+# Shell completion helper. Used by lei-completion.bash and hopefully
+# other shells. Try to do as much here as possible to avoid redundancy
+# and improve maintainability.
+sub lei__complete {
+ my ($self, @argv) = @_; # argv = qw(lei and any other args...)
+ shift @argv; # ignore "lei", the entire command is sent
+ @argv or return puts $self, grep(!/^_/, keys %CMD);
+ my $cmd = shift @argv;
+ my $info = $CMD{$cmd} // do { # filter matching commands
+ @argv or puts $self, grep(/\A\Q$cmd\E/, keys %CMD);
+ return;
+ };
+ my ($proto, undef, @spec) = @$info;
+ my $cur = pop @argv;
+ my $re = defined($cur) ? qr/\A\Q$cur\E/ : qr/./;
+ if (substr($cur // '-', 0, 1) eq '-') { # --switches
+ # gross special case since the only git-config options
+ # Consider moving to a table if we need more special cases
+ # we use Getopt::Long for are the ones we reject, so these
+ # are the ones we don't reject:
+ if ($cmd eq 'config') {
+ puts $self, grep(/$re/, keys %CONFIG_KEYS);
+ @spec = qw(add z|null get get-all unset unset-all
+ replace-all get-urlmatch
+ remove-section rename-section
+ name-only list|l edit|e
+ get-color-name get-colorbool);
+ # fall-through
+ }
+ # TODO: arg support
+ puts $self, grep(/$re/, map { # generate short/long names
+ my $eq = '';
+ if (s/=.+\z//) { # required arg, e.g. output|o=i
+ $eq = '=';
+ } elsif (s/:.+\z//) { # optional arg, e.g. mid:s
+ } else { # negation: solve! => no-solve|solve
+ s/\A(.+)!\z/no-$1|$1/;
+ }
+ map {
+ length > 1 ? "--$_$eq" : "-$_"
+ } split(/\|/, $_, -1) # help|h
+ } grep { !ref } @spec); # filter out $GLP_PASS ref
+ } elsif ($cmd eq 'config' && !@argv && !$CONFIG_KEYS{$cur}) {
+ puts $self, grep(/$re/, keys %CONFIG_KEYS);
+ }
+ # TODO: URLs, pathnames, OIDs, MIDs, etc... See optparse() for
+ # proto parsing.
+}
+