[PATCH v8 1/2] send-email: programmatically generate bash completions

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"git send-email --git-completion-helper" only prints "format-patch"
flags. Make it print "send-email" flags as well, extracting them
programmatically from its three existing "GetOptions".

Introduce a "uniq" subroutine, otherwise --cc-cover, --to-cover and
other flags would show up twice. In addition, deduplicate flags common
to both "send-email" and "format-patch", like --from.

Remove extraneous flags: --h and --git-completion-helper.

Add trailing "=" to options that expect an argument, inline with
the format-patch implementation.

Add a completion test for "send-email --validate", a send-email flag.

Signed-off-by: Thiago Perrotta <tbperrotta@xxxxxxxxx>
Based-on-patch-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 contrib/completion/git-completion.bash | 11 +-----
 git-send-email.perl                    | 53 +++++++++++++++++++++-----
 t/t9902-completion.sh                  |  3 ++
 3 files changed, 48 insertions(+), 19 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 4bdd27ddc8..1b73a4dcc0 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2359,16 +2359,7 @@ _git_send_email ()
 		return
 		;;
 	--*)
-		__gitcomp_builtin send-email "--annotate --bcc --cc --cc-cmd --chain-reply-to
-			--compose --confirm= --dry-run --envelope-sender
-			--from --identity
-			--in-reply-to --no-chain-reply-to --no-signed-off-by-cc
-			--no-suppress-from --no-thread --quiet --reply-to
-			--signed-off-by-cc --smtp-pass --smtp-server
-			--smtp-server-port --smtp-encryption= --smtp-user
-			--subject --suppress-cc= --suppress-from --thread --to
-			--validate --no-validate
-			$__git_format_patch_extra_options"
+		__gitcomp_builtin send-email "$__git_format_patch_extra_options"
 		return
 		;;
 	esac
diff --git a/git-send-email.perl b/git-send-email.perl
index e65d969d0b..b45c7da3ab 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -113,9 +113,38 @@ sub usage {
 	exit(1);
 }
 
+sub uniq {
+	my %seen;
+	grep !$seen{$_}++, @_;
+}
+
 sub completion_helper {
-    print Git::command('format-patch', '--git-completion-helper');
-    exit(0);
+	my ($original_opts) = @_;
+	my %not_for_completion = (
+		"git-completion-helper" => undef,
+		"h" => undef,
+	);
+	my @send_email_opts = ();
+
+	foreach my $key (keys %$original_opts) {
+		unless (exists $not_for_completion{$key}) {
+			$key =~ s/!$//;
+
+			if ($key =~ /[:=][si]$/) {
+				$key =~ s/[:=][si]$//;
+				push (@send_email_opts, "--$_=") foreach (split (/\|/, $key));
+			} else {
+				push (@send_email_opts, "--$_") foreach (split (/\|/, $key));
+			}
+		}
+	}
+
+	my @format_patch_opts = split(/ /, Git::command('format-patch', '--git-completion-helper'));
+	my @opts = (@send_email_opts, @format_patch_opts);
+	@opts = uniq (grep !/^$/, @opts);
+	# There's an implicit '\n' here already, no need to add an explicit one.
+	print "@opts";
+	exit(0);
 }
 
 # most mail servers generate the Date: header, but not all...
@@ -425,10 +454,11 @@ sub config_regexp {
 	my $key = "sendemail.identity";
 	$identity = Git::config(@repo, $key) if exists $known_config_keys{$key};
 }
-my $rc = GetOptions(
+my %identity_options = (
 	"identity=s" => \$identity,
 	"no-identity" => \$no_identity,
 );
+my $rc = GetOptions(%identity_options);
 usage() unless $rc;
 undef $identity if $no_identity;
 
@@ -444,14 +474,17 @@ sub config_regexp {
 
 my $help;
 my $git_completion_helper;
-$rc = GetOptions("h" => \$help,
-                 "dump-aliases" => \$dump_aliases);
+my %dump_aliases_options = (
+	"h" => \$help,
+	"dump-aliases" => \$dump_aliases,
+);
+$rc = GetOptions(%dump_aliases_options);
 usage() unless $rc;
 die __("--dump-aliases incompatible with other options\n")
     if !$help and $dump_aliases and @ARGV;
-$rc = GetOptions(
+my %options = (
 		    "sender|from=s" => \$sender,
-                    "in-reply-to=s" => \$initial_in_reply_to,
+		    "in-reply-to=s" => \$initial_in_reply_to,
 		    "reply-to=s" => \$reply_to,
 		    "subject=s" => \$initial_subject,
 		    "to=s" => \@getopt_to,
@@ -508,7 +541,8 @@ sub config_regexp {
 		    "batch-size=i" => \$batch_size,
 		    "relogin-delay=i" => \$relogin_delay,
 		    "git-completion-helper" => \$git_completion_helper,
-	 );
+);
+$rc = GetOptions(%options);
 
 # Munge any "either config or getopt, not both" variables
 my @initial_to = @getopt_to ? @getopt_to : ($no_to ? () : @config_to);
@@ -516,7 +550,8 @@ sub config_regexp {
 my @initial_bcc = @getopt_bcc ? @getopt_bcc : ($no_bcc ? () : @config_bcc);
 
 usage() if $help;
-completion_helper() if $git_completion_helper;
+my %all_options = (%options, %dump_aliases_options, %identity_options);
+completion_helper(\%all_options) if $git_completion_helper;
 unless ($rc) {
     usage();
 }
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 11573936d5..a4faf64184 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -2139,6 +2139,9 @@ test_expect_success PERL 'send-email' '
 	--cover-from-description=Z
 	--cover-letter Z
 	EOF
+	test_completion "git send-email --val" <<-\EOF &&
+	--validate Z
+	EOF
 	test_completion "git send-email ma" "main "
 '
 
-- 
2.33.1




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