X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=man%2Fman1%2Fnotmuch-dump.1;h=770b00fcde6e2d0970e954553008fdf01d0e402f;hp=230deec2abd9aa5692c6c9f4062181ce7f9bd48d;hb=60cd3b9a0623a1cb71a1a1eb440accf9236a41e7;hpb=0f066ece0f6aa7c02116f8ba3f06b5a005091678

diff --git a/man/man1/notmuch-dump.1 b/man/man1/notmuch-dump.1
index 230deec2..770b00fc 100644
--- a/man/man1/notmuch-dump.1
+++ b/man/man1/notmuch-dump.1
@@ -5,6 +5,7 @@ notmuch-dump \- creates a plain-text dump of the tags of each message
 .SH SYNOPSIS
 
 .B "notmuch dump"
+.RB  [ "\-\-format=(sup|batch-tag)"  "] [--]"
 .RI "[ --output=<" filename "> ] [--]"
 .RI "[ <" search-term ">...]"
 
@@ -19,6 +20,64 @@ recreated from the messages themselves.  The output of notmuch dump is
 therefore the only critical thing to backup (and much more friendly to
 incremental backup than the native database files.)
 
+.TP 4
+.B \-\-format=(sup|batch-tag)
+
+Notmuch restore supports two plain text dump formats, both with one message-id
+per line, followed by a list of tags.
+
+.RS 4
+.TP 4
+.B sup
+
+The
+.B sup
+dump file format is specifically chosen to be
+compatible with the format of files produced by sup-dump.
+So if you've previously been using sup for mail, then the
+.B "notmuch restore"
+command provides you a way to import all of your tags (or labels as
+sup calls them).
+Each line has the following form
+
+.RS 4
+.RI < message-id >
+.B (
+.RI < tag "> ..."
+.B )
+
+with zero or more tags are separated by spaces. Note that (malformed)
+message-ids may contain arbitrary non-null characters. Note also
+that tags with spaces will not be correctly restored with this format.
+
+.RE
+
+.RE
+.RS 4
+.TP 4
+.B batch-tag
+
+The
+.B batch-tag
+dump format is intended to more robust against malformed message-ids
+and tags containing whitespace or non-\fBascii\fR(7) characters.
+Each line has the form
+
+.RS 4
+.RI "+<" "encoded-tag" "> " "" "+<" "encoded-tag" "> ... -- " "" " id:<" encoded-message-id >
+
+where encoded means that every byte not matching the regex
+.B [A-Za-z0-9@=.,_+-]
+is replace by
+.B %nn
+where nn is the two digit hex encoding.
+The astute reader will notice this is a special case of the batch input
+format for \fBnotmuch-tag\fR(1); note that the single message-id query is
+mandatory for \fBnotmuch-restore\fR(1).
+
+.RE
+
+
 With no search terms, a dump of all messages in the database will be
 generated.  A "--" argument instructs notmuch that the
 remaining arguments are search terms.