diff --git a/blurb/blurb.py b/blurb/blurb.py
index 2b9475b..0cb87cc 100755
--- a/blurb/blurb.py
+++ b/blurb/blurb.py
@@ -49,10 +49,12 @@
from collections import OrderedDict
import glob
import hashlib
+import io
import inspect
import itertools
import math
import os
+from pathlib import Path
import re
import shlex
import shutil
@@ -1064,11 +1066,15 @@ def merge(output=None, *, forced=False):
builtins.print("You already have a", repr(output), "file.")
require_ok("Type ok to overwrite")
- news = open(output, "wt", encoding="utf-8")
+ write_news(output, versions=versions)
+
+
+def write_news(output, *, versions):
+ buff = io.StringIO()
def print(*a, sep=" "):
s = sep.join(str(x) for x in a)
- return builtins.print(s, file=news)
+ return builtins.print(s, file=buff)
print ("""
+++++++++++
@@ -1129,7 +1135,20 @@ def print(*a, sep=" "):
print(text)
print()
print("**(For information about older versions, consult the HISTORY file.)**")
- news.close()
+
+
+ new_contents = buff.getvalue()
+
+ # 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:
+ builtins.print(output, "is already up to date")
git_add_files = []
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