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--
-- fancy-prompt.lua: the fancy multiline prompt you probably want
--
-- Copyright (c) 2016 - 2022, Přemysl Eric Janouch <p@janouch.name>
--
-- Permission to use, copy, modify, and/or distribute this software for any
-- purpose with or without fee is hereby granted.
--
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
--
-- Beware that it is a hack and only goes about 90% of the way, which is why
-- this functionality is only available as a plugin in the first place
-- (well, and also for customizability).
--
-- The biggest problem is that the way we work with Readline is incompatible
-- with multiline prompts, and normal newlines just don't work. This is being
-- circumvented by using an overflowing single-line prompt with a specially
-- crafted character in the rightmost column that prevents the bar's background
-- from spilling all over the last line.
--
-- There is also a problem with C-r search rendering not clearing out the
-- background but to really fix that mode, we'd have to fully reimplement it
-- since its alternative prompt very often gets overriden by accident anyway.
xC.hook_prompt (function (hook)
local current = xC.current_buffer
local chan = current.channel
local s = current.server
local bg_color = "255"
local current_n = 0
local active = ""
for i, buffer in ipairs (xC.buffers) do
if buffer == current then
current_n = i
elseif buffer.new_messages_count ~= buffer.new_unimportant_count then
active = active .. ","
if buffer.highlighted then
active = active .. "!"
bg_color = "224"
end
active = active .. i
end
end
local x = current_n .. ":" .. current.name
if chan and chan.users_len ~= 0 then
local params = ""
for mode, param in pairs (chan.param_modes) do
params = params .. " +" .. mode .. " " .. param
end
local modes = chan.no_param_modes .. params:sub (3)
if modes ~= "" then
x = x .. "(+" .. modes .. ")"
end
x = x .. "{" .. chan.users_len .. "}"
end
if current.hide_unimportant then
x = x .. "<H>"
end
if active ~= "" then
x = x .. " (" .. active:sub (2) .. ")"
end
-- Readline 7.0.003 seems to be broken and completely corrupts the prompt.
-- However 8.0.004 seems to be fine with these, as is libedit 20191231-3.1.
--x = x:gsub("[\128-\255]", "?")
-- Align to the terminal's width and apply formatting, including the hack.
local lines, cols = xC.get_screen_size ()
local trailing, width = " ", xC.measure (x)
while cols > 0 and width >= cols do
x = x:sub (1, utf8.offset (x, -1) - 1)
trailing, width = ">", xC.measure (x)
end
x = "\x01\x1b[0;4;1;38;5;16m\x1b[48;5;" .. bg_color .. "m\x02" ..
x .. string.rep (" ", cols - width - 1) ..
"\x01\x1b[0;4;1;7;38;5;" .. bg_color .. "m\x02" ..
trailing .. "\x01\x1b[0;1m\x02"
local user_prefix = function (chan, user)
for i, chan_user in ipairs (chan.users) do
if chan_user.user == user then return chan_user.prefixes end
end
return ""
end
if s then
x = x .. "["
local state = s.state
if state == "disconnected" or state == "connecting" then
x = x .. "(" .. state .. ")"
elseif state ~= "registered" then
x = x .. "(unregistered)"
else
local user, modes = s.user, s.user_mode
if chan then x = x .. user_prefix (chan, user) end
x = x .. user.nickname
if modes ~= "" then x = x .. "(" .. modes .. ")" end
end
x = x .. "] "
else
-- There needs to be at least one character so that the cursor
-- doesn't get damaged by our hack in that last column
x = x .. "> "
end
return x
end)
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