allows specifying dump files individually

fixes #112

Author: philipmat

README.md

@@ -62,23 +62,41 @@ $ sha256sum -c discogs_*_CHECKSUM.txt
 
 Run `run.py` to convert the dump files to csv.
 
+There are two run modes:
+
+1. You can point it to a directory where the discogs dump files are
+   and use one or multiple `--export` options to indicate which files to process:
+
 ```sh
 # ensure the virtual environment is active
 (.discogsenv) $ python3 run.py \
   --bz2 \ # compresses resulting csv files
   --apicounts \ # provides more accurate progress counts
   --export artist --export label --export master --export release \
+  --output csv-dir    # folder where to output the csv files
   dump-dir \ # folder where the data dumps are
-  csv-dir    # folder where to output the csv files
+```
+
+2. You can specify the individual files instead:
+
+```sh
+# ensure the virtual environment is active
+(.discogsenv) $ python3 run.py \
+  --bz2 \ # compresses resulting csv files
+  --apicounts \ # provides more accurate progress counts
+  --output csv-dir    # folder where to output the csv files
+  path/to/discogs_20200806_artist.xml.gz path/to/discogs_20200806_labels.xml.gz
 ```
 
 `run.py` takes the following arguments:
 
 - `--export`: the types of dump files to export: "artist", "label", "master", "release.  
   It matches the names of the dump files, e.g. "discogs_20200806_*artist*s.xml.gz"
+  Not needed if the individual files are specified.
 - `--bz2`: Compresses output csv files using bz2 compression library.
 - `--limit=<lines>`: Limits export to some number of entities
 - `--apicounts`: Makes progress report more accurate by getting total amounts from Discogs API.
+- `--output` : the folder where to store the csv files; default it current directory
 
 The exporter provides progress information in real time:
 

discogsxml2db/exporter.py

@@ -37,16 +37,19 @@ def _write_rows(writer, entity, name):
 class EntityCsvExporter(object):
     """Read a Discogs dump XML file and exports SQL table records as CSV.
     """
-    def __init__(self, entity, in_dir, out_dir,
+    def __init__(self, entity, in_file_or_dir, out_dir,
                  limit=None, bz2=True,
                  dry_run=False, debug=False, max_hint=None, verbose=False):
         self.entity = entity
         self.parser = _parsers[entity]()
         self.max_hint = max_hint
         self.verbose = verbose
 
-        lookup = 'discogs_[0-9]*_{}s.xml*'.format(entity)
-        self.pattern = os.path.join(in_dir, lookup)
+        if os.path.isfile(in_file_or_dir):
+            self.pattern = in_file_or_dir
+        else:
+            lookup = 'discogs_[0-9]*_{}s.xml*'.format(entity)
+            self.pattern = os.path.join(in_file_or_dir, lookup)
 
         # where and how the exporter will write to
         self.out_dir = out_dir
@@ -287,8 +290,7 @@ def write_track_artists(self, writer, release):
 
 
 def main(arguments):
-    in_base = arguments['INPUT']
-    out_base = arguments['OUTPUT'] or '.'
+    out_base = arguments['--output'] or '.'
     limit = int(arguments['--limit']) if arguments['--limit'] else None
     bz2_on = arguments['--bz2']
     debug = arguments['--debug']
@@ -312,14 +314,33 @@ def main(arguments):
         except Exception:
             pass
 
-    for entity in arguments['--export']:
-        expected_count = rough_counts['{}s'.format(entity)]
-        exporter = _exporters[entity](
-            in_base,
-            out_base,
-            limit=limit,
-            bz2=bz2_on,
-            debug=debug,
-            max_hint=min(expected_count, limit or expected_count),
-            dry_run=dry_run)
-        exporter.export()
+    if arguments['INPUT_DIR']:
+        # use --export to select the entities
+        in_base = arguments['INPUT_DIR']
+        for entity in arguments['--export']:
+            expected_count = rough_counts['{}s'.format(entity)]
+            exporter = _exporters[entity](
+                in_base,
+                out_base,
+                limit=limit,
+                bz2=bz2_on,
+                debug=debug,
+                max_hint=min(expected_count, limit or expected_count),
+                dry_run=dry_run)
+            exporter.export()
+    elif arguments["<INPUT_FILE>"]:
+        for in_file in arguments["<INPUT_FILE>"]:
+            for entity in _exporters:
+                # discogs files are named discogs_{date}_{entity}s.xml
+                if f"_{entity}" in in_file:
+                    expected_count = rough_counts['{}s'.format(entity)]
+                    exporter = _exporters[entity](
+                        in_file,
+                        out_base,
+                        limit=limit,
+                        bz2=bz2_on,
+                        debug=debug,
+                        max_hint=min(expected_count, limit or expected_count),
+                        dry_run=dry_run)
+                    exporter.export()
+                    break

run.py

@@ -1,15 +1,17 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 """Usage:
-  run.py [--bz2] [--dry-run] [--limit=<lines>] [--debug] [--apicounts] INPUT [OUTPUT] [--export=<entity>]...
+  run.py [--bz2] [--dry-run] [--limit=<lines>] [--debug] [--apicounts] [--output=<output>] INPUT_DIR [--export=<entity>]...
+  run.py [--bz2] [--dry-run] [--limit=<lines>] [--debug] [--apicounts] [--output=<output>] <INPUT_FILE> <INPUT_FILE>...
 
 Options:
   --bz2                 Compress output files using bz2 compression library.
   --limit=<lines>       Limit export to some number of entities
-  --export=<entity>     Limit export to some entities (repeatable)
+  --export=<entity>     Limit export to some entities (repeatable).
+                        Entity is one of: artist, label, master, release.
   --debug               Turn on debugging prints
   --apicounts           Check entities counts with Discogs API
-  --dry-run             Do not write
+  --dry-run             Do not write csv files.
 
 """
 import sys
@@ -20,4 +22,6 @@
 
 if __name__ == '__main__':
     arguments = docopt(__doc__, version='Discogs-to-SQL exporter')
+    if arguments["--debug"]:
+        print(arguments)
     sys.exit(main(arguments))