docs: add support for badge shortcodes in documentation

This will allow us to add little icons to various parts of the docs to denote when something is for a particular scheduler only.

docs/_build/hooks.py

@@ -0,0 +1,125 @@
+#!/usr/bin/env python
+
+import posixpath
+import re
+
+from re import Match
+from mkdocs.config.defaults import MkDocsConfig
+from mkdocs.structure.files import File, Files
+from mkdocs.structure.pages import Page
+
+
+def on_page_markdown(markdown: str, *, page: Page, config: MkDocsConfig, files: Files):
+    """
+    This hook is called after the page's markdown is loaded from file and can be
+    """
+
+    def replace(match: Match):
+        badge_type, args = match.groups()
+        args = args.strip()
+        if badge_type == "version":
+            return _badge_for_version(args, page, files)
+        if badge_type == "scheduler":
+            return _badge_for_scheduler(args, page, files)
+        if type == "flag":
+            return flag(args, page, files)
+
+        # Otherwise, raise an error
+        raise RuntimeError(f"Unknown shortcode: {badge_type}")
+
+    return re.sub(r"<!-- md:(\w+)(.*?) -->", replace, markdown, flags=re.I | re.M)
+
+
+def _badge(icon: str, text: str = "", badge_type: str = ""):
+    """
+    Create badge
+    """
+    classes = f"mdx-badge mdx-badge--{badge_type}" if badge_type else "mdx-badge"
+    text = f"{text}{{ data-preview='' }}" if text.endswith(")") else text
+    return "".join(
+        [
+            f'<span class="{classes}">',
+            *([f'<span class="mdx-badge__icon">{icon}</span>'] if icon else []),
+            *([f'<span class="mdx-badge__text">{text}</span>'] if text else []),
+            "</span>",
+        ]
+    )
+
+
+def _badge_for_scheduler(text: str, page: Page, files: Files):
+    """
+    Create badge for scheduler
+    """
+
+    # Return badge
+    icon = "simple-docker"
+    if text in ["kubernetes", "k3s"]:
+        icon = "simple-kubernetes"
+        text = "k3s"
+    elif text == "nomad":
+        icon = "simple-nomad"
+    elif text in ["docker", "docker-local"]:
+        icon = "simple-docker"
+        text = "docker-local"
+
+    href = f"https://dokku.com/docs/deployment/schedulers/{text}/"
+    return _badge(
+        icon=f"[:{icon}:]({href} '{text}')",
+        text=f"[{text}]({href})",
+    )
+
+
+def _badge_for_version(text: str, page: Page, files: Files):
+    """
+    Create badge for version
+    """
+
+    # Return badge
+    icon = "material-tag-outline"
+    href = f"https://github.com/dokku/dokku/releases/tag/v{text}"
+    return _badge(
+        icon=f"[:{icon}:]({href} 'Since {text}')",
+        text=f"[{text}]({href})",
+    )
+
+
+def flag(args: str, page: Page, files: Files):
+    """
+    Create flag
+    """
+
+    flag_type, *_ = args.split(" ", 1)
+    if flag_type == "experimental":
+        return _badge_for_experimental(page, files)
+    raise RuntimeError(f"Unknown flag type: {flag_type}")
+
+
+def _badge_for_experimental(page: Page, files: Files):
+    """
+    Create badge for experimental
+    """
+
+    icon = "material-flask-outline"
+    href = _resolve_path("conventions.md#experimental", page, files)
+    return _badge(icon=f"[:{icon}:]({href} 'Experimental')")
+
+
+def _resolve_path(path: str, page: Page, files: Files):
+    """
+    Resolve path of file relative to given page - the posixpath always includes
+    one additional level of `..` which we need to remove
+    """
+
+    path, anchor, *_ = f"{path}#".split("#")
+    path = _resolve(files.get_file_from_path(path), page)
+    return "#".join([path, anchor]) if anchor else path
+
+
+def _resolve(file: File, page: Page):
+    """
+    Resolve path of file relative to given page - the posixpath always includes
+    one additional level of `..` which we need to remove
+    """
+
+    path = posixpath.relpath(file.src_uri, page.file.src_uri)
+    return posixpath.sep.join(path.split(posixpath.sep)[1:])

docs/assets/extra.css

@@ -3,3 +3,21 @@
   --md-primary-fg-color--light: #ECB7B7;
   --md-primary-fg-color--dark:  #90030C;
 }
+
+.md-typeset .mdx-badge {
+  font-size: .80em;
+}
+
+.md-typeset .mdx-badge__icon {
+  background: var(--md-accent-fg-color--transparent);
+  padding: 0.2rem;
+  border-top-left-radius: 0.1rem;
+  border-bottom-left-radius: 0.1rem
+}
+
+.md-typeset .mdx-badge__text {
+  box-shadow: 0 0 0 1px inset var(--md-accent-fg-color--transparent);
+  padding: 0.2rem 0.3rem;
+  border-bottom-right-radius: 0.1rem;
+  border-top-right-radius: 0.1rem;
+}