Pack: Made project path explicit

blender_asset_tracer/cli/pack.py

@@ -3,6 +3,7 @@ import functools
 import logging
 import pathlib
 import shutil
+import sys
 
 from blender_asset_tracer import tracer
 from . import common
@@ -17,20 +18,23 @@ def add_parser(subparsers):
     parser.set_defaults(func=cli_pack)
     parser.add_argument('blendfile', type=pathlib.Path)
     parser.add_argument('target', type=pathlib.Path)
+    parser.add_argument('-p', '--project', type=pathlib.Path,
+                        help='Root directory of your project. Paths to below this directory are '
+                             'kept in the BAT Pack as well, whereas references to assets from '
+                             'outside this directory will have to be rewitten. The blend file MUST '
+                             'be inside the project directory. If this option is ommitted, the '
+                             'directory containing the blend file is taken as the project '
+                             'directoy.')
+    parser.add_argument('-n', '--noop', default=False, action='store_true',
+                        help="Don't copy files, just show what would be done.")
 
 
 def cli_pack(args):
-    bpath = args.blendfile
-    if not bpath.exists():
-        log.fatal('File %s does not exist', args.bpath)
-        return 3
+    bpath, ppath, tpath = paths_from_cli(args)
+    if args.noop:
+        log.warning('Running in no-op mode, only showing what will be done.')
 
-    tpath = args.target
-    if tpath.exists() and not tpath.is_dir():
-        log.fatal('Target %s exists and is not a directory', tpath)
-        return 4
-
-    shorten = functools.partial(common.shorten, pathlib.Path.cwd())
+    shorten = functools.partial(common.shorten, ppath)
     already_copied = set()
     for usage in tracer.deps(bpath):
         if usage.asset_path.is_absolute():
@@ -54,8 +58,44 @@ def cli_pack(args):
 
             full_target = tpath / relpath
             full_target.parent.mkdir(parents=True, exist_ok=True)
-            # TODO(Sybren): when we target Py 3.6+, remove the str() calls.
+            if args.noop:
+                print('%s → %s' % (assetpath, full_target))
+            else:
                 print(relpath)
+                # TODO(Sybren): when we target Py 3.6+, remove the str() calls.
                 shutil.copyfile(str(assetpath), str(full_target))
 
     log.info('Copied %d files to %s', len(already_copied), tpath)
+
+
+def paths_from_cli(args) -> (pathlib.Path, pathlib.Path, pathlib.Path):
+    """Return paths to blendfile, project, and pack target.
+
+    Calls sys.exit() if anything is wrong.
+    """
+    bpath = args.blendfile
+    if not bpath.exists():
+        log.critical('File %s does not exist', bpath)
+        sys.exit(3)
+
+    tpath = args.target
+    if tpath.exists() and not tpath.is_dir():
+        log.critical('Target %s exists and is not a directory', tpath)
+        sys.exit(4)
+
+    if args.project is None:
+        ppath = bpath.absolute().parent
+        log.warning('No project path given, using %s', ppath)
+    else:
+        ppath = args.project
+
+    if not ppath.exists():
+        log.critical('Project directory %s does not exist', ppath)
+        sys.exit(5)
+    try:
+        bpath.absolute().relative_to(ppath)
+    except ValueError:
+        log.critical('Project directory %s does not contain blend file %s',
+                     args.project, bpath.absolute())
+        sys.exit(5)
+    return bpath, ppath, tpath