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LineEdit.jl
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LineEdit.jl
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# This file is a part of Julia. License is MIT: https://julialang.org/license
module LineEdit
import ..REPL
using REPL: AbstractREPL
using ..Terminals
import ..Terminals: raw!, width, height, cmove, getX,
getY, clear_line, beep
import Base: ensureroom, show, AnyDict, position
using Base: something
abstract type TextInterface end
abstract type ModeState end
abstract type HistoryProvider end
abstract type CompletionProvider end
export run_interface, Prompt, ModalInterface, transition, reset_state, edit_insert, keymap
@nospecialize # use only declared type signatures
struct ModalInterface <: TextInterface
modes::Vector{TextInterface}
end
mutable struct Prompt <: TextInterface
# A string or function to be printed as the prompt.
prompt::Union{String,Function}
# A string or function to be printed before the prompt. May not change the length of the prompt.
# This may be used for changing the color, issuing other terminal escape codes, etc.
prompt_prefix::Union{String,Function}
# Same as prefix except after the prompt
prompt_suffix::Union{String,Function}
keymap_dict::Dict{Char}
repl::Union{AbstractREPL,Nothing}
complete::CompletionProvider
on_enter::Function
on_done::Function
hist::HistoryProvider
sticky::Bool
end
show(io::IO, x::Prompt) = show(io, string("Prompt(\"", prompt_string(x.prompt), "\",...)"))
mutable struct MIState
interface::ModalInterface
current_mode::TextInterface
aborted::Bool
mode_state::IdDict{Any,Any}
kill_ring::Vector{String}
kill_idx::Int
previous_key::Vector{Char}
key_repeats::Int
last_action::Symbol
current_action::Symbol
end
MIState(i, c, a, m) = MIState(i, c, a, m, String[], 0, Char[], 0, :none, :none)
function show(io::IO, s::MIState)
print(io, "MI State (", mode(s), " active)")
end
struct InputAreaState
num_rows::Int64
curs_row::Int64
end
mutable struct PromptState <: ModeState
terminal::AbstractTerminal
p::Prompt
input_buffer::IOBuffer
region_active::Symbol # :shift or :mark or :off
undo_buffers::Vector{IOBuffer}
undo_idx::Int
ias::InputAreaState
# indentation of lines which do not include the prompt
# if negative, the width of the prompt is used
indent::Int
refresh_lock::Threads.AbstractLock
# this would better be Threads.Atomic{Float64}, but not supported on some platforms
beeping::Float64
# this option is to detect when code is pasted in non-"bracketed paste mode" :
last_newline::Float64 # register when last newline was entered
end
options(s::PromptState) =
if isdefined(s.p, :repl) && isdefined(s.p.repl, :options)
# we can't test isa(s.p.repl, LineEditREPL) as LineEditREPL is defined
# in the REPL module
s.p.repl.options
else
REPL.GlobalOptions
end
function setmark(s::MIState, guess_region_active::Bool=true)
refresh = set_action!(s, :setmark)
s.current_action === :setmark && s.key_repeats > 0 && activate_region(s, :mark)
mark(buffer(s))
refresh && refresh_line(s)
nothing
end
# the default mark is 0
getmark(s) = max(0, buffer(s).mark)
const Region = Pair{Int,Int}
_region(s) = getmark(s) => position(s)
region(s) = Pair(extrema(_region(s))...)
bufend(s) = buffer(s).size
axes(reg::Region) = first(reg)+1:last(reg)
content(s, reg::Region = 0=>bufend(s)) = String(buffer(s).data[axes(reg)])
function activate_region(s::PromptState, state::Symbol)
@assert state in (:mark, :shift, :off)
s.region_active = state
nothing
end
activate_region(s::ModeState, state::Symbol) = false
deactivate_region(s::ModeState) = activate_region(s, :off)
is_region_active(s::PromptState) = s.region_active in (:shift, :mark)
is_region_active(s::ModeState) = false
region_active(s::PromptState) = s.region_active
region_active(s::ModeState) = :off
input_string(s::PromptState) = String(take!(copy(s.input_buffer)))
input_string_newlines(s::PromptState) = count(c->(c == '\n'), input_string(s))
function input_string_newlines_aftercursor(s::PromptState)
str = input_string(s)
isempty(str) && return 0
rest = str[nextind(str, position(s)):end]
return count(c->(c == '\n'), rest)
end
struct EmptyCompletionProvider <: CompletionProvider end
struct EmptyHistoryProvider <: HistoryProvider end
reset_state(::EmptyHistoryProvider) = nothing
complete_line(c::EmptyCompletionProvider, s) = [], true, true
terminal(s::IO) = s
terminal(s::PromptState) = s.terminal
function beep(s::PromptState, duration::Real=options(s).beep_duration,
blink::Real=options(s).beep_blink,
maxduration::Real=options(s).beep_maxduration;
colors=options(s).beep_colors,
use_current::Bool=options(s).beep_use_current)
isinteractive() || return # some tests fail on some platforms
s.beeping = min(s.beeping + duration, maxduration)
@async begin
trylock(s.refresh_lock) || return
try
orig_prefix = s.p.prompt_prefix
colors = Base.copymutable(colors)
use_current && push!(colors, prompt_string(orig_prefix))
i = 0
while s.beeping > 0.0
prefix = colors[mod1(i+=1, end)]
s.p.prompt_prefix = prefix
refresh_multi_line(s, beeping=true)
sleep(blink)
s.beeping -= blink
end
s.p.prompt_prefix = orig_prefix
refresh_multi_line(s, beeping=true)
s.beeping = 0.0
catch e
Base.showerror(stdout, e, catch_backtrace())
finally
unlock(s.refresh_lock)
end
end
nothing
end
function cancel_beep(s::PromptState)
# wait till beeping finishes
while !trylock(s.refresh_lock)
s.beeping = 0.0
sleep(.05)
end
unlock(s.refresh_lock)
nothing
end
beep(::ModeState) = nothing
cancel_beep(::ModeState) = nothing
for f in Union{Symbol,Expr}[
:terminal, :on_enter, :add_history, :_buffer, :(Base.isempty),
:replace_line, :refresh_multi_line, :input_string, :update_display_buffer,
:empty_undo, :push_undo, :pop_undo, :options, :cancel_beep, :beep,
:deactivate_region, :activate_region, :is_region_active, :region_active]
@eval ($f)(s::MIState, args...) = $(f)(state(s), args...)
end
for f in [:edit_insert, :edit_insert_newline, :edit_backspace, :edit_move_left,
:edit_move_right, :edit_move_word_left, :edit_move_word_right]
@eval function ($f)(s::MIState, args...)
set_action!(s, $(Expr(:quote, f)))
$(f)(state(s), args...)
end
end
const COMMAND_GROUPS =
Dict(:movement => [:edit_move_left, :edit_move_right, :edit_move_word_left, :edit_move_word_right,
:edit_move_up, :edit_move_down, :edit_exchange_point_and_mark],
:deletion => [:edit_clear, :edit_backspace, :edit_delete, :edit_werase,
:edit_delete_prev_word,
:edit_delete_next_word,
:edit_kill_line_forwards, :edit_kill_line_backwards, :edit_kill_region],
:insertion => [:edit_insert, :edit_insert_newline, :edit_yank],
:replacement => [:edit_yank_pop, :edit_transpose_chars, :edit_transpose_words,
:edit_upper_case, :edit_lower_case, :edit_title_case, :edit_indent,
:edit_transpose_lines_up!, :edit_transpose_lines_down!],
:copy => [:edit_copy_region],
:misc => [:complete_line, :setmark, :edit_undo!, :edit_redo!])
const COMMAND_GROUP = Dict(command=>group for (group, commands) in COMMAND_GROUPS for command in commands)
command_group(command::Symbol) = get(COMMAND_GROUP, command, :nogroup)
command_group(command::Function) = command_group(nameof(command))
# return true if command should keep active a region
function preserve_active(command::Symbol)
command ∈ [:edit_indent, :edit_transpose_lines_down!, :edit_transpose_lines_up!]
end
# returns whether the "active region" status changed visibly,
# i.e. whether there should be a visual refresh
function set_action!(s::MIState, command::Symbol)
# if a command is already running, don't update the current_action field,
# as the caller is used as a helper function
s.current_action === :unknown || return false
active = region_active(s)
## record current action
s.current_action = command
## handle activeness of the region
if startswith(String(command), "shift_") # shift-move command
if active !== :shift
setmark(s) # s.current_action must already have been set
activate_region(s, :shift)
# NOTE: if the region was already active from a non-shift
# move (e.g. ^Space^Space), the region is visibly changed
return active !== :off # active status is reset
end
elseif !(preserve_active(command) ||
command_group(command) === :movement && region_active(s) === :mark)
# if we move after a shift-move, the region is de-activated
# (e.g. like emacs behavior)
deactivate_region(s)
return active !== :off
end
false
end
set_action!(s, command::Symbol) = nothing
function common_prefix(completions)
ret = ""
c1 = completions[1]
isempty(c1) && return ret
i = 1
cc, nexti = iterate(c1, i)
while true
for c in completions
(i > lastindex(c) || c[i] != cc) && return ret
end
ret = string(ret, cc)
i >= lastindex(c1) && return ret
i = nexti
cc, nexti = iterate(c1, i)
end
end
# Show available completions
function show_completions(s::PromptState, completions)
colmax = maximum(map(length, completions))
num_cols = max(div(width(terminal(s)), colmax+2), 1)
entries_per_col, r = divrem(length(completions), num_cols)
entries_per_col += r != 0
# skip any lines of input after the cursor
cmove_down(terminal(s), input_string_newlines_aftercursor(s))
println(terminal(s))
for row = 1:entries_per_col
for col = 0:num_cols
idx = row + col*entries_per_col
if idx <= length(completions)
cmove_col(terminal(s), (colmax+2)*col)
print(terminal(s), completions[idx])
end
end
println(terminal(s))
end
# make space for the prompt
for i = 1:input_string_newlines(s)
println(terminal(s))
end
end
# Prompt Completions
function complete_line(s::MIState)
set_action!(s, :complete_line)
if complete_line(state(s), s.key_repeats)
return refresh_line(s)
else
beep(s)
return :ignore
end
end
function complete_line(s::PromptState, repeats)
completions, partial, should_complete = complete_line(s.p.complete, s)
isempty(completions) && return false
if !should_complete
# should_complete is false for cases where we only want to show
# a list of possible completions but not complete, e.g. foo(\t
show_completions(s, completions)
elseif length(completions) == 1
# Replace word by completion
prev_pos = position(s)
push_undo(s)
edit_splice!(s, (prev_pos - sizeof(partial)) => prev_pos, completions[1])
else
p = common_prefix(completions)
if !isempty(p) && p != partial
# All possible completions share the same prefix, so we might as
# well complete that
prev_pos = position(s)
push_undo(s)
edit_splice!(s, (prev_pos - sizeof(partial)) => prev_pos, p)
elseif repeats > 0
show_completions(s, completions)
end
end
return true
end
clear_input_area(terminal, s) = (_clear_input_area(terminal, s.ias); s.ias = InputAreaState(0, 0))
clear_input_area(s) = clear_input_area(s.terminal, s)
function _clear_input_area(terminal, state::InputAreaState)
# Go to the last line
if state.curs_row < state.num_rows
cmove_down(terminal, state.num_rows - state.curs_row)
end
# Clear lines one by one going up
for j = 2:state.num_rows
clear_line(terminal)
cmove_up(terminal)
end
# Clear top line
clear_line(terminal)
nothing
end
prompt_string(s::PromptState) = prompt_string(s.p)
prompt_string(p::Prompt) = prompt_string(p.prompt)
prompt_string(s::AbstractString) = s
prompt_string(f::Function) = Base.invokelatest(f)
refresh_multi_line(s::ModeState; kw...) = refresh_multi_line(terminal(s), s; kw...)
refresh_multi_line(termbuf::TerminalBuffer, s::ModeState; kw...) = refresh_multi_line(termbuf, terminal(s), s; kw...)
refresh_multi_line(termbuf::TerminalBuffer, term, s::ModeState; kw...) = (@assert term === terminal(s); refresh_multi_line(termbuf,s; kw...))
function refresh_multi_line(termbuf::TerminalBuffer, terminal::UnixTerminal, buf::IOBuffer,
state::InputAreaState, prompt = "";
indent = 0, region_active = false)
_clear_input_area(termbuf, state)
cols = width(terminal)
rows = height(terminal)
curs_row = -1 # relative to prompt (1-based)
curs_pos = -1 # 1-based column position of the cursor
cur_row = 0 # count of the number of rows
buf_pos = position(buf)
line_pos = buf_pos
regstart, regstop = region(buf)
written = 0
# Write out the prompt string
lindent = write_prompt(termbuf, prompt, hascolor(terminal))
# Count the '\n' at the end of the line if the terminal emulator does (specific to DOS cmd prompt)
miscountnl = @static Sys.iswindows() ? (isa(Terminals.pipe_reader(terminal), Base.TTY) && !Base.ispty(Terminals.pipe_reader(terminal))) : false
# Now go through the buffer line by line
seek(buf, 0)
moreinput = true # add a blank line if there is a trailing newline on the last line
lastline = false # indicates when to stop printing lines, even when there are potentially
# more (for the case where rows is too small to print everything)
# Note: when there are too many lines for rows, we still print the first lines
# even if they are going to not be visible in the end: for simplicity, but
# also because it does the 'right thing' when the window is resized
while moreinput
line = readline(buf, keep=true)
moreinput = endswith(line, "\n")
if rows == 1 && line_pos <= sizeof(line) - moreinput
# we special case rows == 1, as otherwise by the time the cursor is seen to
# be in the current line, it's too late to chop the '\n' away
lastline = true
curs_row = 1
curs_pos = lindent + line_pos
end
if moreinput && lastline # we want to print only one "visual" line, so
line = chomp(line) # don't include the trailing "\n"
end
# We need to deal with on-screen characters, so use textwidth to compute occupied columns
llength = textwidth(line)
slength = sizeof(line)
cur_row += 1
# lwrite: what will be written to termbuf
lwrite = region_active ? highlight_region(line, regstart, regstop, written, slength) :
line
written += slength
cmove_col(termbuf, lindent + 1)
write(termbuf, lwrite)
# We expect to be line after the last valid output line (due to
# the '\n' at the end of the previous line)
if curs_row == -1
line_pos -= slength # '\n' gets an extra pos
# in this case, we haven't yet written the cursor position
if line_pos < 0 || !moreinput
num_chars = line_pos >= 0 ?
llength :
textwidth(line[1:prevind(line, line_pos + slength + 1)])
curs_row, curs_pos = divrem(lindent + num_chars - 1, cols)
curs_row += cur_row
curs_pos += 1
# There's an issue if the cursor is after the very right end of the screen. In that case we need to
# move the cursor to the next line, and emit a newline if needed
if curs_pos == cols
# only emit the newline if the cursor is at the end of the line we're writing
if line_pos == 0
write(termbuf, "\n")
cur_row += 1
end
curs_row += 1
curs_pos = 0
cmove_col(termbuf, 1)
end
end
end
cur_row += div(max(lindent + llength + miscountnl - 1, 0), cols)
lindent = indent < 0 ? lindent : indent
lastline && break
if curs_row >= 0 && cur_row + 1 >= rows && # when too many lines,
cur_row - curs_row + 1 >= rows ÷ 2 # center the cursor
lastline = true
end
end
seek(buf, buf_pos)
# Let's move the cursor to the right position
# The line first
n = cur_row - curs_row
if n > 0
cmove_up(termbuf, n)
end
#columns are 1 based
cmove_col(termbuf, curs_pos + 1)
# Updated cur_row,curs_row
return InputAreaState(cur_row, curs_row)
end
function highlight_region(lwrite::AbstractString, regstart::Int, regstop::Int, written::Int, slength::Int)
if written <= regstop <= written+slength
i = thisind(lwrite, regstop-written)
lwrite = lwrite[1:i] * Base.disable_text_style[:reverse] * lwrite[nextind(lwrite, i):end]
end
if written <= regstart <= written+slength
i = thisind(lwrite, regstart-written)
lwrite = lwrite[1:i] * Base.text_colors[:reverse] * lwrite[nextind(lwrite, i):end]
end
return lwrite
end
function refresh_multi_line(terminal::UnixTerminal, args...; kwargs...)
outbuf = IOBuffer()
termbuf = TerminalBuffer(outbuf)
ret = refresh_multi_line(termbuf, terminal, args...;kwargs...)
# Output the entire refresh at once
write(terminal, take!(outbuf))
flush(terminal)
return ret
end
# Edit functionality
is_non_word_char(c) = c in """ \t\n\"\\'`@\$><=:;|&{}()[].,+-*/?%^~"""
function reset_key_repeats(f::Function, s::MIState)
key_repeats_sav = s.key_repeats
try
s.key_repeats = 0
return f()
finally
s.key_repeats = key_repeats_sav
end
end
function edit_exchange_point_and_mark(s::MIState)
set_action!(s, :edit_exchange_point_and_mark)
return edit_exchange_point_and_mark(buffer(s)) ? refresh_line(s) : false
end
function edit_exchange_point_and_mark(buf::IOBuffer)
m = getmark(buf)
m == position(buf) && return false
mark(buf)
seek(buf, m)
return true
end
char_move_left(s::PromptState) = char_move_left(s.input_buffer)
function char_move_left(buf::IOBuffer)
while position(buf) > 0
seek(buf, position(buf)-1)
c = peek(buf)
(((c & 0x80) == 0) || ((c & 0xc0) == 0xc0)) && break
end
pos = position(buf)
c = read(buf, Char)
seek(buf, pos)
return c
end
function edit_move_left(buf::IOBuffer)
if position(buf) > 0
#move to the next base UTF8 character to the left
while true
c = char_move_left(buf)
if textwidth(c) != 0 || c == '\n' || position(buf) == 0
break
end
end
return true
end
return false
end
edit_move_left(s::PromptState) = edit_move_left(s.input_buffer) ? refresh_line(s) : false
function edit_move_word_left(s)
if position(s) > 0
char_move_word_left(s.input_buffer)
return refresh_line(s)
end
return nothing
end
char_move_right(s) = char_move_right(buffer(s))
function char_move_right(buf::IOBuffer)
return !eof(buf) && read(buf, Char)
end
function char_move_word_right(buf::IOBuffer, is_delimiter=is_non_word_char)
while !eof(buf) && is_delimiter(char_move_right(buf))
end
while !eof(buf)
pos = position(buf)
if is_delimiter(char_move_right(buf))
seek(buf, pos)
break
end
end
end
function char_move_word_left(buf::IOBuffer, is_delimiter=is_non_word_char)
while position(buf) > 0 && is_delimiter(char_move_left(buf))
end
while position(buf) > 0
pos = position(buf)
if is_delimiter(char_move_left(buf))
seek(buf, pos)
break
end
end
end
char_move_word_right(s) = char_move_word_right(buffer(s))
char_move_word_left(s) = char_move_word_left(buffer(s))
function edit_move_right(buf::IOBuffer)
if !eof(buf)
# move to the next base UTF8 character to the right
while true
c = char_move_right(buf)
eof(buf) && break
pos = position(buf)
nextc = read(buf,Char)
seek(buf,pos)
(textwidth(nextc) != 0 || nextc == '\n') && break
end
return true
end
return false
end
edit_move_right(s::PromptState) = edit_move_right(s.input_buffer) ? refresh_line(s) : false
function edit_move_word_right(s)
if !eof(s.input_buffer)
char_move_word_right(s)
return refresh_line(s)
end
return nothing
end
## Move line up/down
# Querying the terminal is expensive, memory access is cheap
# so to find the current column, we find the offset for the start
# of the line.
function edit_move_up(buf::IOBuffer)
npos = findprev(isequal(UInt8('\n')), buf.data, position(buf))
npos === nothing && return false # we're in the first line
# We're interested in character count, not byte count
offset = length(content(buf, npos => position(buf)))
npos2 = something(findprev(isequal(UInt8('\n')), buf.data, npos-1), 0)
seek(buf, npos2)
for _ = 1:offset
pos = position(buf)
if read(buf, Char) == '\n'
seek(buf, pos)
break
end
end
return true
end
function edit_move_up(s)
set_action!(s, :edit_move_up)
changed = edit_move_up(buffer(s))
changed && refresh_line(s)
return changed
end
function edit_move_down(buf::IOBuffer)
npos = something(findprev(isequal(UInt8('\n')), buf.data[1:buf.size], position(buf)), 0)
# We're interested in character count, not byte count
offset = length(String(buf.data[(npos+1):(position(buf))]))
npos2 = findnext(isequal(UInt8('\n')), buf.data[1:buf.size], position(buf)+1)
if npos2 === nothing #we're in the last line
return false
end
seek(buf, npos2)
for _ = 1:offset
pos = position(buf)
if eof(buf) || read(buf, Char) == '\n'
seek(buf, pos)
break
end
end
return true
end
function edit_move_down(s)
set_action!(s, :edit_move_down)
changed = edit_move_down(buffer(s))
changed && refresh_line(s)
return changed
end
function edit_shift_move(s::MIState, move_function::Function)
@assert command_group(move_function) === :movement
set_action!(s, Symbol(:shift_, move_function))
return move_function(s)
end
# splice! for IOBuffer: convert from close-open region to index, update the size,
# and keep the cursor position and mark stable with the text
# returns the removed portion as a String
function edit_splice!(s, r::Region=region(s), ins::AbstractString = ""; rigid_mark::Bool=true)
A, B = first(r), last(r)
A >= B && isempty(ins) && return String(ins)
buf = buffer(s)
pos = position(buf)
adjust_pos = true
if A <= pos < B
seek(buf, A)
elseif B <= pos
seek(buf, pos - B + A)
else
adjust_pos = false
end
if A < buf.mark < B || A == buf.mark == B
# rigid_mark is used only if the mark is strictly "inside"
# the region, or the region is empty and the mark is at the boundary
buf.mark = rigid_mark ? A : A + sizeof(ins)
elseif buf.mark >= B
buf.mark += sizeof(ins) - B + A
end
ret = splice!(buf.data, A+1:B, codeunits(String(ins))) # position(), etc, are 0-indexed
buf.size = buf.size + sizeof(ins) - B + A
adjust_pos && seek(buf, position(buf) + sizeof(ins))
return String(ret)
end
edit_splice!(s, ins::AbstractString) = edit_splice!(s, region(s), ins)
function edit_insert(s::PromptState, c)
push_undo(s)
buf = s.input_buffer
if ! options(s).auto_indent_bracketed_paste
pos=position(buf)
if pos > 0
if buf.data[pos] != _space && string(c) != " "
options(s).auto_indent_tmp_off = false
end
if buf.data[pos] == _space
#tabulators are already expanded to space
#this expansion may take longer than auto_indent_time_threshold which breaks the timing
s.last_newline = time()
else
#if characters after new line are coming in very fast
#its probably copy&paste => switch auto-indent off for the next coming new line
if ! options(s).auto_indent_tmp_off && time() - s.last_newline < options(s).auto_indent_time_threshold
options(s).auto_indent_tmp_off = true
end
end
end
end
str = string(c)
edit_insert(buf, str)
offset = s.ias.curs_row == 1 || s.indent < 0 ?
sizeof(prompt_string(s.p.prompt)) : s.indent
if !('\n' in str) && eof(buf) &&
((position(buf) - beginofline(buf) + # size of current line
offset + sizeof(str) - 1) < width(terminal(s)))
# Avoid full update when appending characters to the end
# and an update of curs_row isn't necessary (conservatively estimated)
write(terminal(s), str)
else
refresh_line(s)
end
end
function edit_insert(buf::IOBuffer, c)
if eof(buf)
return write(buf, c)
else
s = string(c)
edit_splice!(buf, position(buf) => position(buf), s)
return sizeof(s)
end
end
# align: number of ' ' to insert after '\n'
# if align < 0: align like line above
function edit_insert_newline(s::PromptState, align::Int = 0 - options(s).auto_indent)
push_undo(s)
buf = buffer(s)
autoindent = align < 0
if autoindent && ! options(s).auto_indent_tmp_off
beg = beginofline(buf)
align = min(something(findnext(_notspace, buf.data[beg+1:buf.size], 1), 0) - 1,
position(buf) - beg) # indentation must not increase
align < 0 && (align = buf.size-beg)
#else
# align = 0
end
align < 0 && (align = 0)
edit_insert(buf, '\n' * ' '^align)
refresh_line(s)
# updating s.last_newline should happen after refresh_line(s) which can take
# an unpredictable amount of time and makes "paste detection" unreliable
if ! options(s).auto_indent_bracketed_paste
s.last_newline = time()
end
end
# align: delete up to 4 spaces to align to a multiple of 4 chars
# adjust: also delete spaces on the right of the cursor to try to keep aligned what is
# on the right
function edit_backspace(s::PromptState, align::Bool=options(s).backspace_align,
adjust=options(s).backspace_adjust)
push_undo(s)
if edit_backspace(buffer(s), align, adjust)
return refresh_line(s)
else
pop_undo(s)
return beep(s)
end
end
const _newline = UInt8('\n')
const _space = UInt8(' ')
_notspace(c) = c != _space
beginofline(buf, pos=position(buf)) = something(findprev(isequal(_newline), buf.data, pos), 0)
function endofline(buf, pos=position(buf))
eol = findnext(isequal(_newline), buf.data[pos+1:buf.size], 1)
eol === nothing ? buf.size : pos + eol - 1
end
function edit_backspace(buf::IOBuffer, align::Bool=false, adjust::Bool=false)
!align && adjust &&
throw(DomainError((align, adjust),
"if `adjust` is `true`, `align` must be `true`"))
oldpos = position(buf)
oldpos == 0 && return false
c = char_move_left(buf)
newpos = position(buf)
if align && c == ' ' # maybe delete multiple spaces
beg = beginofline(buf, newpos)
align = textwidth(String(buf.data[1+beg:newpos])) % 4
nonspace = something(findprev(_notspace, buf.data, newpos), 0)
if newpos - align >= nonspace
newpos -= align
seek(buf, newpos)
if adjust
spaces = something(findnext(_notspace, buf.data[newpos+2:buf.size], 1), 0)
oldpos = spaces == 0 ? buf.size :
buf.data[newpos+1+spaces] == _newline ? newpos+spaces :
newpos + min(spaces, 4)
end
end
end
edit_splice!(buf, newpos => oldpos)
return true
end
function edit_delete(s)
set_action!(s, :edit_delete)
push_undo(s)
if edit_delete(buffer(s))
return refresh_line(s)
else
pop_undo(s)
return beep(s)
end
end
function edit_delete(buf::IOBuffer)
eof(buf) && return false
oldpos = position(buf)
char_move_right(buf)
edit_splice!(buf, oldpos => position(buf))
return true
end
function edit_werase(buf::IOBuffer)
pos1 = position(buf)
char_move_word_left(buf, isspace)
pos0 = position(buf)
return edit_splice!(buf, pos0 => pos1)
end
function edit_werase(s::MIState)
set_action!(s, :edit_werase)
push_undo(s)
if push_kill!(s, edit_werase(buffer(s)), rev=true)
return refresh_line(s)
else
pop_undo(s)
return :ignore
end
end
function edit_delete_prev_word(buf::IOBuffer)
pos1 = position(buf)
char_move_word_left(buf)
pos0 = position(buf)
return edit_splice!(buf, pos0 => pos1)
end
function edit_delete_prev_word(s::MIState)
set_action!(s, :edit_delete_prev_word)
push_undo(s)
if push_kill!(s, edit_delete_prev_word(buffer(s)), rev=true)
return refresh_line(s)
else
pop_undo(s)
return :ignore
end
end
function edit_delete_next_word(buf::IOBuffer)
pos0 = position(buf)
char_move_word_right(buf)
pos1 = position(buf)
return edit_splice!(buf, pos0 => pos1)
end
function edit_delete_next_word(s)
set_action!(s, :edit_delete_next_word)
push_undo(s)
if push_kill!(s, edit_delete_next_word(buffer(s)))
return refresh_line(s)
else
pop_undo(s)
return :ignore
end
end
function edit_yank(s::MIState)
set_action!(s, :edit_yank)
if isempty(s.kill_ring)
beep(s)
return :ignore
end
setmark(s) # necessary for edit_yank_pop
push_undo(s)
edit_insert(buffer(s), s.kill_ring[mod1(s.kill_idx, end)])
return refresh_line(s)
end
function edit_yank_pop(s::MIState, require_previous_yank=true)
set_action!(s, :edit_yank_pop)
repeat = s.last_action ∈ (:edit_yank, :edit_yank_pop)
if require_previous_yank && !repeat || isempty(s.kill_ring)
beep(s)
return :ignore
else
require_previous_yank || repeat || setmark(s)
push_undo(s)
edit_splice!(s, s.kill_ring[mod1(s.kill_idx -= 1, end)])
return refresh_line(s)
end
end
function push_kill!(s::MIState, killed::String, concat = s.key_repeats > 0; rev=false)
isempty(killed) && return false
if concat && !isempty(s.kill_ring)
s.kill_ring[end] = rev ?
killed * s.kill_ring[end] : # keep expected order for backward deletion
s.kill_ring[end] * killed
else
push!(s.kill_ring, killed)
length(s.kill_ring) > options(s).kill_ring_max && popfirst!(s.kill_ring)
end
s.kill_idx = lastindex(s.kill_ring)
return true
end
function edit_kill_line(s::MIState, backwards::Bool=false)
buf = buffer(s)
if backwards
set_action!(s, :edit_kill_line_backwards)
pos = beginofline(buf)
endpos = position(buf)
pos == endpos && pos > 0 && (pos -= 1)
else
set_action!(s, :edit_kill_line_forwards)
pos = position(buf)
endpos = endofline(buf)
endpos == pos && buf.size > pos && (endpos += 1)
end
push_undo(s)
if push_kill!(s, edit_splice!(s, pos => endpos); rev=backwards)
return refresh_line(s)
else
pop_undo(s)
beep(s)
return :ignore
end
end
edit_kill_line_forwards(s) = edit_kill_line(s, false)
edit_kill_line_backwards(s) = edit_kill_line(s, true)
function edit_copy_region(s::MIState)
set_action!(s, :edit_copy_region)
buf = buffer(s)
push_kill!(s, content(buf, region(buf)), false) || return :ignore
if options(s).region_animation_duration > 0.0
edit_exchange_point_and_mark(s)
sleep(options(s).region_animation_duration)
edit_exchange_point_and_mark(s)
end
nothing
end
function edit_kill_region(s::MIState)
set_action!(s, :edit_kill_region)
push_undo(s)
if push_kill!(s, edit_splice!(s), false)
return refresh_line(s)
else