From 6927fdcf07f877032fee7670e7ace4943a330027 Mon Sep 17 00:00:00 2001
From: nicoo <nicoo@mur.at>
Date: Wed, 6 Jan 2021 13:08:30 +0100
Subject: [PATCH] Add a `dependencies` command, which dumps the list of
 dependencies

This is useful for automating things like installing only a project's
dependencies, in CI.
---
 bork/api.py | 6 ++++++
 bork/cli.py | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/bork/api.py b/bork/api.py
index 2a28da1..914daaf 100644
--- a/bork/api.py
+++ b/bork/api.py
@@ -4,6 +4,7 @@
 import subprocess
 import sys
 
+import pep517  # type:ignore
 import toml
 
 from . import builder
@@ -40,6 +41,11 @@ def clean():
             try_delete(name)
 
 
+def dependencies():
+    """Get the list of dependencies."""
+    return pep517.meta.load('.').metadata.get_all('Requires-Dist')
+
+
 def download(package, release_tag, file_pattern, directory):
     if file_pattern is None or len(file_pattern) == 0:
         raise ValueError('file_pattern must be non-empty.')
diff --git a/bork/cli.py b/bork/cli.py
index 3b18313..c6c6698 100644
--- a/bork/cli.py
+++ b/bork/cli.py
@@ -40,6 +40,14 @@ def clean():
     api.clean()
 
 
+@cli.command()
+@click.option('-o', '--output', type=click.File('w'), default='-',
+              help='File in which to save the list of dependencies.')
+def dependencies(output):
+    for dep in api.dependencies():
+        print(dep, file=output)
+
+
 @cli.command()
 @click.option('--files', default='*.pyz',
               help='Comma-separated list of filenames to download. Supports '