1 files changed, 135 insertions, 0 deletions
diff --git a/tools/check-version-history.py b/tools/check-version-history.py
new file mode 100644
index 0000000..c4d4b3e
--- /dev/null
+++ b/tools/check-version-history.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+import os
+import sys
+import lxml.etree as tree
+
+_parser = tree.XMLParser(resolve_entities=False)
+tree.set_default_parser(_parser)
+
+
+def find_undocumented_functions(pages, ignorelist):
+    undocumented = []
+    for page in pages:
+        filename = os.path.basename(page)
+        pagetree = tree.parse(page)
+
+        assert pagetree.getroot().tag == "refentry"
+
+        hist_section = pagetree.find("refsect1[title='History']")
+        for func in pagetree.findall("//funcprototype/funcdef/function"):
+            path = f"/refsynopsisdiv/funcsynopsis/funcprototype/funcdef/function[.='{func.text}']"
+            assert pagetree.findall(path) == [func]
+
+            if (
+                hist_section is None
+                or hist_section.find(f"para/function[.='{func.text}()']") is None
+            ):
+                if func.text not in ignorelist:
+                    undocumented.append((filename, func.text))
+    return undocumented
+
+
+def construct_path(element):
+    tag = element.tag
+
+    if tag == "refentry":
+        return ""
+
+    predicate = ""
+    if tag == "varlistentry":
+        text = "".join(element.find("term").itertext())
+        predicate = f'[term="{text}"]'
+    elif tag.startswith("refsect"):
+        text = "".join(element.find("title").itertext())
+        predicate = f'[title="{text}"]'
+    elif tag == "variablelist":
+        varlists = element.getparent().findall(tag)
+        if len(varlists) > 1:
+            predicate = f"[{varlists.index(element)+1}]"
+
+    return construct_path(element.getparent()) + "/" + tag + predicate
+
+
+def find_undocumented_commands(pages, ignorelist):
+    undocumented = []
+    for page in pages:
+        filename = os.path.basename(page)
+
+        pagetree = tree.parse(page)
+        if pagetree.getroot().tag != "refentry":
+            continue
+
+        for varlistentry in pagetree.findall("*//variablelist/varlistentry"):
+            path = construct_path(varlistentry)
+
+            assert pagetree.findall(path) == [varlistentry]
+
+            listitem = varlistentry.find("listitem")
+            parent = listitem if listitem is not None else varlistentry
+
+            rev = parent.getchildren()[-1]
+            if rev.get("href") != "version-info.xml":
+                if (filename, path) not in ignorelist:
+                    undocumented.append((filename, path))
+    return undocumented
+
+
+def process_pages(pages):
+    command_pages = []
+    function_pages = []
+
+    for page in pages:
+        filename = os.path.basename(page)
+        if filename.startswith("org.freedesktop."):  # dbus
+            continue
+
+        if (
+            filename.startswith("sd_")
+            or filename.startswith("sd-")
+            or filename.startswith("udev_")
+        ):
+            function_pages.append(page)
+            continue
+
+        command_pages.append(page)
+
+    undocumented_commands = find_undocumented_commands(
+        command_pages, command_ignorelist
+    )
+    undocumented_functions = find_undocumented_functions(
+        function_pages, function_ignorelist
+    )
+
+    return undocumented_commands, undocumented_functions
+
+
+if __name__ == "__main__":
+    with open(os.path.join(os.path.dirname(__file__), "command_ignorelist")) as f:
+        command_ignorelist = []
+        for l in f.read().splitlines():
+            if l.startswith("#"):
+                continue
+            fname, path = l.split(" ", 1)
+            path = path.replace("\\n", "\n")
+            command_ignorelist.append((fname, path))
+    with open(os.path.join(os.path.dirname(__file__), "function_ignorelist")) as f:
+        function_ignorelist = f.read().splitlines()
+
+    undocumented_commands, undocumented_functions = process_pages(sys.argv[1:])
+
+    if undocumented_commands or undocumented_functions:
+        for filename, func in undocumented_functions:
+            print(
+                f"Function {func}() in {filename} isn't documented in the History section."
+            )
+        for filename, path in undocumented_commands:
+            print(filename, path, "is undocumented")
+        if undocumented_commands:
+            print(
+                "Hint: if you reorganized this part of the documentation, "
+                "please update tools/commands_ignorelist."
+            )
+
+        sys.exit(1)