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module Jamstack
class Console
attr_reader :doc, :input, :scrollback
KI_RETURN = 72
KI_TAB = 70
KI_UP = 91
KI_DOWN = 93
def initialize(ctx, binding: binding(), toggle_key: 92, toggle_key_alt: 96, rml_path: "game/ui/console.rml")
@binding = binding
@toggle_key = toggle_key
@toggle_key_alt = toggle_key_alt
@open = false
@history = []
@history_index = 0
@lines = []
@max_lines = 200
@bs_prev = false
@grave_prev = false
@doc = ctx.load_document(rml_path)
@doc.hide
@scrollback = @doc.element("scrollback")
@input = @doc.element("cmd_input")
append_info("Jamstack REPL — press \\ or ~ to toggle. Enter to eval. Up/Down for history. Tab to complete.")
@input.on(:keydown) do |ev|
key = ev["key_identifier"].to_i
case key
when KI_RETURN
ev.stop_propagation
submit
when KI_TAB
ev.stop_propagation
complete
when KI_UP
ev.stop_propagation
history_prev
when KI_DOWN
ev.stop_propagation
history_next
end
end
end
def open?
@open
end
def update
ctrl = Rl.key_down?(:left_control) || Rl.key_down?(Rl::KEY_RIGHT_CONTROL)
bs_down = Rl.key_down?(@toggle_key)
grave_down = Rl.key_down?(@toggle_key_alt)
bs_pressed = bs_down && !@bs_prev
grave_pressed = grave_down && !@grave_prev
@bs_prev = bs_down
@grave_prev = grave_down
return unless bs_pressed || grave_pressed
if ctrl && @open
shift = Rl.key_down?(:left_shift) || Rl.key_down?(Rl::KEY_RIGHT_SHIFT)
char = if bs_pressed
shift ? "|" : "\\"
else
shift ? "~" : "`"
end
@input["value"] = @input["value"].to_s + char
@input.caret_end
else
toggle
end
while Rl.get_key_pressed != 0; end
while Rl.get_char_pressed != 0; end
end
def toggle
@open ? hide : show
end
def show
@doc.show
@doc.pull_to_front
@input.focus
@open = true
end
def hide
@doc.hide
@input.blur
@open = false
end
def puts(msg)
msg.to_s.split("\n").each { |line| append_line(line, "result") }
end
private
def submit
line = @input["value"].to_s
@input["value"] = ""
return if line.empty?
@history << line
@history_index = @history.length
append_line("> #{line}", "cmd")
begin
result = eval_line(line)
append_line(format_result(result), "result") unless result.nil?
rescue => e
append_line(format_error(e), "error")
end
end
def history_prev
return if @history.empty?
@history_index -= 1 if @history_index > 0
@input["value"] = @history[@history_index] || ""
@input.caret_end
end
def history_next
return if @history.empty?
@history_index += 1 if @history_index < @history.length
@input["value"] = @history[@history_index] || ""
@input.caret_end
end
def complete
text = @input["value"].to_s
return if text.empty?
receiver_expr, prefix, kind = Jamstack::Bridge.parse_completion(text)
candidates = Jamstack::Bridge.gather_candidates(receiver_expr, prefix, kind, @binding)
return if candidates.empty?
sep = kind == :constant ? "::" : "."
base = receiver_expr ? receiver_expr + sep : ""
if candidates.length == 1
@input["value"] = base + candidates[0]
else
common = Jamstack::Bridge.common_prefix(candidates)
@input["value"] = base + common if common.length > prefix.length
shown = candidates.length > 40 ? candidates.first(40) + ["..."] : candidates
append_line(shown.join(" "), "info")
end
@input.caret_end
end
def eval_line(line)
Jamstack::Bridge.eval_in_binding(line, @binding, "(console)")
end
def append_info(text)
append_line(text, "info")
end
def append_line(text, cls)
@lines << [cls, text]
@lines.shift if @lines.length > @max_lines
rebuild_scrollback
end
def rebuild_scrollback
html = @lines.map { |cls, text|
"<div class=\"line #{cls}\">#{escape_html(text)}</div>"
}.join
html += "<div id=\"scroll_end\"></div>"
@scrollback.inner_rml = html
sentinel = @scrollback.element("scroll_end")
sentinel.scroll_into_view(false) if sentinel
end
def escape_html(s)
s = s.to_s
s = s.gsub("&", "&")
s = s.gsub("<", "<")
s = s.gsub(">", ">")
s = s.gsub("\n", "<br/>")
s
end
def format_result(result)
"#{result.inspect}"
end
def format_error(e)
msg = "#{e.class}: #{e.message}"
if e.respond_to?(:backtrace) && bt = e.backtrace
bt = bt.is_a?(Array) ? bt : bt.to_a
msg += "\n " + bt.first(5).join("\n ") unless bt.empty?
end
msg
end
end
end
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