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<?php
namespace Stecman\Component\Symfony\Console\BashCompletion;
final class HookFactory
{
/**
* Hook scripts
*
* These are shell-specific scripts that pass required information from that shell's
* completion system to the interface of the completion command in this module.
*
* The following placeholders are replaced with their value at runtime:
*
* %%function_name%% - name of the generated shell function run for completion
* %%program_name%% - command name completion will be enabled for
* %%program_path%% - path to program the completion is for/generated by
* %%completion_command%% - command to be run to compute completions
*
* NOTE: Comments are stripped out by HookFactory::stripComments as eval reads
* input as a single line, causing it to break if comments are included.
* While comments work using `... | source /dev/stdin`, existing installations
* are likely using eval as it's been part of the instructions for a while.
*
* @var array
*/
protected static $hooks = array(
// BASH Hook
'bash' => <<<'END'
# BASH completion for %%program_path%%
function %%function_name%% {
# Copy BASH's completion variables to the ones the completion command expects
# These line up exactly as the library was originally designed for BASH
local CMDLINE_CONTENTS="$COMP_LINE"
local CMDLINE_CURSOR_INDEX="$COMP_POINT"
local CMDLINE_WORDBREAKS="$COMP_WORDBREAKS";
export CMDLINE_CONTENTS CMDLINE_CURSOR_INDEX CMDLINE_WORDBREAKS
local RESULT STATUS;
RESULT="$(%%completion_command%% </dev/null)";
STATUS=$?;
local cur mail_check_backup;
mail_check_backup=$MAILCHECK;
MAILCHECK=-1;
_get_comp_words_by_ref -n : cur;
# Check if shell provided path completion is requested
# @see Completion\ShellPathCompletion
if [ $STATUS -eq 200 ]; then
_filedir;
return 0;
# Bail out if PHP didn't exit cleanly
elif [ $STATUS -ne 0 ]; then
echo -e "$RESULT";
return $?;
fi;
COMPREPLY=(`compgen -W "$RESULT" -- $cur`);
__ltrim_colon_completions "$cur";
MAILCHECK=mail_check_backup;
};
if [ "$(type -t _get_comp_words_by_ref)" == "function" ]; then
complete -F %%function_name%% "%%program_name%%";
else
>&2 echo "Completion was not registered for %%program_name%%:";
>&2 echo "The 'bash-completion' package is required but doesn't appear to be installed.";
fi
END
// ZSH Hook
, 'zsh' => <<<'END'
# ZSH completion for %%program_path%%
function %%function_name%% {
local -x CMDLINE_CONTENTS="$words"
local -x CMDLINE_CURSOR_INDEX
(( CMDLINE_CURSOR_INDEX = ${#${(j. .)words[1,CURRENT]}} ))
local RESULT STATUS
RESULT=("${(@f)$( %%completion_command%% )}")
STATUS=$?;
# Check if shell provided path completion is requested
# @see Completion\ShellPathCompletion
if [ $STATUS -eq 200 ]; then
_path_files;
return 0;
# Bail out if PHP didn't exit cleanly
elif [ $STATUS -ne 0 ]; then
echo -e "$RESULT";
return $?;
fi;
compadd -- $RESULT
};
compdef %%function_name%% "%%program_name%%";
END
);
/**
* Return the names of shells that have hooks
*
* @return string[]
*/
public static function getShellTypes()
{
return array_keys(self::$hooks);
}
/**
* Return a completion hook for the specified shell type
*
* @param string $type - a key from self::$hooks
* @param string $programPath
* @param string $programName
* @param bool $multiple
*
* @return string
*/
public function generateHook($type, $programPath, $programName = null, $multiple = false)
{
if (!isset(self::$hooks[$type])) {
throw new \RuntimeException(sprintf(
"Cannot generate hook for unknown shell type '%s'. Available hooks are: %s",
$type,
implode(', ', self::getShellTypes())
));
}
// Use the program path if an alias/name is not given
$programName = $programName ?: $programPath;
if ($multiple) {
$completionCommand = '$1 _completion';
} else {
$completionCommand = $programPath . ' _completion';
}
return str_replace(
array(
'%%function_name%%',
'%%program_name%%',
'%%program_path%%',
'%%completion_command%%',
),
array(
$this->generateFunctionName($programPath, $programName),
$programName,
$programPath,
$completionCommand
),
$this->stripComments(self::$hooks[$type])
);
}
/**
* Generate a function name that is unlikely to conflict with other generated function names in the same shell
*/
protected function generateFunctionName($programPath, $programName)
{
return sprintf(
'_%s_%s_complete',
$this->sanitiseForFunctionName(basename($programName)),
substr(md5($programPath), 0, 16)
);
}
/**
* Make a string safe for use as a shell function name
*
* @param string $name
* @return string
*/
protected function sanitiseForFunctionName($name)
{
$name = str_replace('-', '_', $name);
return preg_replace('/[^A-Za-z0-9_]+/', '', $name);
}
/**
* Strip '#' style comments from a string
*
* BASH's eval doesn't work with comments as it removes line breaks, so comments have to be stripped out
* for this method of sourcing the hook to work. Eval seems to be the most reliable method of getting a
* hook into a shell, so while it would be nice to render comments, this stripping is required for now.
*
* @param string $script
* @return string
*/
protected function stripComments($script)
{
return preg_replace('/(^\s*\#.*$)/m', '', $script);
}
}