1 files changed, 86 insertions, 0 deletions
diff --git a/import_series.py b/import_series.py
new file mode 100644
index 0000000..800f0c9
--- /dev/null
+++ b/import_series.py
@@ -0,0 +1,86 @@
+import patchstate as ps
+import io, os, sys
+
+def lcs(a, b, *, key):
+    a = [*a]
+    b = [*b]
+    if not a or not b:
+        return []
+
+    kas = [*map(key, a)]
+
+    m = [(0,)]
+    for v in a:
+        m.append((m[-1][0] + 1, v, None, m[-1]))
+    for v in b:
+        kb = key(v)
+
+        mi = iter(m)
+        mv = next(mi)
+        m2 = [(mv[0] + 1, None, v, mv)]
+        for ia,mv in enumerate(mi):
+            if kas[ia] == kb:
+                mv = m[ia]
+                m2.append((mv[0], a[ia], v, mv))
+                continue
+            mv1 = m2[-1]
+            if mv[0] <= mv1[0]:
+                m2.append((mv[0] + 1, None, v, mv))
+            else:
+                m2.append((mv1[0] + 1, a[ia], None, mv1))
+            del mv1
+            del ia
+        del mi, mv
+        m = m2
+
+    m = m[-1]
+    del v, a, b, kas
+    m2 = []
+    while len(m) == 4:
+        _,a,b,m = m
+        m2.append((a,b))
+    assert m == (0,)
+    m2.reverse()
+    return m2
+
+def main(args):
+    args = iter(args)
+    arg0 = next(args)
+
+    @ps.argparse_all(args)
+    def path(arg):
+        raise RuntimeError(f'Invalid argument: {arg!r}')
+
+    [repo_path, import_path] = path
+
+    repo = ps.Repository(repo_path)
+
+    pnew = repo.import_dir(import_path)
+
+    with io.open(os.path.join(repo.path, 'series'), 'r') as f:
+        pcur = ps.Series.parse(f.read())
+
+    r = []
+    for p1,p2 in lcs(pcur.info, pnew.info, key=lambda p: p.patch_id):
+        if p1 is None:
+            r.append(p2)
+            continue
+
+        if p2 is None:
+            r.append(p1.update(new_mode='gone'))
+            continue
+
+        r.append(p2.update(mode=p1.mode, info=p1.info))
+
+    pnew.info = r
+
+    pnew_data = pnew.fmt()
+    with io.open(os.path.join(repo.path, 'series'), 'w') as f:
+        f.write(pnew_data)
+
+    repo.gc({p.patch_hash for p in pnew.info})
+
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))