[feature] tab completion of projects and tags

[masukomi]

add tab completion of projects and tags

start @project_<tab> should

1. autocomplete the project name if there's only one match
2. print out the list of all matching projects if more than one matches

• in both cases hitting should make the suggestion text disappear
• in both cases typing more should make the suggestion text disappear

the same behavior should apply to tags. eg. hey start @project +wal<tab>

Example tab-completion code via Linenoise. I'm currently unsure how to handle the printing of suggestions that then go away.

#!/usr/bin/env raku

use Linenoise;

my @commands = <help quit list get set>;

sub find-last-word(Str $line) {
	return $line.subst(/.*? \s? $<lw>=(\S+) $/, {"$<lw>"}  );
}

linenoiseSetCompletionCallback(-> $line, $c {
    my ( $last-word ) = find-last-word($line);

    for @commands.grep(/^ "$last-word" /).sort -> $cmd {
        linenoiseAddCompletion($c, $cmd);
    }
});

my $line = linenoise '> ';
# while (my $line = linenoise '> ').defined {
    say "got a line: $line";
# }