feat(windows): add install script for PowerShell

docs/docs/installation/windows.mdx

@@ -27,21 +27,35 @@ When using oh-my-posh inside the WSL, make sure to follow the [linux][linux] ins
   values={[
     { label: 'winget', value: 'winget', },
     { label: 'scoop', value: 'scoop', },
+    { label: 'manual', value: 'manual', },
   ]
 }>
 <TabItem value="winget">
 
+Open a PowerShell prompt and run the following command:
+
 ```powershell
 winget install JanDeDobbeleer.OhMyPosh
 ```
 
 </TabItem>
 <TabItem value="scoop">
 
+Open a PowerShell prompt and run the following command:
+
 ```powershell
 scoop install https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/oh-my-posh.json
 ```
 
+</TabItem>
+<TabItem value="manual">
+
+Open a PowerShell prompt and run the following command:
+
+```powershell
+Set-ExecutionPolicy Bypass -Scope Process -Force; Invoke-Expression ((New-Object System.Net.WebClient).DownloadString('https://ohmyposh.dev/install.ps1'))
+```
+
 </TabItem>
 </Tabs>
 
@@ -53,9 +67,9 @@ This installs a couple of things:
 For the `$PATH` to reload, a restart of your terminal is advised.
 
 :::warning Antivirus software
-Due to frequent updates of Oh My Posh, Antivirus software occasionally flags it (false positive).  
-To ensure Oh My Posh isn't blocked you can either report it to your favorite Antivirus software as false positive 
-(e.g. [Report a false positive/negative to Microsoft for analysis][report-false-positive]) or create an exclusion for it.  
+Due to frequent updates of Oh My Posh, Antivirus software occasionally flags it (false positive).
+To ensure Oh My Posh isn't blocked you can either report it to your favorite Antivirus software as false positive
+(e.g. [Report a false positive/negative to Microsoft for analysis][report-false-positive]) or create an exclusion for it.
 Exclusions should be added with the full path to the executable, you can get it with the following command from a PowerShell prompt:
 
 ```powershell
@@ -71,21 +85,35 @@ Exclusions should be added with the full path to the executable, you can get it
   values={[
     { label: 'winget', value: 'winget', },
     { label: 'scoop', value: 'scoop', },
+    { label: 'manual', value: 'manual', },
   ]
 }>
 <TabItem value="winget">
 
+Open a PowerShell prompt and run the following command:
+
 ```powershell
 winget upgrade JanDeDobbeleer.OhMyPosh
 ```
 
 </TabItem>
 <TabItem value="scoop">
 
+Open a PowerShell prompt and run the following command:
+
 ```powershell
 scoop update oh-my-posh
 ```
 
+</TabItem>
+<TabItem value="manual">
+
+Open a PowerShell prompt and run the following command:
+
+```powershell
+Set-ExecutionPolicy Bypass -Scope Process -Force; Invoke-Expression ((New-Object System.Net.WebClient).DownloadString('https://ohmyposh.dev/install.ps1'))
+```
+
 </TabItem>
 </Tabs>
 
@@ -97,6 +125,7 @@ scoop update oh-my-posh
   values={[
     { label: 'winget', value: 'winget', },
     { label: 'scoop', value: 'scoop', },
+    { label: 'manual', value: 'manual', },
   ]
 }>
 <TabItem value="winget">
@@ -112,6 +141,13 @@ You can find the themes scoop installs inside the `"$(scoop prefix oh-my-posh)\t
 To use `jandedobbeleer.omp.json` for example, you can refer to it using `"$(scoop prefix oh-my-posh)\themes\jandedobbeleer.omp.json"`
 when setting the prompt using the `--config` flag.
 
+</TabItem>
+<TabItem value="manual">
+
+You can find the themes winget installs inside the `$env:POSH_THEMES_PATH` folder.
+To use `jandedobbeleer.omp.json` for example, you can refer to it using `$env:POSH_THEMES_PATH\jandedobbeleer.omp.json`
+when setting the prompt using the `--config` flag.
+
 </TabItem>
 </Tabs>
 

docs/static/install.ps1

@@ -0,0 +1,54 @@
+$installInstructions = @'
+Hey friend
+
+This installer is only available for Windows.
+If you're looking for installation instructions for your operating system,
+please visit the following link:
+'@
+if ($IsMacOS) {
+    Write-Host @"
+$installInstructions
+
+https://ohmyposh.dev/docs/installation/macos
+"@
+    exit
+}
+if ($IsLinux) {
+    Write-Host @"
+$installInstructions
+
+https://ohmyposh.dev/docs/installation/linux
+"@
+    exit
+}
+$installer = ''
+$arch = (Get-CimInstance -Class Win32_Processor -Property Architecture).Architecture
+switch ($arch) {
+    0 { $installer = "install-386.exe" } # x86
+    5 { $installer = "install-arm64.exe" } # ARM
+    9 { $installer = "install-amd64.exe" } # x64
+    12 { $installer = "install-amd64.exe" } # x64 emulated on Surface Pro X
+}
+
+if ($installer -eq '') {
+    Write-Host @"
+The installer for system architecture ($arch) is not available.
+"@
+    exit
+}
+
+Write-Host "Downloading $installer..."
+$tmp = New-TemporaryFile | Rename-Item -NewName { $_ -replace 'tmp$', 'exe' } -PassThru
+$url = "https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/$installer"
+Invoke-WebRequest -OutFile $tmp $url
+Write-Host 'Running installer...'
+& "$tmp" /VERYSILENT | Out-Null
+$tmp | Remove-Item
+Write-Host @'
+Done!
+
+Restart your terminal and have a look at the
+documentation on how to proceed from here.
+
+https://ohmyposh.dev/docs/installation/prompt
+'@