### Example completer for environment variables

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

An example completer for names of environment variables.

```python
def EnvironCompleter(**kwargs):
    return os.environ
```

--------------------------------

### IPython Completer Example

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Example of using an IPython completer with argcomplete.

```python
import IPython
parser.add_argument("--python-name").completer = IPython.core.completer.Completer()
```

--------------------------------

### Warn Function Example

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Demonstrates how to use the 'warn' function to print messages when completions fail.

```python
from argcomplete import warn

def AwesomeWebServiceCompleter(prefix, **kwargs):
    if login_failed:
        warn("Please log in to Awesome Web Service to use autocompletion")
    return completions
```

--------------------------------

### Installation

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Install argcomplete using pip and activate global completion.

```bash
pip install argcomplete
activate-global-python-argcomplete
```

--------------------------------

### ChoicesCompleter Example

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Demonstrates how to use a custom ChoicesCompleter to provide static choices for an argparse argument.

```python
class ChoicesCompleter(object):
    def __init__(self, choices):
        self.choices = choices

    def __call__(self, **kwargs):
        return self.choices
```

```python
from argcomplete.completers import ChoicesCompleter

parser.add_argument("--protocol", choices=('http', 'https', 'ssh', 'rsync', 'wss'))
parser.add_argument("--proto").completer=ChoicesCompleter(('http', 'https', 'ssh', 'rsync', 'wss'))
```

--------------------------------

### Custom Completion Validator Example

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Shows how to override the default completion validation with a custom validator.

```python
def my_validator(completion_candidate, current_input):
    """Complete non-prefix substring matches."""
    return current_input in completion_candidate

argcomplete.autocomplete(parser, validator=my_validator)
```

--------------------------------

### PowerShell Profile Import

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Import a created PowerShell completion module into the user's profile.

```powershell
Import-Module  "~/my-awesome-script.psm1"
```

--------------------------------

### PowerShell Completion File Creation

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Create a completion file for a script in PowerShell.

```powershell
register-python-argcomplete --shell powershell my-awesome-script > ~/my-awesome-script.psm1
```

--------------------------------

### Fish Shell Completion File Creation

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Create a completion file for a script in the fish shell.

```bash
register-python-argcomplete --shell fish my-awesome-script > ~/.config/fish/completions/my-awesome-script.fish
```

--------------------------------

### Fish Shell Completion Sourcing

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Source a created completion file in the fish shell to load the completions.

```bash
source ~/.config/fish/completions/my-awesome-script.fish
```

--------------------------------

### Fish Shell Completion Registration (with Path)

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Register completions for a script using its absolute path in the fish shell.

```bash
register-python-argcomplete --shell fish $(realpath ./my-awesome-script) > ~/.config/fish/completions/my-awesome-script.fish
```

--------------------------------

### Registering an application

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Register your Python application with your shell's completion framework.

```bash
eval "$(register-python-argcomplete my-python-app)"
```

--------------------------------

### PowerShell Completion Registration

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Register completions for a script in PowerShell.

```powershell
register-python-argcomplete --shell powershell my-awesome-script | Out-String | Invoke-Expression
```

--------------------------------

### Git Bash Support Configuration

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

To enable argcomplete support in Git Bash on Windows, set the ARGCOMPLETE_USE_TEMPFILES environment variable.

```bash
export ARGCOMPLETE_USE_TEMPFILES=1
```

--------------------------------

### Bash version compatibility

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Checks the version of the running copy of bash.

```bash
echo $BASH_VERSION
```

--------------------------------

### Fish Shell Completion Registration (Direct)

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Register completions for a script in the fish shell by piping the output of register-python-argcomplete to the source command.

```bash
register-python-argcomplete --shell fish my-awesome-script | source
```

--------------------------------

### Synopsis

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Add the PYTHON_ARGCOMPLETE_OK marker and a call to argcomplete.autocomplete() to your Python application.

```python
#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK
import argcomplete, argparse
parser = argparse.ArgumentParser()
...
argcomplete.autocomplete(parser)
args = parser.parse_args()
...
```

--------------------------------

### Fish Shell Completion Description Disabling

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Disable the default behavior of adding help strings as completion descriptions in fish by filtering out the _ARGCOMPLETE_DFS variable.

```bash
register-python-argcomplete --shell fish my-awesome-script | grep -v _ARGCOMPLETE_DFS | source
```

--------------------------------

### GitHub Organization Members Autocompletion Script

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

A Python script that uses argcomplete to autocompletes GitHub organization members based on user input.

```python
#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK
import argcomplete, argparse, requests, pprint

def github_org_members(prefix, parsed_args, **kwargs):
    resource = "https://api.github.com/orgs/{org}/members".format(org=parsed_args.organization)
    return (member['login'] for member in requests.get(resource).json() if member['login'].startswith(prefix))

parser = argparse.ArgumentParser()
parser.add_argument("--organization", help="GitHub organization")
parser.add_argument("--member", help="GitHub member").completer = github_org_members

argcomplete.autocomplete(parser)
args = parser.parse_args()

pprint.pprint(requests.get("https://api.github.com/users/{m}".format(m=args.member)).json())
```

--------------------------------

### External Argcomplete Script Registration

Source: https://github.com/kislyuk/argcomplete/blob/main/contrib/README.rst

Register an argcomplete script for an arbitrary name using the --external-argcomplete-script argument.

```bash
eval "$(register-python-argcomplete --external-argcomplete-script /path/to/script arbitrary-name)"
```

--------------------------------

### Debugging argcomplete

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Enables verbose debug output for argcomplete.

```bash
_ARC_DEBUG=1 your_command
```

--------------------------------

### Specifying completers for arguments

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Specify a completer for an argument or option by setting the completer attribute of its associated action.

```python
from argcomplete.completers import EnvironCompleter

parser = argparse.ArgumentParser()
parser.add_argument("--env-var1").completer = EnvironCompleter
parser.add_argument("--env-var2").completer = EnvironCompleter
```

--------------------------------

### Fixing default completion function

Source: https://github.com/kislyuk/argcomplete/blob/main/README.rst

Command to remove a default completion function for a script.

```bash
complete -r my-python-app
```

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