add `default_complete` option

[casperdcl]

Fixes #65 /CC @tshu-w

[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.11%.

Quality metrics	Before	After	Change
Complexity	41.79 ⛔	42.09 ⛔	0.30 👎
Method Length	110.09 🙂	112.03 🙂	1.94 👎
Working memory	18.29 ⛔	18.28 ⛔	-0.01 👍
Quality	29.55% 😞	29.44% 😞	-0.11% 👎

Other metrics	Before	After	Change
Lines	1055	1068	13

Changed files	Quality Before	Quality After	Quality Change
shtab/init.py	29.55% 😞	29.44% 😞	-0.11% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
shtab/init.py	get_bash_commands	78 ⛔	506 ⛔	26 ⛔	2.72% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	complete_zsh	62 ⛔	754 ⛔	25 ⛔	3.53% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	get_bash_commands.recurse	58 ⛔	452 ⛔	26 ⛔	4.43% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	complete_tcsh	57 ⛔	403 ⛔	19 ⛔	8.18% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	complete_zsh.recurse	18 🙂	214 ⛔	16 ⛔	31.98% 😞	Try splitting into smaller methods. Extract out complex expressions

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[tshu-w]

@casperdcl Hi, I try this commit but it doesn't work on my side. Steps:

1. install shtab

pip install git+https://github.com/iterative/shtab.git@default_complete

2. change code to use DEFAULT_FUNCTIONS:

shtab.add_argument_to(self.parser, ["-s", "--print-completion"], default_complete=DEFAULT_FUNCTIONS)

3. generate completion script:

run -s zsh

However, the script doesn't contains _default either.

……
_shtab_run_tune_options=(
  "(- :)"{-h,--help}"[show this help message and exit]"
  {-c,--config}"[Path to a configuration file in json or yaml format.]:config:"
  "--print_config[Print the configuration after applying all other arguments and exit.]:print_config:"
  "--seed_everything[Set to an int to run seed_everything with this value before classes instantiation]:seed_everything:"
  "--trainer[Path to a configuration file.]:trainer:"
……