Add support for "npm run" scripts

src/commands.ps1

@@ -41,6 +41,7 @@ $cmds = @(
 	'repo',
 	'restart',
 	'root',
+	'run',
 	'run-script',
 	'search',
 	'set',

src/completions.ps1

@@ -1,7 +1,52 @@
 @('npm', 'npm.cmd') | ForEach-Object {
-	Register-ArgumentCompleter -Native -CommandName $_ -ScriptBlock {
+	Register-ArgumentCompleter -Native -CommandName $_ -ScriptBlock {		
 		param($wordToComplete, $commandAst, $cursorPosition)
 
+		# Search for a file "package.json" in the current directory or parent directories 
+		function Get-PackageJsonPath {
+			[string]$packageJsonPath=$pwd;
+			while ($packageJsonPath.Length -gt 0 -and -not (Test-Path "$packageJsonPath\package.json")) {
+				# No package.json found. Look in parent directory next
+				$packageJsonPath=Split-Path $packageJsonPath -Parent
+			}
+
+			return $packageJsonPath
+		}
+
+		function Get-PackageJsonScripts {
+			param (
+				[Parameter(Mandatory=$true, ValueFromPipeline=$true)]
+				[string] $packageJsonPath,
+				[string] $scriptFilter
+			)
+			if ($packageJsonPath.Length -gt 0) {
+				$packageJson="$packageJsonPath/package.json"
+				$packageJsonContent = Get-Content $packageJson | ConvertFrom-Json
+				# Do we have a "script" section?
+				if ($packageJsonContent.scripts -ne $null) {
+					$allScripts=$packageJsonContent.scripts | Get-Member -MemberType NoteProperty | where Name -like "$scriptFilter" | select -ExpandProperty Name
+					$result=$allScripts | ForEach-Object {
+						# return the script name and the script text. The script text is passed as tooltip later.
+						[tuple]::Create($_, $packageJsonContent.scripts.$_)
+					}
+
+					return $result
+				}
+			}
+
+			return @();
+		}
+
+		if ($commandAst -match "npm(.cmd)?\s+run(-script)?\s") {
+			$allScripts = Get-PackageJsonPath | Get-PackageJsonScripts -scriptFilter "$wordToComplete*"
+			$result=$allScripts | ForEach-Object {
+				# item1 is the script name, item2 is the script text (passed as tooltip)
+				[System.Management.Automation.CompletionResult]::new($_.item1, $_.item1, 'ParameterValue', $_.item2)
+			}
+
+			return $result;
+		}
+
 		. $PSScriptRoot\commands.ps1
 		$cmds |
 			Where-Object { $_ -like "$wordToComplete*" } |