/// <summary>
/// For a given set of commands, extracts command names
/// that are similar to the provided expression in terms
/// of string distance.
/// </summary>
public static IEnumerable <string> SimilarNames(
this IEnumerable <Command> commands,
string expression,
int maximumEditDistance)
{
return(commands
.SelectMany(
command => PrototypeHelper
.GetComponents(command.Prototype)
.Select(name => new { Name = name, Distance = name.LevenshteinDistance(expression) })
.Where(pair => pair.Distance <= maximumEditDistance))
.OrderBy(pair => pair.Distance)
.Select(pair => pair.Name));
}
/// <summary>
/// Gets the actual name of a command line flag
/// provided by the user in the command line arguments.
/// </summary>
public string GetProvidedName(IEnumerable <string> commandLineArguments)
{
IEnumerable <string> flagNames = PrototypeHelper
.GetComponents(this.Prototype)
.SelectMany(flagName =>
new string[]
{
$"-{flagName}",
$"--{flagName}",
$"/{flagName}"
});
return(commandLineArguments.First(argument => flagNames.Contains(argument)));
}
/// <summary>
/// Returns a set of commands whose prototypes make a match
/// with the provided value.
/// </summary>
public static IEnumerable <Command> Matching(this IEnumerable <Command> commands, string expression)
{
IEnumerable <Command> strictMatches = commands.Where(
command => new Regex(command.Prototype).IsMatch(expression));
if (strictMatches.Any())
{
return(strictMatches);
}
IEnumerable <Command> prefixMatches = commands.Where(command =>
{
IEnumerable <string> commandComponents =
PrototypeHelper.GetComponents(command.Prototype);
return(commandComponents.Any(
component => component.StartsWith(
expression,
StringComparison.OrdinalIgnoreCase)));
});
return(prefixMatches);
}
