SideCarCLI-send arguments to interceptors

Summary links SideCarCLI

No	Name + Link
1	Description
2	Specifications
3	Refactor specifications and code
4	Create Release
5	Finish interceptors
6	Send part of command to interceptors
7	Line Interceptors
8	Finish process after some time
9	Documetation Diagram
10	Technical Summary
11	Create dotnet tool

( Description : SideCar for CLI applications. Interceptors for Line, Finish, Timer . See Code )

For the SideCarCLI I want the interceptors ( line, finish , timer) to receive parts of the command line of the original application. But how to parse the command line and how to pass to the interceptors ?  RegEx to the rescue!

I will let the user define the command line of the starting application and parse the command line with his own regex.

For example , if he put as arguments

x=y z=t

a possible regex  will be

(?<FirstArg>\w+)=((\w+)) (?<LastArg>\w+)=((\w+))

Also, if the starting application is ping.exe and the command line is

-n 20 \”www.yahoo.com\”

then a possible regex to have the site is

(?<FirstArg>.+) (?<site>.+)

Then , in the interceptors , I will put

“LineInterceptors”: [
{
“Name”: “WindowsStandardWindowsOutputInterceptor”,
“Arguments”: “/c echo \”{site} {line}\””,
“FullPath”: “cmd.exe”,
“FolderToExecute”: null,
“InterceptOutput”: true
}

and  will replace the

  “Arguments”: “/c echo \”{site} {line}\””,

with the

site

parsed from regex.

The code is pretty simple . As inputs, we have this.regEx for the regex and this.Arguments for the command line

var regex = new Regex(this.regEx);
var names = regex.
GetGroupNames().
Where(it => !int.TryParse(it, out var _)).
ToArray();

var matches = regex.Matches(this.Arguments);
if (matches.Count == 0)
throw new ArgumentException($” the regex {regEx} has no matches for {Arguments}”);

var m = matches.FirstOrDefault();
foreach(var g in names)
{
if (m.Groups[g].Success)
{
argsRegex[g]=m.Groups[g].Value;
}
else
{
throw new ArgumentException($”cannot find {g}  in regex {regEx} when parsing {Arguments}”);
}
}

That’s all! You can find code at https://github.com/ignatandrei/SideCarCLI

 

 

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