add progress to download_file if in Indicator context (#5451)

Co-authored-by: Arun Babu Neelicattu <arun.neelicattu@gmail.com>
Co-authored-by: Bjorn Neergaard <bjorn@neersighted.com>

src/poetry/puzzle/provider.py

@@ -13,6 +13,7 @@
 from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import Callable
 from typing import Iterable
 from typing import Iterator
 from typing import cast
@@ -55,6 +56,24 @@
 
 
 class Indicator(ProgressIndicator):  # type: ignore[misc]
+    CONTEXT: str | None = None
+
+    @staticmethod
+    @contextmanager
+    def context() -> Iterator[Callable[[str | None], None]]:
+        def _set_context(context: str | None) -> None:
+            Indicator.CONTEXT = context
+
+        yield _set_context
+
+        _set_context(None)
+
+    def _formatter_context(self) -> str:
+        if Indicator.CONTEXT is None:
+            return " "
+        else:
+            return f" <c1>{Indicator.CONTEXT}</> "
+
     def _formatter_elapsed(self) -> str:
         elapsed = time.time() - self._start_time
 
@@ -796,7 +815,9 @@ def progress(self) -> Iterator[None]:
             self._io.write_line("Resolving dependencies...")
             yield
         else:
-            indicator = Indicator(self._io, "{message} <debug>({elapsed:2s})</debug>")
+            indicator = Indicator(
+                self._io, "{message}{context}<debug>({elapsed:2s})</debug>"
+            )
 
             with indicator.auto(
                 "<info>Resolving dependencies...</info>",

src/poetry/utils/helpers.py

@@ -89,15 +89,41 @@ def download_file(
 ) -> None:
     import requests
 
+    from poetry.puzzle.provider import Indicator
+
     get = requests.get if not session else session.get
 
     response = get(url, stream=True)
     response.raise_for_status()
 
-    with open(dest, "wb") as f:
-        for chunk in response.iter_content(chunk_size=chunk_size):
-            if chunk:
-                f.write(chunk)
+    set_indicator = False
+    with Indicator.context() as update_context:
+        update_context(f"Downloading {url}")
+
+        if "Content-Length" in response.headers:
+            try:
+                total_size = int(response.headers["Content-Length"])
+            except ValueError:
+                total_size = 0
+
+            fetched_size = 0
+            last_percent = 0
+
+            # if less than 1MB, we simply show that we're downloading
+            # but skip the updating
+            set_indicator = total_size > 1024 * 1024
+
+        with open(dest, "wb") as f:
+            for chunk in response.iter_content(chunk_size=chunk_size):
+                if chunk:
+                    f.write(chunk)
+
+                    if set_indicator:
+                        fetched_size += len(chunk)
+                        percent = (fetched_size * 100) // total_size
+                        if percent > last_percent:
+                            last_percent = percent
+                            update_context(f"Downloading {url} {percent:3}%")
 
 
 def get_package_version_display_string(