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|
# simple ass modal ass line ass editor
fn list_insert(items, index, value) do
let result = {}
for position in 0..index do result:push(items[position]) end
result:push(value)
for position in index..items:len() do result:push(items[position]) end
return result
end
fn list_delete(items, low, high) do
let result = {}
for position in 0..items:len() do if (position < low or position > high) result:push(items[position]) end
return result
end
fn ed_is_digit(character) do
const code = character:ascii()
return code >= 48 and code <= 57
end
# parse one address at index
fn ed_addr(state, line, index) do
if index >= line:len() return { value = -1, next = index }
if line[index] == "." return { value = state.dot, next = index + 1 }
if line[index] == "$" return { value = state.lines:len() - 1, next = index + 1 }
if ed_is_digit(line[index]) do
let number = 0
let scan = index
while (scan < line:len() and ed_is_digit(line[scan])) do number = number * 10 + (line[scan]:ascii() - 48) scan += 1 end
return { value = number - 1, next = scan }
end
return { value = -1, next = index }
end
# split a command line into low, high and command
fn ed_parse(state, line) do
let index = 0
let low = -1
let high = -1
if (line:len() > 0 and (line[0] == "," or line[0] == "%")) do
low = 0
high = state.lines:len() - 1
index = 1
end
else do
const first_addr = ed_addr(state, line, 0)
if first_addr.value >= 0 do low = first_addr.value index = first_addr.next end
if (index < line:len() and line[index] == ",") do
index += 1
const second_addr = ed_addr(state, line, index)
if second_addr.value >= 0 do high = second_addr.value index = second_addr.next end
else do high = state.lines:len() - 1 end
end
end
if low < 0 do low = state.dot end
if high < 0 do high = low end
const command = if index < line:len() line[index..] else ""
return { low = low, high = high, command = command }
end
fn ed_print(state, low, high, numbered) do
let index = low
while index <= high do
if (index >= 0 and index < state.lines:len()) do
if numbered do puts("#{index + 1}\t#{state.lines[index]}\n") end
else do puts("#{state.lines[index]}\n") end
end
index += 1
end
if (high >= 0 and high < state.lines:len()) do state.dot = high end
end
fn ed_goto(state, low) do
if state.lines:len() == 0 do puts("?\n") return :nil end
let target = low
if target < 0 do target = 0 end
if target >= state.lines:len() do target = state.lines:len() - 1 end
state.dot = target
puts("#{state.lines[target]}\n")
end
fn ed_begin_input(state, position) do
let clamped = position
if clamped < 0 do clamped = 0 end
if clamped > state.lines:len() do clamped = state.lines:len() end
state.input = :true
state.insert_at = clamped
end
fn ed_delete(state, low, high) do
state.lines = list_delete(state.lines, low, high)
state.dirty = :true
let new_dot = low
if new_dot >= state.lines:len() do new_dot = state.lines:len() - 1 end
if new_dot < 0 do new_dot = 0 end
state.dot = new_dot
end
fn ed_change(state, low, high) do
ed_delete(state, low, high)
ed_begin_input(state, low)
end
fn ed_join(items) do
let result = ""
for index in 0..items:len() do result = result ~ items[index] ~ "\n" end
return result
end
fn ed_write(state, command) do
let path = state.path
if command:len() > 1 do
const filename = command[1..]:trim()
if filename:len() > 0 do path = expand_path(filename) end
end
if path:len() == 0 do puts("?\n") return :nil end
const contents = ed_join(state.lines)
fs:store(path, contents)
state.path = path
state.dirty = :false
puts("#{contents:len()}\n")
end
fn ed_quit(state) do
state.active = :false
puts(prompt())
end
global ed_state = { active = :false, input = :false, path = "", lines = {}, dot = 0, insert_at = 0, dirty = :false }
fn gils_ed(context) do
ed_state.active = :true
ed_state.input = :false
ed_state.dirty = :false
ed_state.lines = {}
ed_state.path = if context.argv:len() > 1 expand_path(context.argv[1]) else ""
if ed_state.path:len() > 0 do
const size = fs:size(ed_state.path)
if size > 0 do
const contents = fs:read_bytes(ed_state.path, 0, size)
const raw_lines = contents:split("\n")
for index in 0..raw_lines:len() do
if (index < raw_lines:len() - 1 or raw_lines[index]:len() > 0) do ed_state.lines:push(raw_lines[index]) end
end
puts("#{size}\n")
end
else do puts("#{ed_state.path}: new file\n") end
end
ed_state.dot = if ed_state.lines:len() > 0 ed_state.lines:len() - 1 else 0
return :hold
end
fn gils_ed_feed(line) do
const state = ed_state
if state.input do
if line == "." do state.input = :false end
else do
state.lines = list_insert(state.lines, state.insert_at, line)
state.insert_at += 1
state.dot = state.insert_at - 1
state.dirty = :true
end
return :nil
end
if line:len() == 0 do
if state.lines:len() == 0 do puts("?\n") return :nil end
if state.dot < state.lines:len() - 1 do state.dot += 1 end
puts("#{state.lines[state.dot]}\n")
return :nil
end
const parsed = ed_parse(state, line)
const command_char = if parsed.command:len() > 0 parsed.command[0] else ""
match command_char
| "p" => ed_print(state, parsed.low, parsed.high, :false)
| "n" => ed_print(state, parsed.low, parsed.high, :true)
| "a" => ed_begin_input(state, parsed.low + 1)
| "i" => ed_begin_input(state, parsed.low)
| "c" => ed_change(state, parsed.low, parsed.high)
| "d" => ed_delete(state, parsed.low, parsed.high)
| "w" => ed_write(state, parsed.command)
| "q" => ed_quit(state)
| "=" => puts("#{state.dot + 1}\n")
| "" => ed_goto(state, parsed.low)
| _ => puts("?\n")
end
fn gils_ed_active() ed_state.active
register("ed [path]", "gils", "the standard editor (a i d p w q)", gils_ed)
|
