From a95fb05a5d93c8913d120117ded55e872756ca4f Mon Sep 17 00:00:00 2001
From: konstantinos <boromir674@hotmail.com>
Date: Thu, 16 Nov 2023 00:13:18 +0200
Subject: [PATCH] fix docs ci

---
 scripts/visualize-dockerfile.py | 130 +++++++++++++++++++++++++++++++-
 1 file changed, 129 insertions(+), 1 deletion(-)
 mode change 120000 => 100644 scripts/visualize-dockerfile.py

diff --git a/scripts/visualize-dockerfile.py b/scripts/visualize-dockerfile.py
deleted file mode 120000
index b0dcf6e..0000000
--- a/scripts/visualize-dockerfile.py
+++ /dev/null
@@ -1 +0,0 @@
-/data/repos/static-site-generator/scripts/visualize-dockerfile.py
\ No newline at end of file
diff --git a/scripts/visualize-dockerfile.py b/scripts/visualize-dockerfile.py
new file mode 100644
index 0000000..5390d11
--- /dev/null
+++ b/scripts/visualize-dockerfile.py
@@ -0,0 +1,129 @@
+#!/usr/bin/env python
+import argparse
+import re
+import typing as t
+from pathlib import Path
+
+
+def parse_dockerfile(dockerfile_path):
+    # Stages built from 'FROM <a> AS <b> statements
+    stages = {}
+    # copies built from 'COPY --from=<a> <source_path> <target_path>' statements
+    copies = {}
+    # Line match at current line
+    current_stage = None
+    stage_name_reg = r'[\w:\.\-]+'
+    stage_reg = re.compile(
+        rf'^FROM\s+(?P<stage>{stage_name_reg})\s+[Aa][Ss]\s+(?P<alias>{stage_name_reg})'
+    )
+
+    copy_from_reg = re.compile(
+        r'^COPY\s+\-\-from=(?P<prev_stage>[\w\.\-:]+)\s+(?P<path>[\w\.\-:/]+)'
+    )
+
+    with open(dockerfile_path, 'r') as f:
+        lines = f.readlines()
+
+        for line in lines:
+            line = line.strip()
+
+            # Check if it's a new stage
+            # each stage has a unique alias in the Dockerfile
+            stage_match = stage_reg.match(line)
+            if stage_match:  # FROM <a> AS <b>
+                current_stage = stage_match.group('alias')
+
+                # we create an empty list for pointing to "prev" stages
+                stages[current_stage] = []
+                copies[current_stage] = []
+                try:
+                    previous_stage = stage_match.group('stage')
+                except AttributeError as error:
+                    print(f'[DEBUG] Line: {line}')
+                    print(f"Error: {error}")
+                    raise error
+                # Add instructions to current stage
+                if current_stage:
+                    stages[current_stage].append(previous_stage)
+            else:
+                match = copy_from_reg.match(line)
+                if match:  # COPY --from=<a> <source_path> <target_path>
+                    previous_stage: str = match.group('prev_stage')
+                    path_copied: str = match.group('path')
+                    copies[current_stage].append((previous_stage, path_copied))
+
+    return stages, copies
+
+
+def generate_mermaid_flow_chart(dockerfile_dag):
+    stages: t.Dict[str, t.List[str]] = dockerfile_dag[0]
+    thick_line_with_arrow = '-->'
+    copies: t.Dick[str, t.List[t.Tuple[str, str]]] = dockerfile_dag[1]
+    dotted_arrow_with_text = '-. "{text}" .->'
+
+    chart = "graph TB;\n"
+
+    for stage, prev_stages in stages.items():
+        # chart += f"  {stage}({stage})\n"
+
+        # Connect 'FROM <a> AS <b>' Stages
+        for prev_stage in prev_stages:
+            chart += f"  {prev_stage} {thick_line_with_arrow} {stage}\n"
+
+        # Connect 'COPY --from<a> <path> <dest>' statements
+        prev_copies = copies.get(stage, [])
+        for prev_copy in prev_copies:
+            prev_stage: str = prev_copy[0]
+            # write copied path in arrow text
+            # path_copied: str = prev_copy[1]
+            # chart += f"  {prev_stage} " + dotted_arrow_with_text.format(text=path_copied) + f" {stage}\n"
+            # write COPY (literal) in arrow text
+            chart += (
+                f"  {prev_stage} " + dotted_arrow_with_text.format(text='COPY') + f" {stage}\n"
+            )
+
+    return chart
+
+
+def generate_markdown(dockerfile_path, output_path):
+    dockerfile_dag = parse_dockerfile(dockerfile_path)
+
+    flow_chart = generate_mermaid_flow_chart(dockerfile_dag)
+
+    markdown = (
+        "## Dockerfile Flow Chart\n\n"
+        f"**Dockerfile: {dockerfile_path}**\n\n"
+        f"```mermaid\n{flow_chart}```\n"
+    )
+    if output_path is None:
+        print(markdown)
+        return
+    with open(output_path, 'w') as f:
+        f.write(markdown)
+
+    print(f"Markdown generated and saved to {output_path}")
+
+
+def parse_cli_args() -> t.Tuple[Path, t.Optional[str]]:
+    parser = argparse.ArgumentParser(description='Process Dockerfile paths.')
+
+    parser.add_argument(
+        'dockerfile_path', nargs='?', default='Dockerfile', help='Path to the Dockerfile'
+    )
+    parser.add_argument(
+        '-o', '--output', help='Output path. If not specified, print to stdout.'
+    )
+
+    args = parser.parse_args()
+
+    dockerfile: Path = Path(args.dockerfile_path)
+    if not dockerfile.exists():
+        # explicitly use cwd to try again to find it
+        dockerfile = Path.cwd() / args.dockerfile_path
+
+    return dockerfile, args.output
+
+
+if __name__ == '__main__':
+    dockerfile_path, output_path = parse_cli_args()
+    generate_markdown(dockerfile_path, output_path)