Add PowerShell install script

README.md

@@ -66,6 +66,9 @@ cp dotbot/tools/hg-subrepo/install .
 touch install.conf.yaml
 ```
 
+If you are using PowerShell instead of a POSIX shell, you can use the provided
+`install.ps1` script instead of `install`.
+
 To get started, you just need to fill in the `install.conf.yaml` and Dotbot
 will take care of the rest. To help you get started we have [an
 example](#full-example) config file as well as [configuration

tools/git-submodule/install.ps1

@@ -0,0 +1,22 @@
+$ErrorActionPreference = "Stop"
+
+$CONFIG = "install.conf.yaml"
+$DOTBOT_DIR = "dotbot"
+
+$DOTBOT_BIN = "bin/dotbot"
+$BASEDIR = $PSScriptRoot
+
+Set-Location $BASEDIR
+git -C $DOTBOT_DIR submodule sync --quiet --recursive
+git submodule update --init --recursive $DOTBOT_DIR
+
+foreach ($PYTHON in ('python', 'python3', 'python2')) {
+    # Python redirects to Microsoft Store in Windows 10 when not installed
+    if (& { $ErrorActionPreference = "SilentlyContinue"
+            ![string]::IsNullOrEmpty((&$PYTHON -V))
+            $ErrorActionPreference = "Stop" }) {
+        &$PYTHON $(Join-Path $BASEDIR -ChildPath $DOTBOT_DIR | Join-Path -ChildPath $DOTBOT_BIN) -d $BASEDIR -c $CONFIG $Args
+        return
+    }
+}
+Write-Error "Error: Cannot find Python."

tools/hg-subrepo/install.ps1

@@ -0,0 +1,21 @@
+$ErrorActionPreference = "Stop"
+
+$CONFIG = "install.conf.yaml"
+$DOTBOT_DIR = "dotbot"
+
+$DOTBOT_BIN = "bin/dotbot"
+$BASEDIR = $PSScriptRoot
+
+Set-Location $BASEDIR
+
+Set-Location $DOTBOT_DIR && git submodule update --init --recursive
+foreach ($PYTHON in ('python', 'python3', 'python2')) {
+    # Python redirects to Microsoft Store in Windows 10 when not installed
+    if (& { $ErrorActionPreference = "SilentlyContinue"
+            ![string]::IsNullOrEmpty((&$PYTHON -V))
+            $ErrorActionPreference = "Stop" }) {
+        &$PYTHON $(Join-Path $BASEDIR -ChildPath $DOTBOT_DIR | Join-Path -ChildPath $DOTBOT_BIN) -d $BASEDIR -c $CONFIG $Args
+        return
+    }
+}
+Write-Error "Error: Cannot find Python."