mq: add --currentdate and --date options to qnew and qrefresh
These options make qnew add and qrefresh update a "# Date "-style
header line. This allows proper recording of creation / last
modification dates of patches in patch queues.
Note that `qrefresh -D` only updates existing header lines. It never
adds them, and does not warn about this. This is because I expect
people to have `[default] qrefresh -D` in their .hgrc so patches with
tracked dates get updated, others are left unchanged. The suggested
setup in .hgrc is, in fact,
[default]
qnew = -D -U
qrefresh = -D
I tried to not mix header styles, so `qnew -D -U` now writes the user in
"# User "-style, while `qnew -U` still writes it "From: "-style. Also, if
`qrefresh -U` must add the user, it does so in "# User "-style if the
header contains a "# HG changeset patch" line. (This is caused by mq
not supporting the "Date: "-style header line at all - a reasonable choice
given its standard date format.)
35fb62a3a673d5322f6274a44ba6456e5e4b3b37 0 iD8DBQBEYmO2ywK+sNU5EO8RAnaYAKCO7x15xUn5mnhqWNXqk/ehlhRt2QCfRDfY0LrUq2q4oK/KypuJYPHgq1A=
2be3001847cb18a23c403439d9e7d0ace30804e9 0 iD8DBQBExUbjywK+sNU5EO8RAhzxAKCtyHAQUzcTSZTqlfJ0by6vhREwWQCghaQFHfkfN0l9/40EowNhuMOKnJk=
36a957364b1b89c150f2d0e60a99befe0ee08bd3 0 iD8DBQBFfL2QywK+sNU5EO8RAjYFAKCoGlaWRTeMsjdmxAjUYx6diZxOBwCfY6IpBYsKvPTwB3oktnPt5Rmrlys=
27230c29bfec36d5540fbe1c976810aefecfd1d2 0 iD8DBQBFheweywK+sNU5EO8RAt7VAKCrqJQWT2/uo2RWf0ZI4bLp6v82jACgjrMdsaTbxRsypcmEsdPhlG6/8F4=
fb4b6d5fe100b0886f8bc3d6731ec0e5ed5c4694 0 iD8DBQBGgHicywK+sNU5EO8RAgNxAJ0VG8ixAaeudx4sZbhngI1syu49HQCeNUJQfWBgA8bkJ2pvsFpNxwYaX3I=
23889160905a1b09fffe1c07378e9fc1827606eb 0 iD8DBQBHGTzoywK+sNU5EO8RAr/UAJ0Y8s4jQtzgS+G9vM8z6CWBThZ8fwCcCT5XDj2XwxKkz/0s6UELwjsO3LU=