git-mr-comment-show: initial implementation

diff --git a/git-mr-comment-show b/git-mr-comment-show
new file mode 100755 (executable)
index 0000000..0463245
--- /dev/null
+++ b/git-mr-comment-show
@@ -0,0 +1,94 @@
+#!/usr/bin/env python3
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
+
+"""
+Copyright © 2020 Frantisek Hrbata <frantisek@hrbata.com>
+This program is free software. It comes without any warranty, to
+the extent permitted by applicable law. You can redistribute it
+and/or modify it under the terms of the Do What The Fuck You Want
+To Public License, Version 2, as published by Sam Hocevar. See
+http://www.wtfpl.net/ for more details.
+"""
+
+import argparse
+import string
+import fcntl
+import sys
+import subprocess
+import mrlib
+import os
+
+parser = argparse.ArgumentParser(description="Show comments.")
+parser.add_argument("comment", nargs="*",  metavar="COMMENT",
+        help="Show comments specified by COMMENT revisions.")
+parser.add_argument("-A", "--all", action="store_true",
+        help="Show all comments. Comments entered as positional arguments or on stdin are ignored.")
+parser.add_argument("-", "--stdin", action="store_true",
+        help="Show comments for revisions read from stdin. Comments entered as positional arguments are ignored.")
+parser.add_argument("-w", "--write-revs", metavar="FILE",
+        help="Append revs for read comments to FILE (default: $HOME/.gimrr/comment.revs).")
+
+args = parser.parse_args()
+refs = mrlib.load_refs()
+
+if args.all:
+    mboxes = mrlib.filter_revs(refs, types=["mbox"])
+    stdin = "\n".join(mboxes)
+    if not stdin:
+        sys.exit()
+    rv, out, err = mrlib.run(["git", "rev-list", "--stdin"], stdin=stdin)
+    comments = out.strip().split("\n")
+else:
+    if args.stdin:
+        comments = sys.stdin.readlines()
+    else:
+        comments = args.comment
+
+    comments = mrlib.verify_comments(comments, refs)
+
+if not comments:
+    sys.exit()
+
+c2m = mrlib.comments2mrs(refs)
+
+fmt = "{}%n\
+From: %an <%ae>%n\
+Reply-To: %an <%ae>%n\
+Subject: %s%n\
+Date: %aD%n\
+DI-Egassem: %H%n\
+MIME-Version: 1.0%n\
+Content-Type: text/plain; charset=UTF-8%n\
+Content-Transfer-Encoding: 8bit%n\
+%b".format(mrlib.from_line)
+rv, out, err = mrlib.run(["git", "show", "--format={}".format(fmt), "--stdin", "--no-walk"],
+        stdin="\n".join(comments))
+
+for line in out.split("\n"):
+    if not line.startswith("DI-Egassem:"):
+        print(line)
+        continue
+    c = line.split()[1]
+    print("Message-ID: <{}.{}@localhost>".format(c2m[c], c))
+
+if args.write_revs:
+    revs_path = args.read_revs
+else:
+    revs_path = os.environ.get('HOME') + "/" + ".gimrr/comment.revs"
+
+fd = open(revs_path, "a+")
+fd.seek(0)
+fcntl.lockf(fd.fileno(), fcntl.LOCK_SH | fcntl.LOCK_NB)
+oldrevs = {r for r in fd.read().split("\n") if r}
+currevs = set(comments)
+newrevs = currevs - oldrevs
+
+try:
+    pos = fd.tell()
+    for r in newrevs:
+        fd.write("{}\n".format(r))
+    fd.flush()
+except:
+    fd.truncate(pos)
+    raise