Move 'blurb merge' to blurb._merge

src/blurb/_cli.py

@@ -27,6 +27,14 @@ def prompt(prompt: str, /) -> str:
     return input(f'[{prompt}> ')
 
 
+def require_ok(prompt: str, /) -> str:
+    prompt = f"[{prompt}> "
+    while True:
+        s = input(prompt).strip()
+        if s == 'ok':
+            return s
+
+
 def subcommand(fn: CommandFunc):
     global subcommands
     subcommands[fn.__name__] = fn
@@ -138,7 +146,6 @@ def _blurb_help() -> None:
 
 
 def main() -> None:
-    global original_dir
 
     args = sys.argv[1:]
 
@@ -157,8 +164,9 @@ def main() -> None:
     if fn in (help, version):
         raise SystemExit(fn(*args))
 
+    import blurb._merge
+    blurb._merge.original_dir = os.getcwd()
     try:
-        original_dir = os.getcwd()
         chdir_to_repo_root()
 
         # map keyword arguments to options

src/blurb/_merge.py

@@ -0,0 +1,119 @@
+import os
+import sys
+from pathlib import Path
+
+from blurb._cli import require_ok, subcommand
+from blurb._versions import glob_versions, printable_version
+from blurb.blurb import Blurbs, glob_blurbs, textwrap_body
+
+original_dir: str = os.getcwd()
+
+
+@subcommand
+def merge(output: str | None = None, *, forced: bool = False) -> None:
+    """Merge all blurbs together into a single Misc/NEWS file.
+
+    Optional output argument specifies where to write to.
+    Default is <cpython-root>/Misc/NEWS.
+
+    If overwriting, blurb merge will prompt you to make sure it's okay.
+    To force it to overwrite, use -f.
+    """
+    if output:
+        output = os.path.join(original_dir, output)
+    else:
+        output = 'Misc/NEWS'
+
+    versions = glob_versions()
+    if not versions:
+        sys.exit("You literally don't have ANY blurbs to merge together!")
+
+    if os.path.exists(output) and not forced:
+        print(f'You already have a {output!r} file.')
+        require_ok('Type ok to overwrite')
+
+    write_news(output, versions=versions)
+
+
+def write_news(output: str, *, versions: list[str]) -> None:
+    buff = []
+
+    def prnt(msg: str = '', /):
+        buff.append(msg)
+
+    prnt("""
++++++++++++
+Python News
++++++++++++
+
+""".strip())
+
+    for version in versions:
+        filenames = glob_blurbs(version)
+
+        blurbs = Blurbs()
+        if version == 'next':
+            for filename in filenames:
+                if os.path.basename(filename) == 'README.rst':
+                    continue
+                blurbs.load_next(filename)
+            if not blurbs:
+                continue
+            metadata = blurbs[0][0]
+            metadata['release date'] = 'XXXX-XX-XX'
+        else:
+            assert len(filenames) == 1
+            blurbs.load(filenames[0])
+
+        header = f"What's New in Python {printable_version(version)}?"
+        prnt()
+        prnt(header)
+        prnt('=' * len(header))
+        prnt()
+
+        metadata, body = blurbs[0]
+        release_date = metadata['release date']
+
+        prnt(f'*Release date: {release_date}*')
+        prnt()
+
+        if 'no changes' in metadata:
+            prnt(body)
+            prnt()
+            continue
+
+        last_section = None
+        for metadata, body in blurbs:
+            section = metadata['section']
+            if last_section != section:
+                last_section = section
+                prnt(section)
+                prnt('-' * len(section))
+                prnt()
+            if metadata.get('gh-issue'):
+                issue_number = metadata['gh-issue']
+                if int(issue_number):
+                    body = f'gh-{issue_number}: {body}'
+            elif metadata.get('bpo'):
+                issue_number = metadata['bpo']
+                if int(issue_number):
+                    body = f'bpo-{issue_number}: {body}'
+
+            body = f'- {body}'
+            text = textwrap_body(body, subsequent_indent='  ')
+            prnt(text)
+    prnt()
+    prnt('**(For information about older versions, consult the HISTORY file.)**')
+
+    new_contents = '\n'.join(buff)
+
+    # Only write in `output` if the contents are different
+    # This speeds up subsequent Sphinx builds
+    try:
+        previous_contents = Path(output).read_text(encoding='utf-8')
+    except (FileNotFoundError, UnicodeError):
+        previous_contents = None
+    if new_contents != previous_contents:
+        Path(output).write_text(new_contents, encoding='utf-8')
+    else:
+        print(output, 'is already up to date')

src/blurb/_versions.py

@@ -0,0 +1,67 @@
+import glob
+import sys
+
+if sys.version_info[:2] >= (3, 11):
+    from contextlib import chdir
+else:
+    import os
+
+    class chdir:
+        def __init__(self, path: str, /) -> None:
+            self.path = path
+
+        def __enter__(self) -> None:
+            self.previous_cwd = os.getcwd()
+            os.chdir(self.path)
+
+        def __exit__(self, *args) -> None:
+            os.chdir(self.previous_cwd)
+
+
+def glob_versions() -> list[str]:
+    versions = []
+    with chdir('Misc/NEWS.d'):
+        for wildcard in ('2.*.rst', '3.*.rst', 'next'):
+            versions += [x.partition('.rst')[0] for x in glob.glob(wildcard)]
+    versions.sort(key=version_key, reverse=True)
+    return versions
+
+
+def version_key(element: str, /) -> str:
+    fields = list(element.split('.'))
+    if len(fields) == 1:
+        return element
+
+    # in sorted order,
+    # 3.5.0a1 < 3.5.0b1 < 3.5.0rc1 < 3.5.0
+    # so for sorting purposes we transform
+    # "3.5." and "3.5.0" into "3.5.0zz0"
+    last = fields.pop()
+    for s in ('a', 'b', 'rc'):
+        if s in last:
+            last, stage, stage_version = last.partition(s)
+            break
+    else:
+        stage = 'zz'
+        stage_version = '0'
+
+    fields.append(last)
+    while len(fields) < 3:
+        fields.append('0')
+
+    fields.extend([stage, stage_version])
+    fields = [s.rjust(6, '0') for s in fields]
+
+    return '.'.join(fields)
+
+
+def printable_version(version: str, /) -> str:
+    if version == 'next':
+        return version
+    if 'a' in version:
+        return version.replace('a', ' alpha ')
+    if 'b' in version:
+        return version.replace('b', ' beta ')
+    if 'rc' in version:
+        return version.replace('rc', ' release candidate ')
+    return version + ' final'