main: Provide template variables about the file being imported.

README.rst

@@ -76,6 +76,13 @@ date               The date of the transaction, in your configured output
                    format
 ------------------ ----------------------------------------------------------
 payee              The name of the transaction payee
+------------------ ----------------------------------------------------------
+source_abspath     The absolute path of the file being imported
+------------------ ----------------------------------------------------------
+source_name        The filename of the file being imported
+------------------ ----------------------------------------------------------
+source_path        The path of the file being imported, as specified on the
+                   command line
 ================== ==========================================================
 
 Specific importers and hooks may provide additional variables.

import2ledger/__main__.py

@@ -1,3 +1,4 @@
+import collections
 import contextlib
 import logging
 import sys
@@ -13,7 +14,9 @@ class FileImporter:
         self.hooks = [hook(config) for hook in hooks.load_all()]
         self.stdout = stdout
 
-    def import_file(self, in_file):
+    def import_file(self, in_file, in_path=None):
+        if in_path is None:
+            in_path = pathlib.Path(in_file.name)
         importers = []
         for importer in self.importers:
             in_file.seek(0)
@@ -31,6 +34,11 @@ class FileImporter:
                     importers.append((importer, template))
         if not importers:
             raise errors.UserInputFileError("no importers available", in_file.name)
+        source_vars = {
+            'source_abspath': in_path.absolute().as_posix(),
+            'source_name': in_path.name,
+            'source_path': in_path.as_posix(),
+        }
         with contextlib.ExitStack() as exit_stack:
             output_path = self.config.get_output_path()
             if output_path is None:
@@ -48,7 +56,8 @@ class FileImporter:
                             break
                     else:
                         del entry_data['_hook_cancel']
-                        print(template.render(**entry_data), file=out_file, end='')
+                        render_vars = collections.ChainMap(entry_data, source_vars)
+                        print(template.render(render_vars), file=out_file, end='')
 
     def import_path(self, in_path):
         if in_path is None:
@@ -56,7 +65,7 @@ class FileImporter:
         with in_path.open(errors='replace') as in_file:
             if not in_file.seekable():
                 raise errors.UserInputFileError("only seekable files are supported", in_path)
-            return self.import_file(in_file)
+            return self.import_file(in_file, in_path)
 
     def import_paths(self, path_seq):
         for in_path in path_seq:

tests/data/test_main.ini

@@ -8,5 +8,7 @@ template patreon cardfees =
  Accrued:Accounts Receivable  -{amount}
  Expenses:Fees:Credit Card  {amount}
 template patreon svcfees =
+ ;SourcePath: {source_abspath}
+ ;SourceName: {source_name}
  Accrued:Accounts Receivable  -{amount}
  Expenses:Fundraising  {amount}

tests/data/test_main_fees_import.ledger

@@ -2,14 +2,18 @@
   Accrued:Accounts Receivable  $-52.47
   Expenses:Fees:Credit Card  $52.47
 
-2017/09/01 Patreon
-  Accrued:Accounts Receivable  $-61.73
-  Expenses:Fundraising  $61.73
-
 2017/10/01 Patreon
   Accrued:Accounts Receivable  $-99.47
   Expenses:Fees:Credit Card  $99.47
 
+2017/09/01 Patreon
+  ;SourcePath: {source_abspath}
+  ;SourceName: {source_name}
+  Accrued:Accounts Receivable  $-61.73
+  Expenses:Fundraising  $61.73
+
 2017/10/01 Patreon
+  ;SourcePath: {source_abspath}
+  ;SourceName: {source_name}
   Accrued:Accounts Receivable  $-117.03
   Expenses:Fundraising  $117.03

tests/test_main.py

@@ -30,35 +30,50 @@ def iter_entries(in_file):
     if lines:
         yield ''.join(lines)
 
-def entries2set(in_file):
+def format_entry(entry_s, format_vars):
-    return set(normalize_whitespace(e) for e in iter_entries(in_file))
+    return normalize_whitespace(entry_s).format_map(format_vars)
 
-def expected_entries(path):
+def format_entries(source, format_vars=None):
+    if format_vars is None:
+        format_vars = {}
+    return (format_entry(e, format_vars) for e in iter_entries(source))
+
+def expected_entries(path, format_vars=None):
     path = pathlib.Path(path)
     if not path.is_absolute():
         path = DATA_DIR / path
     with path.open() as in_file:
-        return entries2set(in_file)
+        return list(format_entries(in_file, format_vars))
+
+def path_vars(path):
+    return {
+        'source_abspath': str(path),
+        'source_name': path.name,
+        'source_path': str(path),
+    }
 
 def test_fees_import():
+    source_path = pathlib.Path(DATA_DIR, 'PatreonEarnings.csv')
     arglist = ARGLIST + [
         '-c', 'One',
-        pathlib.Path(DATA_DIR, 'PatreonEarnings.csv').as_posix(),
+        source_path.as_posix(),
     ]
     exitcode, stdout, _ = run_main(arglist)
     assert exitcode == 0
-    actual = entries2set(stdout)
+    actual = list(format_entries(stdout))
-    assert actual == expected_entries('test_main_fees_import.ledger')
+    expected = expected_entries('test_main_fees_import.ledger', path_vars(source_path))
+    assert actual == expected
 
 def test_date_range_import():
+    source_path = pathlib.Path(DATA_DIR, 'PatreonEarnings.csv')
     arglist = ARGLIST + [
         '-c', 'One',
         '--date-range', '2017/10/01-',
-        pathlib.Path(DATA_DIR, 'PatreonEarnings.csv').as_posix(),
+        source_path.as_posix(),
     ]
     exitcode, stdout, _ = run_main(arglist)
     assert exitcode == 0
-    actual = entries2set(stdout)
+    actual = list(format_entries(stdout))
-    expected = {entry for entry in expected_entries('test_main_fees_import.ledger')
+    valid = expected_entries('test_main_fees_import.ledger', path_vars(source_path))
-                if entry.startswith('2017/10/')}
+    expected = [entry for entry in valid if entry.startswith('2017/10/')]
     assert actual == expected