Keep the 0.9.39 cdxt command lines working (deprecated)

CHANGELOG.md

@@ -1,7 +1,10 @@
 - unreleased
 	+ new command line interface: `cdxt index` and `cdxt repackage` (see README)
-	+ `cdxt iter` is a deprecated alias of `cdxt index` (same arguments, prints a deprecation warning)
-	+ removed `cdxt size` and `cdxt warc`; they print the equivalent new command
+	+ the command lines of 0.9.39 (`cdxt --cc iter URL`, `size`, `warc`) are deprecated (to be removed in a future version): they run
+	  with the new code and print a suggested new command line; `iter` output, `--get` and `size --details` are kept;
+	  `warc` writes `TEST-001.warc.gz` (was `TEST-000000.extracted.warc.gz`) with the records copied byte-for-byte
+	  (no `WARC-Source-URI`/`WARC-Source-Range` headers), no file without captures, and exits with status 1 if
+	  captures could not be fetched; `iter --all-fields --csv` is a usage error (was a traceback)
 	+ `cdxt index`: `--hostname`, `--domain`, repeatable `--url`, `-o/--output` (local or remote),
 	  JSONL/CDXJ/CSV/TSV output, all fields by default, `--count` replaces `size`
 	+ `cdxt repackage`: reads captures from a file or stdin, human-readable `--size`, `--is-part-of`, `--description`

README.md

@@ -317,10 +317,12 @@ upload (an S3 lifecycle rule for incomplete uploads removes it).
 
 ### Migrating from the old commands
 
-`cdxt iter` is a deprecated alias of `cdxt index` with the same (new)
-arguments; it prints a deprecation warning. The `size` and `warc` commands
-have been removed; running them prints the equivalent new command. See the [migration guide](docs/cli-migration-guide.md)
-for all changes and more examples.
+The command lines of cdx_toolkit 0.9.39 (`cdxt --cc iter ...`, `size`,
+`warc`) still work, but are deprecated and will be removed in a future
+version; they print a suggested new command line. The old `warc` now writes
+`TEST-001.warc.gz` and exits with status 1 if captures could not be fetched.
+See the [migration guide](docs/cli-migration-guide.md) for all changes and
+more examples.
 
 | Old | New |
 |---|---|

cdx_toolkit/cli/__init__.py

@@ -8,8 +8,7 @@
 
 from . import index, repackage
 from .common import IncompleteError, add_verbose_arg, set_loglevel
-from .deprecated import DEPRECATED_COMMANDS, REMOVED_COMMANDS, exit_removed_command, get_command
-from .deprecated import rewrite_deprecated_command
+from .legacy import build_legacy_parser, deprecation_message, is_legacy_command_line
 
 
 def build_parser() -> ArgumentParser:
@@ -28,15 +27,13 @@ def main(args=None):
     if args is None:  # pragma: no cover
         args = sys.argv[1:]
 
-    command = get_command(args)
-    if command in REMOVED_COMMANDS:
-        exit_removed_command(command, args)
-    if command in DEPRECATED_COMMANDS:
-        args = rewrite_deprecated_command(args)
-
-    parser = build_parser()
+    # the command lines of cdx_toolkit 0.9.39 (deprecated): `cdxt --cc iter URL`, `size`, `warc`
+    legacy = is_legacy_command_line(args)
+    parser = build_legacy_parser() if legacy else build_parser()
     cmd = parser.parse_args(args=args)
     set_loglevel(cmd.verbose)
+    if legacy:
+        sys.stderr.write(deprecation_message(cmd))
     configure_fsspec_s3()  # Common Crawl's S3 defaults for s3:// paths, unless configured by the user
     cmdline = ' '.join(['cdxt'] + list(args))
     if uses_hf(args):