8000 Use docopt.net to parse extensions generator CLI args by atifaziz · Pull Request #994 · morelinq/MoreLINQ · GitHub
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Use docopt.net to parse extensions generator CLI args #994

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Merged
merged 2 commits into from
Apr 2, 2023
Merged

Use docopt.net to parse extensions generator CLI args #994

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a8da27b
Use docopt.net to parse extensions generator args
atifaziz Apr 2, 2023
9083bda
Encapsulate help bin token replacement
atifaziz Apr 2, 2023
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1 change: 1 addition & 0 deletions bld/ExtensionsGenerator/MoreLinq.ExtensionsGenerator.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
<IsPackable>false</IsPackable>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="docopt.net" Version="0.8.1" />
<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" />
<PackageReference Include="System.Collections.Immutable" Version="7.0.0" />
</ItemGroup>
Expand Down
97 changes: 40 additions & 57 deletions bld/ExtensionsGenerator/Program.cs
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10000
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
using DocoptNet;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
Expand All @@ -35,8 +36,19 @@
try
#pragma warning restore CA1852 // Seal internal types
{
Run(args);
return 0;
var exitCode =
ProgramArguments.CreateParser()
.Parse(args)
.Match(args => { Run(args); return 0; }, _ => 1);

if (exitCode != 0)
{
Console.Error.WriteLine("Invalid argument or usage!");
Console.Error.WriteLine();
Console.Error.WriteLine(ProgramArguments.Help);
}

return exitCode;
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception e)
Expand All @@ -46,63 +58,18 @@
return 0xbad;
}

static void Run(IEnumerable<string> args)
static void Run(ProgramArguments args)
{
var dir = Directory.GetCurrentDirectory();

string? includePattern = null;
string? excludePattern = null;
var debug = false;
var usings = new List<string>();
var noClassLead = false;

using (var arg = args.GetEnumerator())
{
while (arg.MoveNext())
{
switch (arg.Current)
{
case "-i":
case "--include":
includePattern = Read(arg, MissingArgValue);
break;
case "-x":
case "--exclude":
excludePattern = Read(arg, MissingArgValue);
break;
case "-u":
case "--using":
usings.Add(Read(arg, MissingArgValue));
break;
case "--no-class-lead":
noClassLead = true;
break;
case "-d":
case "--debug":
debug = true;
break;
case "":
continue;
default:
dir = arg.Current[0] != '-'
? arg.Current
: throw new Exception("Invalid argument: " + arg.Current);
break;
}
}

static Exception MissingArgValue() =>
new InvalidOperationException("Missing argument value.");
}
var dir = args.ArgDir ?? Directory.GetCurrentDirectory();

static Func<string, bool>
PredicateFromPattern(string? pattern, bool @default) =>
string.IsNullOrEmpty(pattern)
? delegate { return @default; }
: new Func<string, bool>(new Regex(pattern).IsMatch);

var includePredicate = PredicateFromPattern(includePattern, true);
var excludePredicate = PredicateFromPattern(excludePattern, false);
var includePredicate = PredicateFromPattern(args.OptInclude, true);
var excludePredicate = PredicateFromPattern(args.OptExclude, false);

var thisAssemblyName = typeof(TypeKey).GetTypeInfo().Assembly.GetName();

Expand Down Expand Up @@ -198,7 +165,7 @@ from e in ms.Select((m, i) => (SourceOrder: i + 1, Method: m))

q = q.ToArray();

if (debug)
if (args.OptDebug)
{
var ms =
//
Expand Down Expand Up @@ -252,7 +219,7 @@ into e
};

var imports =
from ns in baseImports.Concat(usings)
from ns in baseImports.Concat(args.OptUsing)
select indent + $"using {ns};";

var classes =
Expand Down Expand Up @@ -290,7 +257,7 @@ select Argument(IdentifierName(p.Identifier)),
.WithSemicolonToken(ParseToken(";").WithTrailingTrivia(LineFeed))
}
into m
let classLead = !noClassLead
let classLead = !args.OptNoClassLead
? $$"""

/// <summary><c>{{m.Name}}</c> extension.</summary>
Expand Down Expand Up @@ -373,9 +340,6 @@ select Walk(te.Type))),
};
}

static T Read<T>(IEnumerator<T> e, Func<Exception> errorFactory) =>
e.MoveNext() ? e.Current : throw errorFactory();

//
// Logical type nodes designed to be structurally sortable based on:
//
Expand Down Expand Up @@ -478,3 +442,22 @@ protected override int CompareParameters(TypeKey other)
return base.CompareParameters(other);
}
}

[DocoptArguments(HelpConstName = nameof(HelpText))]
sealed partial class ProgramArguments
{
const string HelpText = """
Usage:
#BIN# [options] [-u NAMESPACE]... [DIR]

Options:
-i, --include REGEX Include files matching pattern.
-x, --exclude REGEX Exclude files matching pattern.
-u, --using NAMESPACE Additional using imports to add.
--no-class-lead Skip generating class lead.
-d, --debug Produce output for debugging.
""";

public static string Help =>
HelpText.Replace("#BIN#", Path.GetFileName(Environment.ProcessPath), StringComparison.Ordinal);
}
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