Added rudimentary VSCode launch for development

.vscode/launch.json

@@ -0,0 +1,23 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python: Module",
+            "type": "python",
+            "request": "launch",
+            "module": "renamebycsv.cli",
+            "args": [
+                "${workspaceFolder}/tests/resources/files",
+                "group\\d+-\\w-(\\d+)\\.txt",
+                "${workspaceFolder}/tests/resources/groups.csv",
+                "target",
+                "replaced",
+                "-d"
+            ],
+            "justMyCode": true
+        }
+    ]
+}

renamebycsv/cli.py

@@ -50,10 +50,17 @@ def rename(
                 raise Exception("Duplicate current key.")
             replacement_dict[row[current_col_ind]] = row[become_col_ind]
     for subitem_path, subitem, match in candidates:
+        if match.group(1) not in replacement_dict:
+            logging.warning(
+                'Group "%s" was not matched to any row in the provided CSV. '
+                "Skipping...",
+                match.group(1)
+            )
+            continue
         original = subitem_path
         objective = os.path.join(
             os.path.dirname(subitem_path),
-            re.sub(match.re, replacement_dict[match.group(1)], subitem),
+            re.sub(match.re, replacement_dict[match.group(1)], subitem.strip()),
         )
         if keep_extension:
             objective += os.path.splitext(subitem_path)[1]

tests/resources/files/foo.txt

@@ -0,0 +1 @@
+Text

tests/resources/files/group1-a-12.txt

@@ -0,0 +1,2 @@
+
+Text

tests/resources/files/group1-a-13.txt

@@ -0,0 +1 @@
+Text

tests/resources/files/group1-b-10.txt

@@ -0,0 +1 @@
+Text

tests/resources/files/group1-b-11.txt

@@ -0,0 +1 @@
+Text

tests/resources/files/group1-b-14.txt

@@ -0,0 +1 @@
+Text

tests/resources/files/group1-b-9.txt

@@ -0,0 +1 @@
+Text

tests/resources/groups.csv

@@ -0,0 +1,6 @@
+target,replaced
+9,a
+10,b
+11,c
+12,d
+13,e