1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
# frozen_string_literal: true
class Pry
# A class to manage the loading of files through the REPL loop.
# This is an interesting trick as it processes your file as if it
# was user input in an interactive session. As a result, all Pry
# commands are available, and they are executed non-interactively. Furthermore
# the session becomes interactive when the repl loop processes a
# 'make-interactive' command in the file. The session also becomes
# interactive when an exception is encountered, enabling you to fix
# the error before returning to non-interactive processing with the
# 'make-non-interactive' command.
class REPLFileLoader
def initialize(file_name)
full_name = File.expand_path(file_name)
raise "No such file: #{full_name}" unless File.exist?(full_name)
define_additional_commands
@content = File.read(full_name)
end
# Switch to interactive mode, i.e take input from the user
# and use the regular print and exception handlers.
# @param [Pry] pry_instance the Pry instance to make interactive.
def interactive_mode(pry_instance)
pry_instance.config.input = Pry.config.input
pry_instance.config.print = Pry.config.print
pry_instance.config.exception_handler = Pry.config.exception_handler
Pry::REPL.new(pry_instance).start
end
# Switch to non-interactive mode. Essentially
# this means there is no result output
# and that the session becomes interactive when an exception is encountered.
# @param [Pry] pry_instance the Pry instance to make non-interactive.
def non_interactive_mode(pry_instance, content)
pry_instance.print = proc {}
pry_instance.exception_handler = proc do |o, _e, p|
p.run_command "cat --ex"
o.puts "...exception encountered, going interactive!"
interactive_mode(pry_instance)
end
content.lines.each do |line|
break unless pry_instance.eval line, generated: true
end
return if pry_instance.eval_string.empty?
pry_instance.output.puts(
"#{pry_instance.eval_string}...exception encountered, going interactive!"
)
interactive_mode(pry_instance)
end
# Define a few extra commands useful for flipping back & forth
# between interactive/non-interactive modes
def define_additional_commands
s = self
Pry::Commands.command "make-interactive", "Make the session interactive" do
s.interactive_mode(pry_instance)
end
Pry::Commands.command(
"load-file", "Load another file through the repl"
) do |file_name|
s.non_interactive_mode(pry_instance, File.read(File.expand_path(file_name)))
end
end
# Actually load the file through the REPL by setting file content
# as the REPL input stream.
def load
non_interactive_mode(Pry.new, @content)
end
end
end
|
