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require "pathname"
module IRB
module HistorySavingAbility # :nodoc:
def support_history_saving?
true
end
def reset_history_counter
@loaded_history_lines = self.class::HISTORY.size
end
def load_history
history = self.class::HISTORY
if history_file = IRB.conf[:HISTORY_FILE]
history_file = File.expand_path(history_file)
end
history_file = IRB.rc_file("_history") unless history_file
if history_file && File.exist?(history_file)
File.open(history_file, "r:#{IRB.conf[:LC_MESSAGES].encoding}") do |f|
f.each { |l|
l = l.chomp
if self.class == RelineInputMethod and history.last&.end_with?("\\")
history.last.delete_suffix!("\\")
history.last << "\n" << l
else
history << l
end
}
end
@loaded_history_lines = history.size
@loaded_history_mtime = File.mtime(history_file)
end
end
def save_history
history = self.class::HISTORY.to_a
if num = IRB.conf[:SAVE_HISTORY] and (num = num.to_i) != 0
if history_file = IRB.conf[:HISTORY_FILE]
history_file = File.expand_path(history_file)
end
history_file = IRB.rc_file("_history") unless history_file
# When HOME and XDG_CONFIG_HOME are not available, history_file might be nil
return unless history_file
# Change the permission of a file that already exists[BUG #7694]
begin
if File.stat(history_file).mode & 066 != 0
File.chmod(0600, history_file)
end
rescue Errno::ENOENT
rescue Errno::EPERM
return
rescue
raise
end
if File.exist?(history_file) &&
File.mtime(history_file) != @loaded_history_mtime
history = history[@loaded_history_lines..-1] if @loaded_history_lines
append_history = true
end
pathname = Pathname.new(history_file)
unless Dir.exist?(pathname.dirname)
warn "Warning: The directory to save IRB's history file does not exist. Please double check `IRB.conf[:HISTORY_FILE]`'s value."
return
end
File.open(history_file, (append_history ? 'a' : 'w'), 0o600, encoding: IRB.conf[:LC_MESSAGES]&.encoding) do |f|
hist = history.map{ |l| l.scrub.split("\n").join("\\\n") }
unless append_history
begin
hist = hist.last(num) if hist.size > num and num > 0
rescue RangeError # bignum too big to convert into `long'
# Do nothing because the bignum should be treated as infinity
end
end
f.puts(hist)
end
end
end
end
end
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