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HelpProvider.cs
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HelpProvider.cs
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namespace Spectre.Console.Cli.Help;
/// <summary>
/// The help provider for Spectre.Console.
/// </summary>
/// <remarks>
/// Other IHelpProvider implementations can be injected into the CommandApp, if desired.
/// </remarks>
public class HelpProvider : IHelpProvider
{
private readonly HelpProviderResources resources;
private readonly HelpProviderStyle? helpStyles;
/// <summary>
/// Gets a value indicating how many examples from direct children to show in the help text.
/// </summary>
protected virtual int MaximumIndirectExamples { get; }
/// <summary>
/// Gets a value indicating whether any default values for command options are shown in the help text.
/// </summary>
protected virtual bool ShowOptionDefaultValues { get; }
/// <summary>
/// Gets a value indicating whether a trailing period of a command description is trimmed in the help text.
/// </summary>
protected virtual bool TrimTrailingPeriod { get; }
/// <summary>
/// Gets a value indicating whether to emit the markup styles, inline, when rendering the help text.
/// </summary>
/// <remarks>
/// Useful for unit testing different styling of the same help text.
/// </remarks>
protected virtual bool RenderMarkupInline { get; } = false;
private sealed class HelpArgument
{
public string Name { get; }
public int Position { get; set; }
public bool Required { get; }
public string? Description { get; }
private HelpArgument(string name, int position, bool required, string? description)
{
Name = name;
Position = position;
Required = required;
Description = description;
}
public static IReadOnlyList<HelpArgument> Get(ICommandInfo? command)
{
var arguments = new List<HelpArgument>();
arguments.AddRange(command?.Parameters?.OfType<ICommandArgument>()?.Select(
x => new HelpArgument(x.Value, x.Position, x.Required, x.Description))
?? Array.Empty<HelpArgument>());
return arguments;
}
}
private sealed class HelpOption
{
public string? Short { get; }
public string? Long { get; }
public string? Value { get; }
public bool? ValueIsOptional { get; }
public string? Description { get; }
public object? DefaultValue { get; }
private HelpOption(string? @short, string? @long, string? @value, bool? valueIsOptional, string? description, object? defaultValue)
{
Short = @short;
Long = @long;
Value = value;
ValueIsOptional = valueIsOptional;
Description = description;
DefaultValue = defaultValue;
}
public static IReadOnlyList<HelpOption> Get(
ICommandModel model,
ICommandInfo? command,
HelpProviderResources resources)
{
var parameters = new List<HelpOption>
{
new HelpOption("h", "help", null, null, resources.PrintHelpDescription, null),
};
// Version information applies to the entire application
// Include the "-v" option in the help when at the root of the command line application
// Don't allow the "-v" option if users have specified one or more sub-commands
if ((command?.Parent == null) && !(command?.IsBranch ?? false))
{
// Only show the version command if there is an
// application version set.
if (model.ApplicationVersion != null)
{
parameters.Add(new HelpOption("v", "version", null, null, resources.PrintVersionDescription, null));
}
}
parameters.AddRange(command?.Parameters.OfType<ICommandOption>().Where(o => !o.IsHidden).Select(o =>
new HelpOption(
o.ShortNames.FirstOrDefault(), o.LongNames.FirstOrDefault(),
o.ValueName, o.ValueIsOptional, o.Description,
o.IsFlag && o.DefaultValue?.Value is false ? null : o.DefaultValue?.Value))
?? Array.Empty<HelpOption>());
return parameters;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="HelpProvider"/> class.
/// </summary>
/// <param name="settings">The command line application settings used for configuration.</param>
public HelpProvider(ICommandAppSettings settings)
{
this.ShowOptionDefaultValues = settings.ShowOptionDefaultValues;
this.MaximumIndirectExamples = settings.MaximumIndirectExamples;
this.TrimTrailingPeriod = settings.TrimTrailingPeriod;
// Don't provide a default style if HelpProviderStyles is null,
// as the user will have explicitly done this to output unstyled help text
this.helpStyles = settings.HelpProviderStyles;
resources = new HelpProviderResources(settings.Culture);
}
/// <inheritdoc/>
public virtual IEnumerable<IRenderable> Write(ICommandModel model, ICommandInfo? command)
{
var result = new List<IRenderable>();
result.AddRange(GetHeader(model, command));
result.AddRange(GetDescription(model, command));
result.AddRange(GetUsage(model, command));
result.AddRange(GetExamples(model, command));
result.AddRange(GetArguments(model, command));
result.AddRange(GetOptions(model, command));
result.AddRange(GetCommands(model, command));
result.AddRange(GetFooter(model, command));
return result;
}
/// <summary>
/// Gets the header for the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetHeader(ICommandModel model, ICommandInfo? command)
{
yield break;
}
/// <summary>
/// Gets the description section of the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetDescription(ICommandModel model, ICommandInfo? command)
{
if (command?.Description == null)
{
yield break;
}
var composer = NewComposer();
composer.Style(helpStyles?.Description?.Header ?? Style.Plain, $"{resources.Description}:").LineBreak();
composer.Text(command.Description).LineBreak();
yield return composer.LineBreak();
}
/// <summary>
/// Gets the usage section of the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetUsage(ICommandModel model, ICommandInfo? command)
{
var composer = NewComposer();
composer.Style(helpStyles?.Usage?.Header ?? Style.Plain, $"{resources.Usage}:").LineBreak();
composer.Tab().Text(model.ApplicationName);
var parameters = new List<Composer>();
if (command == null)
{
parameters.Add(NewComposer().Style(helpStyles?.Usage?.Options ?? Style.Plain, $"[{resources.Options}]"));
parameters.Add(NewComposer().Style(helpStyles?.Usage?.Command ?? Style.Plain, $"<{resources.Command}>"));
}
else
{
foreach (var current in command.Flatten())
{
var isCurrent = current == command;
if (!current.IsDefaultCommand)
{
if (isCurrent)
{
parameters.Add(NewComposer().Style(helpStyles?.Usage?.CurrentCommand ?? Style.Plain, $"{current.Name}"));
}
else
{
parameters.Add(NewComposer().Text(current.Name));
}
}
if (current.Parameters.OfType<ICommandArgument>().Any())
{
if (isCurrent)
{
foreach (var argument in current.Parameters.OfType<ICommandArgument>()
.Where(a => a.Required).OrderBy(a => a.Position).ToArray())
{
parameters.Add(NewComposer().Style(helpStyles?.Usage?.RequiredArgument ?? Style.Plain, $"<{argument.Value}>"));
}
}
var optionalArguments = current.Parameters.OfType<ICommandArgument>().Where(x => !x.Required).ToArray();
if (optionalArguments.Length > 0 || !isCurrent)
{
foreach (var optionalArgument in optionalArguments)
{
parameters.Add(NewComposer().Style(helpStyles?.Usage?.OptionalArgument ?? Style.Plain, $"[{optionalArgument.Value}]"));
}
}
}
if (isCurrent)
{
parameters.Add(NewComposer().Style(helpStyles?.Usage?.Options ?? Style.Plain, $"[{resources.Options}]"));
}
}
if (command.IsBranch && command.DefaultCommand == null)
{
// The user must specify the command
parameters.Add(NewComposer().Style(helpStyles?.Usage?.Command ?? Style.Plain, $"<{resources.Command}>"));
}
else if (command.IsBranch && command.DefaultCommand != null && command.Commands.Count > 0)
{
// We are on a branch with a default command
// The user can optionally specify the command
parameters.Add(NewComposer().Style(helpStyles?.Usage?.Command ?? Style.Plain, $"[{resources.Command}]"));
}
else if (command.IsDefaultCommand)
{
var commands = model.Commands.Where(x => !x.IsHidden && !x.IsDefaultCommand).ToList();
if (commands.Count > 0)
{
// Commands other than the default are present
// So make these optional in the usage statement
parameters.Add(NewComposer().Style(helpStyles?.Usage?.Command ?? Style.Plain, $"[{resources.Command}]"));
}
}
}
composer.Join(" ", parameters);
composer.LineBreak();
return new[] { composer };
}
/// <summary>
/// Gets the examples section of the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
/// <remarks>
/// Examples from the command's direct children are used
/// if no examples have been set on the specified command or model.
/// </remarks>
public virtual IEnumerable<IRenderable> GetExamples(ICommandModel model, ICommandInfo? command)
{
var maxExamples = int.MaxValue;
var examples = command?.Examples?.ToList() ?? model.Examples?.ToList() ?? new List<string[]>();
if (examples.Count == 0)
{
// Since we're not checking direct examples,
// make sure that we limit the number of examples.
maxExamples = MaximumIndirectExamples;
// Start at the current command (if exists)
// or alternatively commence at the model.
var commandContainer = command ?? (ICommandContainer)model;
var queue = new Queue<ICommandContainer>(new[] { commandContainer });
// Traverse the command tree and look for examples.
// As soon as a node contains commands, bail.
while (queue.Count > 0)
{
var current = queue.Dequeue();
foreach (var child in current.Commands.Where(x => !x.IsHidden))
{
if (child.Examples.Count > 0)
{
examples.AddRange(child.Examples);
}
queue.Enqueue(child);
}
if (examples.Count >= maxExamples)
{
break;
}
}
}
if (Math.Min(maxExamples, examples.Count) > 0)
{
var composer = NewComposer();
composer.LineBreak();
composer.Style(helpStyles?.Examples?.Header ?? Style.Plain, $"{resources.Examples}:").LineBreak();
for (var index = 0; index < Math.Min(maxExamples, examples.Count); index++)
{
var args = string.Join(" ", examples[index]);
composer.Tab().Text(model.ApplicationName).Space().Style(helpStyles?.Examples?.Arguments ?? Style.Plain, args);
composer.LineBreak();
}
return new[] { composer };
}
return Array.Empty<IRenderable>();
}
/// <summary>
/// Gets the arguments section of the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetArguments(ICommandModel model, ICommandInfo? command)
{
var arguments = HelpArgument.Get(command);
if (arguments.Count == 0)
{
return Array.Empty<IRenderable>();
}
var result = new List<IRenderable>
{
NewComposer().LineBreak().Style(helpStyles?.Arguments?.Header ?? Style.Plain, $"{resources.Arguments}:").LineBreak(),
};
var grid = new Grid();
grid.AddColumn(new GridColumn { Padding = new Padding(4, 4), NoWrap = true });
grid.AddColumn(new GridColumn { Padding = new Padding(0, 0) });
foreach (var argument in arguments.Where(x => x.Required).OrderBy(x => x.Position))
{
grid.AddRow(
NewComposer().Style(helpStyles?.Arguments?.RequiredArgument ?? Style.Plain, $"<{argument.Name}>"),
NewComposer().Text(argument.Description?.TrimEnd('.') ?? " "));
}
foreach (var argument in arguments.Where(x => !x.Required).OrderBy(x => x.Position))
{
grid.AddRow(
NewComposer().Style(helpStyles?.Arguments?.OptionalArgument ?? Style.Plain, $"[{argument.Name}]"),
NewComposer().Text(argument.Description?.TrimEnd('.') ?? " "));
}
result.Add(grid);
return result;
}
/// <summary>
/// Gets the options section of the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetOptions(ICommandModel model, ICommandInfo? command)
{
// Collect all options into a single structure.
var parameters = HelpOption.Get(model, command, resources);
if (parameters.Count == 0)
{
return Array.Empty<IRenderable>();
}
var result = new List<IRenderable>
{
NewComposer().LineBreak().Style(helpStyles?.Options?.Header ?? Style.Plain, $"{resources.Options}:").LineBreak(),
};
var helpOptions = parameters.ToArray();
var defaultValueColumn = ShowOptionDefaultValues && helpOptions.Any(e => e.DefaultValue != null);
var grid = new Grid();
grid.AddColumn(new GridColumn { Padding = new Padding(4, 4), NoWrap = true });
if (defaultValueColumn)
{
grid.AddColumn(new GridColumn { Padding = new Padding(0, 0, 4, 0) });
}
grid.AddColumn(new GridColumn { Padding = new Padding(0, 0) });
if (defaultValueColumn)
{
grid.AddRow(
NewComposer().Space(),
NewComposer().Style(helpStyles?.Options?.DefaultValueHeader ?? Style.Plain, resources.Default),
NewComposer().Space());
}
foreach (var option in helpOptions)
{
var columns = new List<IRenderable>() { GetOptionParts(option) };
if (defaultValueColumn)
{
columns.Add(GetDefaultValueForOption(option.DefaultValue));
}
columns.Add(NewComposer().Text(option.Description?.TrimEnd('.') ?? " "));
grid.AddRow(columns.ToArray());
}
result.Add(grid);
return result;
}
/// <summary>
/// Gets the commands section of the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetCommands(ICommandModel model, ICommandInfo? command)
{
var commandContainer = command ?? (ICommandContainer)model;
bool isDefaultCommand = command?.IsDefaultCommand ?? false;
var commands = isDefaultCommand ? model.Commands : commandContainer.Commands;
commands = commands.Where(x => !x.IsHidden).ToList();
if (commands.Count == 0)
{
return Array.Empty<IRenderable>();
}
var result = new List<IRenderable>
{
NewComposer().LineBreak().Style(helpStyles?.Commands?.Header ?? Style.Plain, $"{resources.Commands}:").LineBreak(),
};
var grid = new Grid();
grid.AddColumn(new GridColumn { Padding = new Padding(4, 4), NoWrap = true });
grid.AddColumn(new GridColumn { Padding = new Padding(0, 0) });
foreach (var child in commands)
{
var arguments = NewComposer();
arguments.Style(helpStyles?.Commands?.ChildCommand ?? Style.Plain, child.Name);
arguments.Space();
foreach (var argument in HelpArgument.Get(child).Where(a => a.Required))
{
arguments.Style(helpStyles?.Commands?.RequiredArgument ?? Style.Plain, $"<{argument.Name}>");
arguments.Space();
}
if (TrimTrailingPeriod)
{
grid.AddRow(
NewComposer().Text(arguments.ToString().TrimEnd()),
NewComposer().Text(child.Description?.TrimEnd('.') ?? " "));
}
else
{
grid.AddRow(
NewComposer().Text(arguments.ToString().TrimEnd()),
NewComposer().Text(child.Description ?? " "));
}
}
result.Add(grid);
return result;
}
/// <summary>
/// Gets the footer for the help information.
/// </summary>
/// <param name="model">The command model to write help for.</param>
/// <param name="command">The command for which to write help information (optional).</param>
/// <returns>An enumerable collection of <see cref="IRenderable"/> objects.</returns>
public virtual IEnumerable<IRenderable> GetFooter(ICommandModel model, ICommandInfo? command)
{
yield break;
}
private Composer NewComposer()
{
return new Composer(RenderMarkupInline);
}
private IRenderable GetOptionParts(HelpOption option)
{
var composer = NewComposer();
if (option.Short != null)
{
composer.Text("-").Text(option.Short);
if (option.Long != null)
{
composer.Text(", ");
}
}
else
{
composer.Text(" ");
if (option.Long != null)
{
composer.Text(" ");
}
}
if (option.Long != null)
{
composer.Text("--").Text(option.Long);
}
if (option.Value != null)
{
composer.Text(" ");
if (option.ValueIsOptional ?? false)
{
composer.Style(helpStyles?.Options?.OptionalOption ?? Style.Plain, $"[{option.Value}]");
}
else
{
composer.Style(helpStyles?.Options?.RequiredOption ?? Style.Plain, $"<{option.Value}>");
}
}
return composer;
}
private Composer GetDefaultValueForOption(object? defaultValue)
{
return defaultValue switch
{
null => NewComposer().Text(" "),
"" => NewComposer().Text(" "),
Array { Length: 0 } => NewComposer().Text(" "),
Array array => NewComposer().Join(", ", array.Cast<object>().Select(o => NewComposer().Style(helpStyles?.Options?.DefaultValue ?? Style.Plain, o.ToString() ?? string.Empty))),
_ => NewComposer().Style(helpStyles?.Options?.DefaultValue ?? Style.Plain, defaultValue?.ToString() ?? string.Empty),
};
}
}