Posted in Editor, Powershell, Snippets, vscode

More Snippets but being Verbose

So this is another 101 level post. Most of my scripting has been for automation and I try to  debug enough that the code is ready to go. I have dabbled with Verbose messaging and normally it didn’t apply so I was easily distracted. I added a personal ToDo, learn to use this handy feature. Quick note, when I have written GUI’s for my scripts. Since they are written for other uses some messaging was in order to save me some helpdesk calls about it. In short I would add a StatusBar with text regions and I would basically add Verbose like messages there. Moving on…

TLDR; so guilty here as I started with If statements and check for Verbose and then change $VerbosePreference, write the message and then set the $VerbosePreference back to where it was. See, this is why I bailed. I also walked on kitten-shells around the write cmdlets with all of the back and forth about write-host and it killed kittens. Focused, let’s do this.

First step: remember the code you should always be adding to your Scripts and Functions

[CmdletBinding()]
Param ()

Again you should be preferencing your scripts and variables,  these  two lines of code make your code “Advanced”.

How does this help? Being an advanced Script or Function you immediately have access to “Common Parameters” and with that Verbose parameter is inherited. No let’s risk the ridicule and look at that Write-Verbose cmdlet.

BEGIN {
...
Write-Verbose -Message "Okay you are in the Begin block"
...
}

That was all it took. No need for If statements or sub-functions… just use that cmdlet.

Since the operator is running in Verbose mode I will be adding this line of code I will be adding this very often. I ran a few test runs and I wanted to include the Lifecycle Block the message is coming from so I started to format the message with [BlockName]Message text. like:

BEGIN {
...
Write-Verbose -Message "[BEGIN]Okay you are in the Begin block"
...
}

Admittedly I have seen this on petri and just saw it as a great practice. Lots of manual typing right. How do  we make that easier? 3.2.1 Snippets!!!!

I added the following to my PowerShell.json file:

<div>
<div>        // Adds verbose messaging in the BEGIN block</div>
<div>        "Add Verbose in Begin block": {</div>
<div>            "prefix": "verbBEGIN",</div>
<div>            "body": ["Write-Verbose -Message \"[BEGIN]${1:Message}\""],</div>
<div>            "description": "Add verbose messaging for activity in the BEGIN block"</div>
<div>        },</div>
<div>        // Adds verbose messaging in the PROCESS block</div>
<div>        "Add Verbose in Process block": {</div>
<div>            "prefix": "verbPROCESS",</div>
<div>            "body": ["Write-Verbose -Message \"[ROCESS]${1:Message}\""],</div>
<div>            "description": "Add verbose messaging for activity in the PROCESS block"</div>
<div>        },</div>
<div>        // Adds verbose messaging in the END block</div>
<div>        "Add Verbose in END": {</div>
<div>            "prefix": "verbEND",</div>
<div>            "body": ["Write-Verbose -Message \"[END]${1:Message}\""],</div>
<div>            "description": "Add verbose messaging for activity in the END section"</div>
<div>        }</div>
</div>

So while in VSCode, working on some code I can type verb and I will see the snippets for each LifeCycle Block. I select the appropriate one, the snippet text is inserted into the code and the message that follows the Block name is highlighted for editing and press tab and I am done.

Something like this:

VSCode - Verbose Message

 

Posted in Editor, Powershell, Snippets, vscode

Easy Snippet – Small Tweaks

[These are pretty much 101 level posts]

Still distracted obviously, while on a conference call I was grazing through my VSCode PowerShell snippet file. I came across probably the most basic snippet and noticed it was not only lacking but missing some snippet magic:

        “Function”: {
            “prefix”: “func”,
            “body”: [
                “function $1() {“,
                “\t$0”,
                “}”
            ],
            “description”: “Function”
        },

Look at that mess. What is wrong?:

  1. When used it pastes the function shell but missing the closing curly bracket
  2. The $1() does nothing useful and we know the name of the function should be there.
  3. The $0 was right but again with no closing curly bracket why

So ashamed of myself, okay not really but a chance to improve with what I have learned

The revised version:

“Function”: {
            “prefix”: “func”,
            “body”: [
                “function $FunctionName {“,
                “\t$0# Code goes here\r”,
                “\\}”
            ],
            “description”: “Function”
        },
So what I have now performs the following when I call the Snippet now:
  1. Creates a basic function shell.
  2. The FunctionName term is highlighted first, so you enter the function name before beginning which just seems right.
  3. Once we give the function a name (Verb-Noun of course) we press Tab and we can start replacing “# Code goes here” with the contents of the function.
  4. The closing bracket is there and inline.

This is what it looks like in use.

Code_2018-04-26_16-29-48

 

 

 

Now to go back and fix up my other half-baked snippets and watch to see if I can discover new tricks as the community posts their snippets.

Posted in Editor, Powershell, Snippets, vscode

Distraction for Today – Snippets for VSCode

Current project for the PowerShell VSCode project is opening the Snippets up to the community and for the community. The was announced in the VSCode channel in the Slack group, a resource I strongly recommend.

I have taken the great base snippet file Keith Hill provided in the early days of using VSCode as my PowerShell editor and converted my ISE snippets from the XML file. I can’t complain as I had a useful collection of code snippets for ISE but looking at the format and capabilities that VSCode provided, I quickly started adding my snippets to the base collection Keith Hill provided.

I have one that I like to include in my End statement of a script. As it stood it was usable but was lacking. Watching the community post snippets I saw a chance to take this little nugget and make it better. The code simply starts a remove-variable so I can clean up variables before the script finishes and  then initiate a garbage collection via .Net. Below is what the snippet looked like when I used in my code:

 END {
    Remove-Variable -Name varA, varB, anotherVar
    [System.GC]::Collect()
}

I call the snippet and the code is added, including the tabs and carriage returns. The text area after the Name parameter is where the cursor goes because of  ${1:variablestoberemoved} but that is far as the Snippet automation would go. So I created an empty JSON file and started with the snippet as I had entered it. Then I progressed with fixing and adding some pieces to the snippet. I would then take the new version of just that snippet and replaced the one in the PowerShell.json file, then in a blank script file I would use the prefix and check the progress.

// Original
“Initiate Garbage Collection – Original”: {
            “prefix”: “freememory”,
            “body”:[
                “Remove-Variable -Name \\$variablestoberemoved\r”,
                “[System.GC]::Collect()\r”
            ],
            “description”: “Free up memory when script completes”
    },
    // Now let’s write that with a “tabable”
    “Initiate Garbage Collection – Next”: {
            “prefix”: “freememory”,
            “body”:[
                “Remove-Variable -Name \\${1:variablestoberemoved}\r”,
                “[System.GC]::Collect()\r”
            ],
            “description”: “Free up memory when script completes”
    // That sort of worked but after I enter the variables I want to table
    // tap out of the code because this is done
    },
    // What I finally came up with
    “Initiate Garbage Collection”: {
        “prefix”: “freememory”,
        “body”:[
            “Remove-Variable -Name ${1:variablestoberemoved}\r”,
            “[System.GC]::Collect()\r”,
            “$0”
        ],
        “description”: “Free up memory when script completes”
    }
}
So through the progression testing, I can call the snippet, it will take me to the “variablestoberemoved” enter the variables, comma seperated, that I know will still exist, then I can hit tab will take me to the line after my snippet text. Looks like:
2018-04-26_09-23-33
Quick use of a PowerShell snippet in Visual Studio Code