Create update_directory_md.yml

.github/workflows/update_directory_md.yml

@@ -0,0 +1,69 @@
+# This GitHub Action updates the DIRECTORY.md file (if needed) when doing a git push
+name: update_directory_md
+on: [push]
+jobs:
+  update_directory_md:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - shell: python  # Legacy Python 2.7.15 :-(
+        run: import sys ; print("Python {}.{}.{}".format(*sys.version_info))
+      - shell: bash -c "$RUNNER_TOOL_CACHE/Python/3.8.0/x64/python {0}"
+        run: import sys ; print("Python {}.{}.{}".format(*sys.version_info))
+      - shell: bash -c "$RUNNER_TOOL_CACHE/Python/3.8.0/x64/python {0}"
+        run: |
+            import os
+            from typing import Iterator
+
+            URL_BASE = "https://github.com/TheAlgorithms/Java/blob/master"
+            g_output = []
+
+
+            def good_filepaths(top_dir: str = ".") -> Iterator[str]:
+                for dirpath, dirnames, filenames in os.walk(top_dir):
+                    dirnames[:] = [d for d in dirnames if d[0] not in "._"]
+                    for filename in filenames:
+                        if os.path.splitext(filename)[1].lower() == ".java":
+                            yield os.path.join(dirpath, filename).lstrip("./")
+
+
+            def md_prefix(i):
+                return f"{i * '  '}*" if i else "\n##"
+
+
+            def print_path(old_path: str, new_path: str) -> str:
+                global g_output
+                old_parts = old_path.split(os.sep)
+                for i, new_part in enumerate(new_path.split(os.sep)):
+                    if i + 1 > len(old_parts) or old_parts[i] != new_part:
+                        if new_part:
+                            g_output.append(f"{md_prefix(i)} {new_part.replace('_', ' ')}")
+                return new_path
+
+
+            def build_directory_md(top_dir: str = ".") -> str:
+                global g_output
+                old_path = ""
+                for filepath in sorted(good_filepaths(), key=str.lower):
+                    filepath, filename = os.path.split(filepath)
+                    if filepath != old_path:
+                        old_path = print_path(old_path, filepath)
+                    indent = (filepath.count(os.sep) + 1) if filepath else 0
+                    url = "/".join((URL_BASE, filepath, filename)).replace(" ", "%20")
+                    filename = os.path.splitext(filename.replace("_", " "))[0]
+                    g_output.append(f"{md_prefix(indent)} [{filename}]({url})")
+                return "\n".join(g_output)
+
+
+            with open("DIRECTORY.md", "w") as out_file:
+                out_file.write(build_directory_md(".") + "\n")
+
+      - name: Update DIRECTORY.md
+        run: |
+          cat DIRECTORY.md
+          git config --global user.name github-actions
+          git config --global user.email '${GITHUB_ACTOR}@users.noreply.github.com'
+          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
+          git add DIRECTORY.md
+          git commit -am "updating DIRECTORY.md" ||  true
+          git push --force origin HEAD:$GITHUB_REF || true