[PATCH 4/5] scripts/import_*: update usage to include lei tips

[Eric Wong <e@80x24.org>]

These scripts probably don't offer anything useful now that
lei has fleshed out read-only MH support and v2 outputs.
---
 scripts/import_maildir        | 20 ++++++++++++++------
 scripts/import_slrnspool      | 26 ++++++++++++++++++--------
 scripts/import_vger_from_mbox |  6 +++---
 3 files changed, 35 insertions(+), 17 deletions(-)

diff --git a/scripts/import_maildir b/scripts/import_maildir
index 269f2550..7228a3ad 100755
--- a/scripts/import_maildir
+++ b/scripts/import_maildir
@@ -1,21 +1,29 @@
 #!/usr/bin/perl -w
-# Copyright (C) 2014, Eric Wong <e@80x24.org> and all contributors
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
-#
-# Script to import a Maildir into a public-inbox
 =begin usage
+Ancient script to import a Maildir into a v1 public-inbox
+
+	# this is only if you want a v1 inbox
 	export GIT_DIR=/path/to/your/repo.git
 	export GIT_AUTHOR_EMAIL='list@example.com'
 	export GIT_AUTHOR_NAME='list name'
 	./import_maildir /path/to/maildir/
+
+For v2 (strongly recommended), use:
+
+	lei convert /path/to/maildir -o /path/to/v2-inbox
+	# (and `lei daemon-kill' if you don't want the daemon to linger)
 =cut
-use strict;
-use warnings;
+use v5.12;
 use Date::Parse qw/str2time/;
 use PublicInbox::Eml;
 use PublicInbox::Git;
 use PublicInbox::Import;
-sub usage { "Usage:\n".join('', grep(/\t/, `head -n 24 $0`)) }
+sub usage {
+	open my $fh, '<', __FILE__;
+	("Usage:\n", grep { /^=begin usage/../^=cut/ and !/^=/m } <$fh>);
+}
 my $dir = shift @ARGV or die usage();
 my $git_dir = `git rev-parse --git-dir`;
 chomp $git_dir;
diff --git a/scripts/import_slrnspool b/scripts/import_slrnspool
index d9a35dfd..81df6c2e 100755
--- a/scripts/import_slrnspool
+++ b/scripts/import_slrnspool
@@ -1,20 +1,30 @@
 #!/usr/bin/perl -w
-# Copyright (C) 2015-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
-#
-# Incremental (or one-shot) importer of a slrnpull news spool
 =begin usage
+Incremental (or one-shot) importer of a slrnpull news spool.
+
+Since the news spool can appear as an MH folder, you may also use
+lei from public-inbox 2.0+ to convert it:
+
+	lei convert mh:$SLRNPULL_ROOT/news/foo/bar -o v2:/path/to/inbox/
+	# (and `lei daemon-kill' if you don't want the daemon to linger)
+
+But if you want to use this script:
+
 	export ORIGINAL_RECIPIENT=address@example.com
-	public-inbox-init $INBOX $GIT_DIR $HTTP_URL $ORIGINAL_RECIPIENT
-	./import_slrnspool SLRNPULL_ROOT/news/foo/bar
+	public-inbox-init -V2 $INBOX $INBOX_DIR $HTTP_URL $ORIGINAL_RECIPIENT
+	./import_slrnspool $SLRNPULL_ROOT/news/foo/bar
 =cut
-use strict;
-use warnings;
+use v5.12;
 use PublicInbox::Config;
 use PublicInbox::Eml;
 use PublicInbox::Import;
 use PublicInbox::Git;
-sub usage { "Usage:\n".join('',grep(/\t/, `head -n 10 $0`)) }
+sub usage {
+	open my $fh, '<', __FILE__;
+	("Usage:\n", grep { /^=begin usage/../^=cut/ and !/^=/m } <$fh>);
+}
 my $exit = 0;
 my $sighandler = sub { $exit = 1 };
 $SIG{INT} = $sighandler;
diff --git a/scripts/import_vger_from_mbox b/scripts/import_vger_from_mbox
index c33e42e4..40ccf50b 100644
--- a/scripts/import_vger_from_mbox
+++ b/scripts/import_vger_from_mbox
@@ -1,8 +1,8 @@
 #!/usr/bin/perl -w
-# Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
-use strict;
-use warnings;
+# consider `lei convert' instead since it handles more formats
+use v5.12;
 use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
 use PublicInbox::InboxWritable;
 my $usage = "usage: $0 NAME EMAIL DIR <MBOX\n";