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console.lua
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console.lua
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-- Copyright (C) 2019 the mpv developers
--
-- Permission to use, copy, modify, and/or distribute this software for any
-- purpose with or without fee is hereby granted, provided that the above
-- copyright notice and this permission notice appear in all copies.
--
-- 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.
local utils = require 'mp.utils'
local assdraw = require 'mp.assdraw'
-- Default options
local opts = {
font = "",
font_size = 16,
border_size = 1,
case_sensitive = true,
history_dedup = true,
font_hw_ratio = 'auto',
}
local function detect_platform()
local platform = mp.get_property_native('platform')
if platform == 'darwin' or platform == 'windows' then
return platform
elseif os.getenv('WAYLAND_DISPLAY') then
return 'wayland'
end
return 'x11'
end
-- Pick a better default font for Windows and macOS
local platform = detect_platform()
if platform == 'windows' then
opts.font = 'Consolas'
opts.case_sensitive = false
elseif platform == 'darwin' then
opts.font = 'Menlo'
else
opts.font = 'monospace'
end
-- Apply user-set options
require 'mp.options'.read_options(opts)
local styles = {
-- Colors are stolen from base16 Eighties by Chris Kempson
-- and converted to BGR as is required by ASS.
-- 2d2d2d 393939 515151 697374
-- 939fa0 c8d0d3 dfe6e8 ecf0f2
-- 7a77f2 5791f9 66ccff 99cc99
-- cccc66 cc9966 cc99cc 537bd2
debug = '{\\1c&Ha09f93&}',
v = '{\\1c&H99cc99&}',
warn = '{\\1c&H66ccff&}',
error = '{\\1c&H7a77f2&}',
fatal = '{\\1c&H5791f9&}',
suggestion = '{\\1c&Hcc99cc&}',
selected_suggestion = '{\\1c&H2fbdfa&\\b1}',
disabled = '{\\1c&Hcccccc&}',
}
local terminal_styles = {
debug = '\027[90m',
v = '\027[32m',
warn = '\027[33m',
error = '\027[31m',
fatal = '\027[91m',
selected_suggestion = '\027[7m',
disabled = '\027[38;5;8m',
}
local repl_active = false
local osd_msg_active = false
local insert_mode = false
local pending_update = false
local line = ''
local cursor = 1
local default_prompt = '>'
local prompt = default_prompt
local default_id = 'default'
local id = default_id
local histories = {[id] = {}}
local history = histories[id]
local history_pos = 1
local searching_history = false
local log_buffers = {[id] = {}}
local key_bindings = {}
local global_margins = { t = 0, b = 0 }
local input_caller
local suggestion_buffer = {}
local selected_suggestion_index
local completion_pos
local completion_append
local path_separator = platform == 'windows' and '\\' or '/'
local completion_old_line
local completion_old_cursor
local selectable_items
local matches = {}
local selected_match = 1
local first_match_to_print = 1
local set_active
-- Naive helper function to find the next UTF-8 character in 'str' after 'pos'
-- by skipping continuation bytes. Assumes 'str' contains valid UTF-8.
local function next_utf8(str, pos)
if pos > str:len() then return pos end
repeat
pos = pos + 1
until pos > str:len() or str:byte(pos) < 0x80 or str:byte(pos) > 0xbf
return pos
end
-- As above, but finds the previous UTF-8 character in 'str' before 'pos'
local function prev_utf8(str, pos)
if pos <= 1 then return pos end
repeat
pos = pos - 1
until pos <= 1 or str:byte(pos) < 0x80 or str:byte(pos) > 0xbf
return pos
end
local function len_utf8(str)
local len = 0
local pos = 1
while pos <= str:len() do
pos = next_utf8(str, pos)
len = len + 1
end
return len
end
local function truncate_utf8(str, max_length)
local len = 0
local pos = 1
while pos <= #str do
local last_pos = pos
pos = next_utf8(str, pos)
len = len + 1
if pos > last_pos + 1 then
if len == max_length - 1 then
pos = last_pos
else
len = len + 1
end
end
if len == max_length - 1 then
return str:sub(1, pos - 1) .. '⋯'
end
end
return str
end
-- Functions to calculate the font width.
local width_length_ratio = 0.5
local osd_width, osd_height = 100, 100
---Update osd resolution if valid
local function update_osd_resolution()
local dim = mp.get_property_native('osd-dimensions')
if not dim or dim.w == 0 or dim.h == 0 then
return
end
osd_width = dim.w
osd_height = dim.h
end
local text_osd = mp.create_osd_overlay('ass-events')
text_osd.compute_bounds, text_osd.hidden = true, true
local function measure_bounds(ass_text)
update_osd_resolution()
text_osd.res_x, text_osd.res_y = osd_width, osd_height
text_osd.data = ass_text
local res = text_osd:update()
return res.x0, res.y0, res.x1, res.y1
end
---Measure text width and normalize to a font size of 1
---text has to be ass safe
local function normalized_text_width(text, size, horizontal)
local align, rotation = horizontal and 7 or 1, horizontal and 0 or -90
local template = '{\\pos(0,0)\\rDefault\\blur0\\bord0\\shad0\\q2\\an%s\\fs%s\\fn%s\\frz%s}%s'
size = size / 0.8
local width
-- Limit to 5 iterations
local repetitions_left = 5
for i = 1, repetitions_left do
size = size * 0.8
local ass = assdraw.ass_new()
ass.text = template:format(align, size, opts.font, rotation, text)
local _, _, x1, y1 = measure_bounds(ass.text)
-- Check if nothing got clipped
if x1 and x1 < osd_width and y1 < osd_height then
width = horizontal and x1 or y1
break
end
if i == repetitions_left then
width = 0
end
end
return width / size, horizontal and osd_width or osd_height
end
local function fit_on_osd(text)
local estimated_width = #text * width_length_ratio
if osd_width >= osd_height then
-- Fill the osd as much as possible, bigger is more accurate.
return math.min(osd_width / estimated_width, osd_height), true
else
return math.min(osd_height / estimated_width, osd_width), false
end
end
local measured_font_hw_ratio = nil
local function get_font_hw_ratio()
local font_hw_ratio = tonumber(opts.font_hw_ratio)
if font_hw_ratio then
return font_hw_ratio
end
if not measured_font_hw_ratio then
local alphabet = 'abcdefghijklmnopqrstuvwxyz'
local text = alphabet:rep(3)
update_osd_resolution()
local size, horizontal = fit_on_osd(text)
local normalized_width = normalized_text_width(text, size * 0.9, horizontal)
measured_font_hw_ratio = #text / normalized_width * 0.95
end
return measured_font_hw_ratio
end
-- Escape a string for verbatim display on the OSD
local function ass_escape(str)
return mp.command_native({'escape-ass', str})
end
local function calculate_max_log_lines()
if not mp.get_property_native('vo-configured')
or not mp.get_property_native('video-osd') then
-- Subtract 1 for the input line and for each line in the status line.
-- This does not detect wrapped lines.
return mp.get_property_native('term-size/h', 24) - 2 -
select(2, mp.get_property('term-status-msg'):gsub('\\n', ''))
end
return math.floor(mp.get_property_native('osd-height')
/ mp.get_property_native('display-hidpi-scale', 1)
* (1 - global_margins.t - global_margins.b)
/ opts.font_size
-- Subtract 1 for the input line and 1 for the newline
-- between the log and the input line.
- 2)
end
-- Takes a list of strings, a max width in characters and
-- optionally a max row count.
-- The result contains at least one column.
-- Rows are cut off from the top if rows_max is specified.
-- returns a string containing the formatted table and the row count
local function format_table(list, width_max, rows_max)
if #list == 0 then
return '', 0
end
local spaces_min = 2
local spaces_max = 8
local list_size = #list
local column_count = 1
local row_count = list_size
local column_widths
-- total width without spacing
local width_total = 0
local list_widths = {}
for i, item in ipairs(list) do
list_widths[i] = len_utf8(item)
end
-- use as many columns as possible
for columns = 2, list_size do
local rows_lower_bound = math.min(rows_max, math.ceil(list_size / columns))
local rows_upper_bound = math.min(rows_max, list_size,
math.ceil(list_size / (columns - 1) - 1))
for rows = rows_upper_bound, rows_lower_bound, -1 do
local cw = {}
width_total = 0
-- find out width of each column
for column = 1, columns do
local width = 0
for row = 1, rows do
local i = row + (column - 1) * rows
local item_width = list_widths[i]
if not item_width then break end
if width < item_width then
width = item_width
end
end
cw[column] = width
width_total = width_total + width
if width_total + (columns - 1) * spaces_min > width_max then
break
end
end
if width_total + (columns - 1) * spaces_min <= width_max then
row_count = rows
column_count = columns
column_widths = cw
else
break
end
end
if width_total + (columns - 1) * spaces_min > width_max then
break
end
end
local spaces = math.floor((width_max - width_total) / (column_count - 1))
spaces = math.max(spaces_min, math.min(spaces_max, spaces))
local spacing = column_count > 1
and ass_escape(string.format('%' .. spaces .. 's', ' '))
or ''
local rows = {}
for row = 1, row_count do
local columns = {}
for column = 1, column_count do
local i = row + (column - 1) * row_count
if i > #list then break end
-- more then 99 leads to 'invalid format (width or precision too long)'
local format_string = column == column_count and '%s'
or '%-' .. math.min(column_widths[column], 99) .. 's'
columns[column] = ass_escape(string.format(format_string, list[i]))
if i == selected_suggestion_index then
columns[column] = styles.selected_suggestion .. columns[column]
.. '{\\b0}'.. styles.suggestion
end
end
-- first row is at the bottom
rows[row_count - row + 1] = table.concat(columns, spacing)
end
return table.concat(rows, ass_escape('\n')), row_count
end
local function fuzzy_find(needle, haystacks)
local result = require 'mp.fzy'.filter(needle, haystacks)
if line ~= '' then -- Prevent table.sort() from reordering the items.
table.sort(result, function (i, j)
return i[3] > j[3]
end)
end
for i, value in ipairs(result) do
result[i] = value[1]
end
return result
end
local function calculate_max_terminal_width()
local max_width = mp.get_property_native('term-size/w', 80)
-- The longest module name is vo/gpu-next/libplacebo.
if mp.get_property_native('msg-module') then
max_width = max_width - 24
end
if mp.get_property_native('msg-time') then
max_width = max_width - 13
end
return max_width
end
local function populate_log_with_matches(max_width)
if not selectable_items or selected_match == 0 then
return
end
log_buffers[id] = {}
local log = log_buffers[id]
local max_log_lines = calculate_max_log_lines()
if selected_match < first_match_to_print then
first_match_to_print = selected_match
end
if first_match_to_print > 1 then
-- Reserve the first line for "n hidden items".
max_log_lines = max_log_lines - 1
end
if selected_match > first_match_to_print + max_log_lines - 1 then
-- Reserve the first line for "n hidden items" if it wasn't already.
if first_match_to_print == 1 then
max_log_lines = max_log_lines - 1
end
first_match_to_print = selected_match - max_log_lines + 1
end
local last_match_to_print = math.min(first_match_to_print + max_log_lines - 1,
#matches)
if last_match_to_print < #matches then
-- Reserve the last line for "n hidden items".
last_match_to_print = last_match_to_print - 1
-- After decrementing the last match to print, we need to check if the
-- selected match is beyond the last match to print again, and shift
-- both the first and last match to print when it is.
if selected_match > last_match_to_print then
if first_match_to_print == 1 then
-- Reserve the first line for "2 hidden items".
first_match_to_print = first_match_to_print + 1
end
first_match_to_print = first_match_to_print + 1
last_match_to_print = last_match_to_print + 1
end
end
-- When there is only 1 hidden item, print it in the previously reserved
-- line instead of printing "1 hidden items".
if first_match_to_print == 2 then
first_match_to_print = 1
end
if last_match_to_print == #matches - 1 then
last_match_to_print = #matches
end
if first_match_to_print > 1 then
log[1] = {
text = '↑ (' .. (first_match_to_print - 1) .. ' hidden items)',
style = styles.disabled,
terminal_style = terminal_styles.disabled,
}
end
for i = first_match_to_print, last_match_to_print do
log[#log + 1] = {
text = (max_width and truncate_utf8(matches[i].text, max_width)
or matches[i].text),
style = i == selected_match and styles.selected_suggestion or '',
terminal_style = i == selected_match and terminal_styles.selected_suggestion or '',
}
end
if last_match_to_print < #matches then
log[#log + 1] = {
text = '↓ (' .. (#matches - last_match_to_print) .. ' hidden items)',
style = styles.disabled,
terminal_style = terminal_styles.disabled,
}
end
end
local function print_to_terminal()
-- Clear the log after closing the console.
if not repl_active then
mp.osd_message('')
osd_msg_active = false
return
end
populate_log_with_matches(calculate_max_terminal_width())
local log = ''
for _, log_line in ipairs(log_buffers[id]) do
log = log .. log_line.terminal_style .. log_line.text .. '\027[0m\n'
end
local suggestions = ''
for i, suggestion in ipairs(suggestion_buffer) do
if i == selected_suggestion_index then
suggestions = suggestions .. terminal_styles.selected_suggestion ..
suggestion .. '\027[0m'
else
suggestions = suggestions .. suggestion
end
suggestions = suggestions .. (i < #suggestion_buffer and '\t' or '\n')
end
local before_cur = line:sub(1, cursor - 1)
local after_cur = line:sub(cursor)
-- Ensure there is a character with inverted colors to print.
if after_cur == '' then
after_cur = ' '
end
mp.osd_message(log .. suggestions .. prompt .. ' ' .. before_cur ..
'\027[7m' .. after_cur:sub(1, 1) .. '\027[0m' ..
after_cur:sub(2), 999)
osd_msg_active = true
end
-- Render the REPL and console as an ASS OSD
local function update()
pending_update = false
-- Unlike vo-configured, current-vo doesn't become falsy while switching VO,
-- which would print the log to the OSD.
if not mp.get_property('current-vo') or not mp.get_property_native('video-osd') then
print_to_terminal()
return
end
-- Clear the OSD if the console was being printed to the terminal
if osd_msg_active then
mp.osd_message('')
osd_msg_active = false
end
-- Clear the OSD if the REPL is not active
if not repl_active then
mp.set_osd_ass(0, 0, '')
return
end
local screenx, screeny = mp.get_osd_size()
local dpi_scale = mp.get_property_native('display-hidpi-scale', 1)
screenx = screenx / dpi_scale
screeny = screeny / dpi_scale
local bottom_left_margin = 6
local coordinate_top = math.floor(global_margins.t * screeny + 0.5)
local clipping_coordinates = '0,' .. coordinate_top .. ',' ..
screenx .. ',' .. screeny
local ass = assdraw.ass_new()
local has_shadow = mp.get_property('osd-border-style'):find('box$') == nil
local style = '{\\r' ..
'\\1a&H00&\\3a&H00&\\1c&Heeeeee&\\3c&H111111&' ..
(has_shadow and '\\4a&H99&\\4c&H000000&' or '') ..
'\\fn' .. opts.font .. '\\fs' .. opts.font_size ..
'\\bord' .. opts.border_size .. '\\xshad0\\yshad1\\fsp0' ..
(selectable_items and '\\q2' or '\\q1') ..
'\\clip(' .. clipping_coordinates .. ')}'
-- Create the cursor glyph as an ASS drawing. ASS will draw the cursor
-- inline with the surrounding text, but it sets the advance to the width
-- of the drawing. So the cursor doesn't affect layout too much, make it as
-- thin as possible and make it appear to be 1px wide by giving it 0.5px
-- horizontal borders.
local cheight = opts.font_size * 8
local cglyph = '{\\rDefault' ..
(mp.get_property_native('focused') == false
and '\\alpha&HFF&' or '\\1a&H44&\\3a&H44&\\4a&H99&') ..
'\\1c&Heeeeee&\\3c&Heeeeee&\\4c&H000000&' ..
'\\xbord0.5\\ybord0\\xshad0\\yshad1\\p4\\pbo24}' ..
'm 0 0 l 1 0 l 1 ' .. cheight .. ' l 0 ' .. cheight ..
'{\\p0}'
local before_cur = ass_escape(line:sub(1, cursor - 1))
local after_cur = ass_escape(line:sub(cursor))
-- Render log messages as ASS.
-- This will render at most screeny / font_size - 1 messages.
local lines_max = calculate_max_log_lines()
-- Estimate how many characters fit in one line
local width_max = math.floor((screenx - bottom_left_margin -
mp.get_property_native('osd-margin-x') * 2 * screeny / 720) /
opts.font_size * get_font_hw_ratio())
local suggestions, rows = format_table(suggestion_buffer, width_max, lines_max)
local suggestion_ass = style .. styles.suggestion .. suggestions
populate_log_with_matches()
local log_ass = ''
local log_buffer = log_buffers[id]
local log_messages = #log_buffer
local log_max_lines = math.max(0, lines_max - rows)
if log_max_lines < log_messages then
log_messages = log_max_lines
end
for i = #log_buffer - log_messages + 1, #log_buffer do
log_ass = log_ass .. style .. log_buffer[i].style ..
ass_escape(log_buffer[i].text) .. '\\N'
end
ass:new_event()
ass:an(1)
ass:pos(bottom_left_margin, screeny - bottom_left_margin - global_margins.b * screeny)
ass:append(log_ass .. '\\N')
if #suggestions > 0 then
ass:append(suggestion_ass .. '\\N')
end
ass:append(style .. ass_escape(prompt) .. ' ' .. before_cur)
ass:append(cglyph)
ass:append(style .. after_cur)
-- Redraw the cursor with the REPL text invisible. This will make the
-- cursor appear in front of the text.
ass:new_event()
ass:an(1)
ass:pos(bottom_left_margin, screeny - bottom_left_margin - global_margins.b * screeny)
ass:append(style .. '{\\alpha&HFF&}' .. ass_escape(prompt) .. ' ' .. before_cur)
ass:append(cglyph)
ass:append(style .. '{\\alpha&HFF&}' .. after_cur)
mp.set_osd_ass(screenx, screeny, ass.text)
end
local update_timer = nil
update_timer = mp.add_periodic_timer(0.05, function()
if pending_update then
update()
else
update_timer:kill()
end
end)
update_timer:kill()
-- Add a line to the log buffer (which is limited to 100 lines)
local function log_add(text, style, terminal_style)
local log_buffer = log_buffers[id]
log_buffer[#log_buffer + 1] = {
text = text,
style = style or '',
terminal_style = terminal_style or '',
}
if #log_buffer > 100 then
table.remove(log_buffer, 1)
end
if repl_active then
if not update_timer:is_enabled() then
update()
update_timer:resume()
else
pending_update = true
end
end
end
-- Add a line to the history and deduplicate
local function history_add(text)
if opts.history_dedup then
-- More recent entries are more likely to be repeated
for i = #history, 1, -1 do
if history[i] == text then
table.remove(history, i)
break
end
end
end
history[#history + 1] = text
end
local function handle_edit()
if selectable_items then
matches = {}
selected_match = 1
for i, match in ipairs(fuzzy_find(line, selectable_items)) do
matches[i] = { index = match, text = selectable_items[match] }
end
end
suggestion_buffer = {}
update()
if input_caller then
mp.commandv('script-message-to', input_caller, 'input-event', 'edited',
utils.format_json({line}))
end
end
-- Insert a character at the current cursor position (any_unicode)
local function handle_char_input(c)
if insert_mode then
line = line:sub(1, cursor - 1) .. c .. line:sub(next_utf8(line, cursor))
else
line = line:sub(1, cursor - 1) .. c .. line:sub(cursor)
end
cursor = cursor + #c
handle_edit()
end
-- Remove the character behind the cursor (Backspace)
local function handle_backspace()
if cursor <= 1 then return end
local prev = prev_utf8(line, cursor)
line = line:sub(1, prev - 1) .. line:sub(cursor)
cursor = prev
handle_edit()
end
-- Remove the character in front of the cursor (Del)
local function handle_del()
if cursor > line:len() then return end
line = line:sub(1, cursor - 1) .. line:sub(next_utf8(line, cursor))
handle_edit()
end
-- Toggle insert mode (Ins)
local function handle_ins()
insert_mode = not insert_mode
end
-- Move the cursor to the next character (Right)
local function next_char()
cursor = next_utf8(line, cursor)
suggestion_buffer = {}
update()
end
-- Move the cursor to the previous character (Left)
local function prev_char()
cursor = prev_utf8(line, cursor)
suggestion_buffer = {}
update()
end
-- Clear the current line (Ctrl+C)
local function clear()
line = ''
cursor = 1
insert_mode = false
history_pos = #history + 1
handle_edit()
end
-- Close the REPL if the current line is empty, otherwise delete the next
-- character (Ctrl+D)
local function maybe_exit()
if line == '' then
set_active(false)
else
handle_del()
end
end
local function help_command(param)
local cmdlist = mp.get_property_native('command-list')
table.sort(cmdlist, function(c1, c2)
return c1.name < c2.name
end)
local output = ''
if param == '' then
output = 'Available commands:\n'
for _, cmd in ipairs(cmdlist) do
output = output .. ' ' .. cmd.name
end
output = output .. '\n'
output = output .. 'Use "help command" to show information about a command.\n'
output = output .. "ESC or Ctrl+d exits the console.\n"
else
local cmd = nil
for _, curcmd in ipairs(cmdlist) do
if curcmd.name:find(param, 1, true) then
cmd = curcmd
if curcmd.name == param then
break -- exact match
end
end
end
if not cmd then
log_add('No command matches "' .. param .. '"!', styles.error,
terminal_styles.error)
return
end
output = output .. 'Command "' .. cmd.name .. '"\n'
for _, arg in ipairs(cmd.args) do
output = output .. ' ' .. arg.name .. ' (' .. arg.type .. ')'
if arg.optional then
output = output .. ' (optional)'
end
output = output .. '\n'
end
if cmd.vararg then
output = output .. 'This command supports variable arguments.\n'
end
end
log_add(output:sub(1, -2))
end
-- Run the current command and clear the line (Enter)
local function handle_enter()
if searching_history then
searching_history = false
selectable_items = nil
line = #matches > 0 and matches[selected_match].text or ''
cursor = #line + 1
log_buffers[id] = {}
update()
return
end
if line == '' and input_caller == nil then
return
end
if history[#history] ~= line and line ~= '' then
history_add(line)
end
if selectable_items then
if #matches > 0 then
mp.commandv('script-message-to', input_caller, 'input-event', 'submit',
utils.format_json({matches[selected_match].index}))
end
set_active(false)
elseif input_caller then
mp.commandv('script-message-to', input_caller, 'input-event', 'submit',
utils.format_json({line}))
else
-- match "help [<text>]", return <text> or "", strip all whitespace
local help = line:match('^%s*help%s+(.-)%s*$') or
(line:match('^%s*help$') and '')
if help then
help_command(help)
else
mp.command(line)
end
end
clear()
end
-- Go to the specified position in the command history
local function go_history(new_pos)
local old_pos = history_pos
history_pos = new_pos
-- Restrict the position to a legal value
if history_pos > #history + 1 then
history_pos = #history + 1
elseif history_pos < 1 then
history_pos = 1
end
-- Do nothing if the history position didn't actually change
if history_pos == old_pos then
return
end
-- If the user was editing a non-history line, save it as the last history
-- entry. This makes it much less frustrating to accidentally hit Up/Down
-- while editing a line.
if old_pos == #history + 1 and line ~= '' and history[#history] ~= line then
history_add(line)
end
-- Now show the history line (or a blank line for #history + 1)
if history_pos <= #history then
line = history[history_pos]
else
line = ''
end
cursor = line:len() + 1
insert_mode = false
suggestion_buffer = {}
update()
end
-- Go to the specified relative position in the command history (Up, Down)
local function move_history(amount)
if selectable_items then
selected_match = selected_match + amount
if selected_match > #matches then
selected_match = 1
elseif selected_match < 1 then
selected_match = #matches
end
update()
return
end
go_history(history_pos + amount)
end
-- Go to the first command in the command history (PgUp)
local function handle_pgup()
if selectable_items then
-- We don't know whether to count the "n hidden items" lines here; an
-- offset of 2 is better with 1 extra line because it scrolls from the
-- last to the first visible match, while with both extra lines that is
-- done with +3. When there are no "n hidden items" lines selected_match
-- becomes 1 with any offset >= 1.
selected_match = math.max(selected_match - calculate_max_log_lines() + 2, 1)
update()
return
end
go_history(1)
end
-- Stop browsing history and start editing a blank line (PgDown)
local function handle_pgdown()
if selectable_items then
selected_match = math.min(selected_match + calculate_max_log_lines() - 2, #matches)
update()
return
end
go_history(#history + 1)
end
local function search_history()
if selectable_items or #history == 0 then
return
end
searching_history = true
selectable_items = {}
matches = {}
selected_match = 1
first_match_to_print = 1
for i = 1, #history do
selectable_items[i] = history[#history + 1 - i]
end
for i, match in ipairs(fuzzy_find(line, selectable_items)) do
matches[i] = { index = match, text = selectable_items[match] }
end
update()
end
local function page_up_or_prev_char()
if selectable_items then
handle_pgup()
else
prev_char()
end
end
local function page_down_or_next_char()
if selectable_items then
handle_pgdown()
else
next_char()
end
end
-- Move to the start of the current word, or if already at the start, the start
-- of the previous word. (Ctrl+Left)
local function prev_word()
-- This is basically the same as next_word() but backwards, so reverse the
-- string in order to do a "backwards" find. This wouldn't be as annoying
-- to do if Lua didn't insist on 1-based indexing.
cursor = line:len() - select(2, line:reverse():find('%s*[^%s]*', line:len() - cursor + 2)) + 1
suggestion_buffer = {}
update()
end
-- Move to the end of the current word, or if already at the end, the end of
-- the next word. (Ctrl+Right)
local function next_word()
cursor = select(2, line:find('%s*[^%s]*', cursor)) + 1
suggestion_buffer = {}
update()
end
-- Move the cursor to the beginning of the line (HOME)
local function go_home()
cursor = 1
suggestion_buffer = {}
update()
end
-- Move the cursor to the end of the line (END)
local function go_end()
cursor = line:len() + 1
suggestion_buffer = {}
update()
end
-- Delete from the cursor to the beginning of the word (Ctrl+Backspace)
local function del_word()
local before_cur = line:sub(1, cursor - 1)
local after_cur = line:sub(cursor)
before_cur = before_cur:gsub('[^%s]+%s*$', '', 1)
line = before_cur .. after_cur
cursor = before_cur:len() + 1
handle_edit()
end
-- Delete from the cursor to the end of the word (Ctrl+Del)
local function del_next_word()
if cursor > line:len() then return end
local before_cur = line:sub(1, cursor - 1)