Add extended keybindings to the fzf dialog

By default on Enter we show the popup, so these bindings allow to open
the docs with alternative sinks instead.

autoload/clue/fzf.vim

@@ -1,9 +1,21 @@
+let s:actions = ["ctrl-b", "ctrl-d", "ctrl-z"]
+
 func clue#fzf#show(doc)
 	let l = clue#dash#get_all(a:doc)
 	let a = map(l, {_, v -> v.name . "\t" . clue#dash#html_absolute_path(a:doc, clue#dash#sanitize_sqlite_path(v.path))})
-	call fzf#run(fzf#wrap(#{source: a, sink: function('clue#fzf#sink'), options: ['--delimiter', "\t", '--with-nth', '1', '--preview', 'pandoc -w plain -r html {2}']}))
+	call fzf#run(fzf#wrap(#{source: a, sinklist: function('clue#fzf#sink'), options: ['--delimiter', "\t", '--with-nth', '1', '--preview', 'pandoc -w plain -r html {2}', '--expect', join(s:actions, ',')]}))
 endfunc
 
-func clue#fzf#sink(s)
-	call clue#dash#open_external(strcharpart(a:s, stridx(a:s, "\t") + 1))
+func clue#fzf#sink(l)
+	let k = strcharpart(a:l[0], 5)
+	let t = stridx(a:l[1], "\t")
+	let q = strcharpart(a:l[1], 0, t)
+	let p = strcharpart(a:l[1], t + 1)
+	if k == "b"
+		call clue#dash#open_external(p)
+	elseif k == "d" || k == "z"
+		call clue#dash#query_external(q)
+	else
+		call clue#dash#show_pandoc(p)
+	endif
 endfunc