String dump with correct escaping

[comodoro]

This pull request is not complete and there are things that require clarification:

• It passes tests except for test_bug_148 which I do not understand since it seems to test exactly opposite behavior to the one in the issue

• It may be easy to add an option to dump to multiline as well as escaping or not escaping all Unicode

When complete should fix #201 and indeed #148, related to #236

Reference used: https://github.com/toml-lang/toml#user-content-string

[roedoejet]

Any reason why this hasn't been merged already?

[comodoro]

As far as I remember, it is not complete for all cases and this PR explores the maintainer's attitude. It was started because of issues that surfaced in the Caster project and was not worked upon because of no response here which resulted in a switch to tomlkit.

[pirate]

Bump, would be great if this could be revisited/merged, currently you cant dump any strings containing escape sequences without getting an exception:

>>> toml.dumps({
	"reset": "\033[00;00m",
	"lightblue": "\033[01;30m",
	"lightyellow": "\033[01;33m",
	"lightred": "\033[01;35m",
	"red": "\033[01;31m",
	"green": "\033[01;32m",
	"blue": "\033[01;34m",
	"white": "\033[01;37m",
	"black": "\033[01;30m",
})

File ~/test/.venv/lib/python3.11/site-packages/toml/encoder.py:60, in dumps(o, encoder)
     58 if encoder is None:
     59     encoder = TomlEncoder(o.__class__)
---> 60 addtoretval, sections = encoder.dump_sections(o, "")
     61 retval += addtoretval
     62 outer_objs = [id(o)]

File ~/test/.venv/lib/python3.11/site-packages/toml/encoder.py:226, in TomlEncoder.dump_sections(self, o, sup)
    223     else:
    224         if o[section] is not None:
    225             retstr += (qsection + " = " +
--> 226                        unicode(self.dump_value(o[section])) + '\n')
    227 elif self.preserve and isinstance(o[section], InlineTableDict):
    228     retstr += (qsection + " = " +
    229                self.dump_inline_table(o[section]))

File ~/test/.venv/lib/python3.11/site-packages/toml/encoder.py:180, in TomlEncoder.dump_value(self, v)
    178     dump_fn = self.dump_funcs[list]
    179 # Evaluate function (if it exists) else return v
--> 180 return dump_fn(v) if dump_fn is not None else self.dump_funcs[str](v)

File ~/test/.venv/lib/python3.11/site-packages/toml/encoder.py:113, in _dump_str(v)
    111     else:
    112         joiner = "u00"
--> 113     v = [v[0] + joiner + v[1]] + v[2:]
    114 return unicode('"' + v[0] + '"')

IndexError: list index out of range