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xC: make fancy-prompt.lua alignment more reliable 

And generally clean up that script.
This commit is contained in:
Přemysl Eric Janouch 2022-08-27 08:55:44 +02:00
parent 83764d1e1b
commit f7be510d26
Signed by: p
GPG Key ID: A0420B94F92B9493
2 changed files with 52 additions and 17 deletions
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36
plugins/xC/fancy-prompt.lua
View File

@ -1,7 +1,7 @@
--
-- fancy-prompt.lua: the fancy multiline prompt you probably want
--
-- Copyright (c) 2016, Přemysl Eric Janouch <p@janouch.name>
-- 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.
@ -40,7 +40,7 @@ xC.hook_prompt (function (hook)
if buffer == current then
current_n = i
elseif buffer.new_messages_count ~= buffer.new_unimportant_count then
if active ~= "" then active = active .. "," end
active = active .. ","
if buffer.highlighted then
active = active .. "!"
bg_color = "224"
@ -48,7 +48,6 @@ xC.hook_prompt (function (hook)
active = active .. i
end
end
if active ~= "" then active = "(" .. active .. ")" end
local x = current_n .. ":" .. current.name
if chan and chan.users_len ~= 0 then
local params = ""
@ -56,25 +55,34 @@ xC.hook_prompt (function (hook)
params = params .. " +" .. mode .. " " .. param
end
local modes = chan.no_param_modes .. params:sub (3)
if modes ~= "" then x = x .. "(+" .. modes .. ")" end
if modes ~= "" then
x = x .. "(+" .. modes .. ")"
end
x = x .. "{" .. chan.users_len .. "}"
end
if current.hide_unimportant then x = x .. "<H>" end
local lines, cols = xC.get_screen_size ()
x = x .. " " .. active .. string.rep (" ", cols)
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]", "?")
-- Cut off extra characters and apply formatting, including the hack.
-- FIXME: this doesn't count with full-width or zero-width characters.
-- We might want to export wcwidth() above term_from_utf8 somehow.
local overflow = utf8.offset (x, cols - 1)
if overflow then x = x:sub (1, overflow) end
-- 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 .. "\x01\x1b[0;4;1;7;38;5;" .. bg_color .. "m\x02 \x01\x1b[0;1m\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

33
xC.c
View File

@ -3776,7 +3776,7 @@ explode_text (struct exploder *self, const char *text)
if (!strchr ("\a\b\x0e\x0f\x1b" /* BEL BS SO SI ESC */, *p))
str_append_c (&filtered, *p);
size_t term_len = 0;
size_t term_len = 0, processed = 0, len;
char *term = iconv_xstrdup (self->ctx->term_from_utf8,
filtered.str, filtered.len + 1, &term_len);
str_free (&filtered);
@ -3785,11 +3785,10 @@ explode_text (struct exploder *self, const char *text)
memset (&ps, 0, sizeof ps);
wchar_t wch;
size_t len, processed = 0;
while ((len = mbrtowc (&wch, term + processed, term_len - processed, &ps)))
{
hard_assert (len != (size_t) -2 && len != (size_t) -1);
processed += len;
hard_assert ((processed += len) <= term_len);
struct line_char *c = line_char_new (wch);
c->attrs = self->attrs;
@ -10527,6 +10526,33 @@ lua_plugin_get_screen_size (lua_State *L)
return 2;
}
static int
lua_plugin_measure (lua_State *L)
{
struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
const char *line = lua_plugin_check_utf8 (L, 1);
size_t term_len = 0, processed = 0, width = 0, len;
char *term = iconv_xstrdup (plugin->ctx->term_from_utf8,
(char *) line, strlen (line) + 1, &term_len);
mbstate_t ps;
memset (&ps, 0, sizeof ps);
wchar_t wch;
while ((len = mbrtowc (&wch, term + processed, term_len - processed, &ps)))
{
hard_assert (len != (size_t) -2 && len != (size_t) -1);
hard_assert ((processed += len) <= term_len);
int wch_width = wcwidth (wch);
width += MAX (0, wch_width);
}
free (term);
lua_pushinteger (L, width);
return 1;
}
static int
lua_ctx_gc (lua_State *L)
{
@ -10547,6 +10573,7 @@ static luaL_Reg lua_plugin_library[] =
// And these are methods:
{ "get_screen_size", lua_plugin_get_screen_size },
{ "measure", lua_plugin_measure },
{ "__gc", lua_ctx_gc },
{ NULL, NULL },
};