(#5) Migrate core extension to repository

src/chocolatey-core.extension/CHANGELOG.md

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+# CHANGELOG
+
+## 1.3.5
+
+- Bugfix `Remove-Process`: Fixed Powershell v2 compatibility issue
+
+## 1.3.4
+
+- Added `Remove-Process` function to ensure that process is stopped in reliable way
+
+## 1.3.3
+
+- Bugfix `Get-AppInstallLocation`: fix path is directory
+
+## 1.3.2
+
+- Bugfix `Get-AppInstallLocation`: now checks if path is directory
+
+## 1.3.1
+- Bugfix in `Get-AppInstallLocation`: Removed extra `$location` parameter from Split-Path when parsing the registry UninstallString.
+
+## 1.3.0
+
+- `Get-EffectiveProxy`: Get the current proxy using several methods
+
+## 1.2.0
+
+- Use `$IgnoredArguments` in all functions to allow for future expansion and splatting ([#621](https://github.com/chocolatey/chocolatey-coreteampackages/issues/621))
+- Bugfix in `Get-PackageParameters` parsing of paths containing symbol chars.
+
+## 1.1.0
+- `Get-AvailableDriveLetter`: Get the next unused drive letter
+
+## 1.0.7
+- Bugfix in `Get-PackageParameters`: flags can now have numbers in their names, whereas before, everything past the number would be truncated and the flag would turn into a boolean.
+
+## 1.0.6
+- Bugfix in `Get-AppInstallLocation`: Powershell 2 can not replace on null value.
+
+## 1.0.5
+
+- Bugfix in `Get-UninstallRegistryKey`: Powershell 2 compatibility.
+- Slightly improved documentation of `Get-UninstallRegistryKey`.
+
+## 1.0.4
+
+- Bugfix in `Get-PackageParameters`: Powershell 2 bug workaround ([#465](https://github.com/chocolatey/chocolatey-coreteampackages/issues/465)).
+
+## 1.0.3
+
+- Bugfix in `Get-PackageParameters`: error when parsing of path.
+
+## 1.0.2
+
+- Bugfix in `Get-PackageParameters`: PowerShell 2 compatibility.
+
+## 1.0.1
+
+- Bugfix in `Get-PackageParameters`: unaliased `sls` to work on PowerShell 2.
+
+## 1.0
+
+- Merged `mm-choco.extension`.
+- Merged `chocolatey-uninstall.extension`.
+- Added `Get-PackageCacheLocation`
+- Added `CHANGELOG.md` and `README.md`.
+- Refactoring and more documentation.
+
+## 0.1.3
+
+- `Get-WebContent`:  Download file with choco internals.

src/chocolatey-core.extension/README.md

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+# chocolatey-core.extension
+
+This is the Powershell module that extends Chocolatey with new functions.
+
+## Installation
+
+Install via chocolatey: `choco install chocolatey-core.extension`.
+
+The module is usually automatically installed as a dependency.
+
+## Usage
+
+To create a package that uses an extension function add the following to the `nuspec` specification:
+
+    <dependencies>
+        <dependency id="chocolatey-core.extension" version="SPECIFY_LATEST_VERSION" />
+    </dependencies>
+
+**NOTE**: Make sure you use adequate _minimum_ version.
+
+To test the functions you can import the module directly or via the `chocolateyInstaller.psm1` module:
+
+    PS> import-module $Env:ChocolateyInstall\helpers\chocolateyInstaller.psm1
+    PS> import-module $Env:ChocolateyInstall\extensions\chocolatey-core\*.psm1
+
+You can now test any of the functions:
+
+    PS>  Get-AppInstallLocation choco -Verbose
+
+    VERBOSE: Trying local and machine (x32 & x64) Uninstall keys
+    VERBOSE: Trying Program Files with 2 levels depth
+    VERBOSE: Trying PATH
+    C:\ProgramData\chocolatey\bin
+
+Keep in mind that function may work only in the context of the `chocolateyInstaller.ps1`.
+
+To get the list of functions, load the module directly and invoke the following command:
+
+    Get-Command -Module chocolatey-core
+
+To get the help for the specific function use `man`:
+
+    man Get-UninstallRegistryKey
+
+
+## Notes
+
+- There is [a known bug](https://github.com/chocolatey-community/chocolatey-coreteampackages/issues/784) in the function `Get-AppInstallLocation` with parameter `$AppNamePattern` which is internally used both as wildcard and regex patterns. This usually doesn't create any problems, but may do so if application contains regex symbols in the name, such as [notepad++](https://github.com/chocolatey-community/chocolatey-coreteampackages/issues/1198).
+
+

src/chocolatey-core.extension/chocolatey-core.extension.nuspec

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Do not remove this test for UTF-8: if “Ω” doesn’t appear as greek uppercase omega letter enclosed in quotation marks, you should use an editor that supports UTF-8, not this one. -->
+<package xmlns="http://schemas.microsoft.com/packaging/2015/06/nuspec.xsd">
+  <metadata>
+    <id>chocolatey-core.extension</id>
+    <version>1.3.5.1</version>
+    <title>Chocolatey Core Extensions</title>
+    <summary>Helper functions extending core choco functionality</summary>
+    <authors>chocolatey</authors>
+    <owners>chocolatey-community</owners>
+    <description>
+This package provides helper functions installed as a Chocolatey extension.
+These functions may be used in Chocolatey install/uninstall scripts by declaring this package a dependency in your package's nuspec.
+    </description>
+    <tags>chocolatey core extension admin</tags>
+    <projectUrl>https://github.com/chocolatey/chocolatey-coreteampackages</projectUrl>
+    <!--<iconUrl>http://cdn.rawgit.com/chocolatey-coreteampackages/master/icons/chocolatey-common.extension.png</iconUrl>-->
+    <copyright>© 2016 Chocolatey Core Team Package Contributors</copyright>
+    <licenseUrl>https://github.com/chocolatey/chocolatey-coreteampackages/blob/master/LICENSE.md</licenseUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <projectSourceUrl>https://github.com/chocolatey/chocolatey-coreteampackages</projectSourceUrl>
+    <packageSourceUrl>https://github.com/chocolatey/chocolatey-coreteampackages/tree/master/extensions/chocolatey-core.extension</packageSourceUrl>
+    <docsUrl>https://github.com/chocolatey/chocolatey-coreteampackages/tree/master/extensions/chocolatey-core.extension/README.md</docsUrl>
+    <bugTrackerUrl>https://github.com/chocolatey/chocolatey-coreteampackages/issues</bugTrackerUrl>
+    <releaseNotes>https://github.com/chocolatey/chocolatey-coreteampackages/tree/master/extensions/chocolatey-core.extension/CHANGELOG.md</releaseNotes>
+    </metadata>
+    <files>
+    <file src="extensions\**" target="extensions" />
+  </files>
+</package>

src/chocolatey-core.extension/extensions/Get-AppInstallLocation.ps1

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+. "$PSScriptRoot\Get-UninstallRegistryKey.ps1"
+<#
+.SYNOPSIS
+    Get application install location
+
+.DESCRIPTION
+    Function tries to find install location in multiple places. It returns $null if all fail. The following
+    locations are tried:
+      - local and machine (x32 & x64) various Uninstall keys
+      - x32 & x64 Program Files up to the 2nd level of depth
+      - native commands available via PATH
+      - locale and machine registry key SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths
+
+    Use Verbose parameter to see which of the above locations was used for the result, if any.
+
+.EXAMPLE
+    PS> Get-AppInstallLocation choco
+
+    Returns the install location of the application 'choco'.
+
+.OUTPUTS
+    [String] or $null
+#>
+function Get-AppInstallLocation {
+    [CmdletBinding()]
+    param(
+        # Regular expression pattern
+        [ValidateNotNullOrEmpty()]
+        [string] $AppNamePattern,
+
+        # Allows splatting with arguments that do not apply and future expansion. Do not use directly.
+        [parameter(ValueFromRemainingArguments = $true)]
+        [Object[]] $IgnoredArguments
+    )
+
+    function strip($path) { if ($path.EndsWith('\')) { return $path -replace '.$' } else { $path } }
+
+    function is_dir( $path ) { $path -and (gi $path -ea 0).PsIsContainer -eq $true }
+
+    $ErrorActionPreference = "SilentlyContinue"
+
+    Write-Verbose "Trying local and machine (x32 & x64) Uninstall keys"
+    [array] $key = Get-UninstallRegistryKey $AppNamePattern
+    if ($key.Count -eq 1) {
+        Write-Verbose "Trying Uninstall key property 'InstallLocation'"
+        $location = $key.InstallLocation
+        if (is_dir $location) { return strip $location }
+
+        Write-Verbose "Trying Uninstall key property 'UninstallString'"
+        $location = $key.UninstallString
+        if ($location) { $location = $location.Replace('"', '') | Split-Path }
+        if (is_dir $location) { return strip $location }
+
+        Write-Verbose "Trying Uninstall key property 'DisplayIcon'"
+        $location = $key.DisplayIcon
+        if ($location) { $location = Split-Path $location }
+        if (is_dir $location) { return strip $location }
+    } else { Write-Verbose "Found $($key.Count) keys, aborting this method" }
+
+    $dirs = $Env:ProgramFiles, "$Env:ProgramFiles\*\*"
+    if (Get-ProcessorBits 64) { $dirs += ${ENV:ProgramFiles(x86)}, "${ENV:ProgramFiles(x86)}\*\*" }
+    Write-Verbose "Trying Program Files with 2 levels depth: $dirs"
+    $location = (ls $dirs | ? {$_.PsIsContainer}) -match $AppNamePattern | select -First 1 | % {$_.FullName}
+    if (is_dir $location) { return strip $location }
+
+    Write-Verbose "Trying native commands on PATH"
+    $location = (Get-Command -CommandType Application) -match $AppNamePattern | select -First 1 | % { Split-Path $_.Source }
+    if (is_dir $location) { return strip $location }
+
+    $appPaths =  "\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths"
+    Write-Verbose "Trying Registry: $appPaths"
+    $location = (ls "HKCU:\$appPaths", "HKLM:\$appPaths") -match $AppNamePattern | select -First 1
+    if ($location) { $location = Split-Path $location }
+    if (is_dir $location) { return strip $location }
+
+    Write-Verbose "No location found"
+}

src/chocolatey-core.extension/extensions/Get-AvailableDriveLetter.ps1

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+<#
+.SYNOPSIS
+  Get a 'free' drive letter
+
+.DESCRIPTION
+  Get a not yet in-use drive letter that can be used for mounting
+
+.EXAMPLE
+  Get-AvailableDriveLetter
+
+.EXAMPLE
+  Get-AvailableDriveLetter 'X'
+  (do not return X, even if it'd be the next choice)
+
+.INPUTS
+  specific drive letter(s) that will be excluded as potential candidates
+
+.OUTPUTS
+  System.String (single drive-letter character)
+
+.LINK
+  http://stackoverflow.com/questions/12488030/getting-a-free-drive-letter/29373301#29373301
+#>
+function Get-AvailableDriveLetter {
+  param (
+    [char[]]$ExcludedLetters,
+
+    # Allows splatting with arguments that do not apply and future expansion. Do not use directly.
+    [parameter(ValueFromRemainingArguments = $true)]
+    [Object[]] $IgnoredArguments
+  )
+
+  $Letter = [int][char]'C'
+  $i = @()
+
+  #getting all the used Drive letters reported by the Operating System
+  $(Get-PSDrive -PSProvider filesystem) | %{$i += $_.name}
+
+  #Adding the excluded letter
+  $i+=$ExcludedLetters
+
+  while($i -contains $([char]$Letter)){$Letter++}
+
+  if ($Letter -gt [char]'Z') {
+    throw "error: no drive letter available!"
+  }
+  Write-Verbose "available drive letter: '$([char]$Letter)'"
+  Return $([char]$Letter)
+}
+

src/chocolatey-core.extension/extensions/Get-EffectiveProxy.ps1

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+<#
+.SYNOPSIS
+    Get the current proxy using several methods
+
+.DESCRIPTION
+    Function tries to find the current proxy using several methods, in the given order:
+        - $env:chocolateyProxyLocation variable
+        - $env:http_proxy environment variable
+        - IE proxy
+        - Chocolatey config
+        - Winhttp proxy
+        - WebClient proxy
+
+    Use Verbose parameter to see which of the above locations was used for the result, if any.
+    The function currently doesn't handle the proxy username and password.
+
+.OUTPUTS
+    [String] in the form of http://<proxy>:<port>
+#>
+function Get-EffectiveProxy(){
+
+    # Try chocolatey proxy environment vars
+    if ($env:chocolateyProxyLocation) {
+        Write-Verbose "Using `$Env:chocolateyProxyLocation"
+        return $env:chocolateyProxyLocation
+    }
+
+    # Try standard Linux variable
+    if ($env:http_proxy) {
+        Write-Verbose "Using `$Env:http_proxy"
+        return $env:http_proxy
+    }
+
+    # Try to get IE proxy
+    $key = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
+    $r = Get-ItemProperty $key
+    if ($r.ProxyEnable -and $r.ProxyServer) {
+        Write-Verbose "Using IE proxy settings"
+        return "http://" + $r.ProxyServer
+    }
+
+    # Try chocolatey config file
+    [xml] $cfg = gc $env:ChocolateyInstall\config\chocolatey.config
+    $p = $cfg.chocolatey.config | % { $_.add } | ? { $_.key -eq 'proxy' } | select -Expand value
+    if ($p) {
+        Write-Verbose "Using choco config proxy"
+        return $p
+    }
+
+    # Try winhttp proxy
+    (netsh.exe winhttp show proxy) -match 'Proxy Server\(s\)' | set proxy 
+    $proxy = $proxy -split ' :' | select -Last 1
+    $proxy = $proxy.Trim()
+    if ($proxy) {
+        Write-Verbose "Using winhttp proxy server"
+        return "http://" + $proxy
+    }
+
+    # Try using WebClient
+    $url = "http://chocolatey.org"
+    $client = New-Object System.Net.WebClient
+    if ($client.Proxy.IsBypassed($url)) { return $null }
+
+    Write-Verbose "Using WebClient proxy"
+    return "http://" + $client.Proxy.GetProxy($url).Authority
+}

src/chocolatey-core.extension/extensions/Get-PackageCacheLocation.ps1

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+<#
+.SYNOPSIS
+    Get temporary location for the package based on its name and version.
+
+.DESCRIPTION
+    The function returns package cache directory within $Env:TEMP. It will not create the directory
+    if it doesn't exist.
+
+    This function is useful when you have to obtain the file using `Get-ChocolateyWebFile` in order
+    to perform certain installation steps that other helpers can't do.
+
+.EXAMPLE
+    Get-PackageCacheLocation
+
+.OUTPUTS
+    [String]
+
+.LINKS
+    Get-ChocolateyWebFile
+#>
+function Get-PackageCacheLocation {
+    [CmdletBinding()]
+    param (
+        # Name of the package, by default $Env:ChocolateyPackageName
+        [string] $Name    = $Env:ChocolateyPackageName,
+        # Version of the package, by default $Env:ChocolateyPackageVersion
+        [string] $Version = $Env:ChocolateyPackageVersion,
+        # Allows splatting with arguments that do not apply and future expansion. Do not use directly.
+        [parameter(ValueFromRemainingArguments = $true)]
+        [Object[]] $IgnoredArguments
+    )
+
+    if (!$Name) { Write-Warning 'Environment variable $Env:ChocolateyPackageName is not set' }
+    $res = Join-Path $Env:TEMP $Name
+
+    if (!$Version) { Write-Warning 'Environment variable $Env:ChocolateyPackageVersion is not set' }
+    $res = Join-Path $res $Version
+
+    $res
+}