class Byebug::ListCommand
List parts of the source code.
Public Class Methods
description()
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# File lib/byebug/commands/list.rb, line 31 def description prettify <<-EOD l[ist][[-=]][ nn-mm] Lists lines of code forward from current line or from the place where code was last listed. If "list-" is specified, lists backwards instead. If "list=" is specified, lists from current line regardless of where code was last listed. A line range can also be specified to list specific sections of code. EOD end
names()
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# File lib/byebug/commands/list.rb, line 27 def names %w(list) end
Public Instance Methods
execute()
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# File lib/byebug/commands/list.rb, line 12 def execute exist = File.exist?(@state.file) return errmsg "No sourcefile available for #{@state.file}\n" unless exist @match ||= match('list') max_lines = n_lines(@state.file) b, e = range(@match[2], max_lines) return errmsg('Invalid line range') unless valid_range?(b, e, max_lines) display_lines(b, e) @state.prev_line = b end
regexp()
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# File lib/byebug/commands/list.rb, line 8 def regexp /^\s* l(?:ist)? (?:\s*([-=])|\s+(\S+))? \s*$/x end
Private Instance Methods
amend(line, max_line)
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# File lib/byebug/commands/list.rb, line 96 def amend(line, max_line) return 1 if line < 1 [max_line, line].min end
display_lines(min, max)
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Show lines in @state.file from line number <min> to line number <max>.
# File lib/byebug/commands/list.rb, line 115 def display_lines(min, max) puts "\n[#{min}, #{max}] in #{@state.file}" File.foreach(@state.file).with_index do |line, lineno| return if lineno + 1 > max next unless (min..max).include?(lineno + 1) mark = lineno + 1 == @state.line ? '=> ' : ' ' puts format("#{mark}%#{max.to_s.size}d: %s", lineno + 1, line) end end
lower(size, direction = '+')
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# File lib/byebug/commands/list.rb, line 102 def lower(size, direction = '+') return @state.line - size / 2 if direction == '=' || !@state.prev_line move(@state.prev_line, size, direction) end
move(line, size, direction = '+')
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# File lib/byebug/commands/list.rb, line 108 def move(line, size, direction = '+') line.send(direction, size) end
parse_range(input, size, max_line)
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# File lib/byebug/commands/list.rb, line 80 def parse_range(input, size, max_line) first, err = get_int(input.split(/[-,]/)[0], 'List', 1, max_line) return [-1, -1] if err if input.split(/[-,]/)[1] last, _ = get_int(input.split(/[-,]/)[1], 'List', 1, max_line) return [-1, -1] unless last last = amend(last, max_line) else first -= (size / 2) end [first, last || move(first, size - 1)] end
range(input, max_line)
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Line range to be printed by `list`.
If <input> is set, range is parsed from it.
Otherwise it's automatically chosen.
# File lib/byebug/commands/list.rb, line 53 def range(input, max_line) size = [Setting[:listsize], max_line].min return set_range(size, max_line) unless input parse_range(input, size, max_line) end
set_range(size, max_line)
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Set line range to be printed by list
@param size - number of lines to be printed @param max_line - max line number that can be printed
@return first line number to list @return last line number to list
# File lib/byebug/commands/list.rb, line 74 def set_range(size, max_line) first = amend(lower(size, @match[1] || '+'), max_line - size + 1) [first, move(first, size - 1)] end
valid_range?(first, last, max)
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# File lib/byebug/commands/list.rb, line 61 def valid_range?(first, last, max) first <= last && (1..max).include?(first) && (1..max).include?(last) end