Add a script to generate ChangeLog from "git diff"

1 files changed, 105 insertions, 0 deletions

diff --git a/gen-changelog.py b/gen-changelog.py
new file mode 100755
index 000000000..91909b254
--- /dev/null
+++ b/gen-changelog.py
@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+
+# LFS ChangeLog generator for trivial package addition, removal, and update
+
+from subprocess import Popen, PIPE
+from urllib.request import urlopen
+from os import getenv
+
+def get_entity(line):
+    line = line[1:]
+    if not line.startswith("<!ENTITY "):
+        return None
+    quote_pos = line.find(' "')
+    key = line[len("<!ENTITY "):quote_pos]
+    value = line[quote_pos + 2:]
+    value = value[:value.find('"')]
+    return (key, value)
+
+def expand_entity(ent, key):
+    value = ent[key]
+    out = ""
+    sub_ent = ""
+    for c in value:
+        if c == '&':
+            sub_ent = c
+        elif sub_ent:
+            sub_ent += c
+            if c == ';':
+                out += expand_entity(ent, sub_ent[1:-1])
+                sub_ent = ""
+        else:
+            out += c
+    return out
+
+git_diff = Popen(["git", "diff", "-U999999", "packages.ent"],
+                 stdout = PIPE,
+                 text = True)
+stdout, _ = git_diff.communicate()
+
+lines = stdout.rstrip().split("\n")
+ent = [get_entity(i) for i in lines if i[0] != '-']
+ent = dict(i for i in ent if i)
+
+add = set()
+rem = set()
+
+for l in lines:
+    if l[0] in '+-':
+        pair = get_entity(l)
+        if pair:
+            key, _ = pair
+            if key.endswith('-md5'):
+                pkg = key[:-len('-md5')]
+                if l[0] == '+':
+                    add.add(pkg)
+                else:
+                    rem.add(pkg)
+
+upd = add.intersection(rem)
+add = add.symmetric_difference(upd)
+rem = rem.symmetric_difference(upd)
+
+ticket = {}
+security = set()
+url = 'https://wiki.linuxfromscratch.org/lfs/report/1?format=tab'
+tsv = urlopen(url)
+for i in tsv:
+    fields = i.decode().split('\t')
+    if len(fields) >= 2:
+        pkg = fields[1].lower()
+        pos = pkg.find(' ')
+        if pos > 0:
+            pkg = pkg[:pos]
+        tic = fields[0]
+        sec = len(fields) >= 3 and fields[2].startswith("high")
+        ticket[pkg] = tic
+        security.add(pkg)
+
+print("Plain Text:")
+for (s, act) in [(upd, "Update to "), (add, "Add ")]:
+    for i in s:
+        pkgver = i + "-" + expand_entity(ent, i + "-version")
+        out = act + pkgver
+        if pkgver in ticket:
+            out += ' (#' + ticket[pkgver] + ')'
+        print(out)
+for i in rem:
+    print("Remove", i)
+
+print("---------------------")
+
+print("XML")
+name = getenv("USER")
+for (s, act) in [(upd, "Update to "), (add, "Add ")]:
+    for i in s:
+        print('        <listitem>')
+        pkgver = i + "-" + expand_entity(ent, i + "-version")
+        out = '          <para>[' + name + '] - ' + act + pkgver + "."
+        if pkgver in ticket:
+            out += "  Fixes\n          "
+            out += "<ulink url='&lfs-ticket-root;" + ticket[pkgver] + "'>#"
+            out += ticket[pkgver] + "</ulink>."
+        out += "</para>"
+        print(out)
+        print('        </listitem>')