@ class DataJob(Job):
 
         if not extr:
             kwdict = self.filter(kwdict)
+            self.out(msg := (Message.Queue, url, kwdict))
             self.data_urls.append(url)
             self.data_meta.append(kwdict)
-            return self.data.append((Message.Queue, url, kwdict))
+            return self.data.append(msg)
 
         job = self.__class__(extr, self, None, self.ascii, self.resolve-1)
         job.data = self.data

test/test_job.py

@@ -359,6 +359,25 @@ class TestDataJob(TestJob):
         self.assertEqual(tjob.data[-1][0], Message.Url)
         self.assertEqual(tjob.data[-1][2]["num"], "3")
 
+    def test_jsonl(self):
+        extr = TestExtractor.from_url("test:")
+        tjob = self.jobclass(extr, file=io.StringIO())
+        with patch("gallery_dl.job.DataJob.out") as out:
+            tjob.run()
+        self.assertEqual(len(out.call_args_list), 0)
+
+        config.set(("output",), "jsonl", True)
+        extr = TestExtractor.from_url("test:")
+        file = io.StringIO()
+        tjob = self.jobclass(extr, file=file)
+        with patch("gallery_dl.job.DataJob.out") as out:
+            tjob.run()
+        self.assertEqual(len(out.call_args_list), 4)
+
+        tjob.run()
+        for line in file.getvalue().split():
+            self.assertRegex(line, r"""^\[[23],("http[^"]+",)?\{.+\}\]$""")
+
 
 class TestExtractor(Extractor):
     category = "test_category"