feat(ollama+windows): replace placeholder with working installer

ollama/install.ps1

@@ -1,5 +1,64 @@
 #!/usr/bin/env pwsh
 
-Write-Host "Error: ollama doesn't have Windows support yet:"
-Write-Host "See https://github.com/jmorganca/ollama/issues/403"
-exit 1
+##################
+# Install ollama #
+##################
+
+# Every package should define these variables
+$pkg_cmd_name = "ollama"
+
+$pkg_dst_cmd = "$Env:USERPROFILE\.local\opt\ollama\ollama.exe"
+$pkg_dst_bin = "$Env:USERPROFILE\.local\opt\ollama"
+$pkg_dst_dir = "$Env:USERPROFILE\.local\opt\ollama"
+$pkg_dst = "$pkg_dst_dir"
+
+$pkg_src_cmd = "$Env:USERPROFILE\.local\opt\ollama-v$Env:WEBI_VERSION\ollama.exe"
+$pkg_src_bin = "$Env:USERPROFILE\.local\opt\ollama-v$Env:WEBI_VERSION"
+$pkg_src_dir = "$Env:USERPROFILE\.local\opt\ollama-v$Env:WEBI_VERSION"
+$pkg_src = "$pkg_src_dir"
+
+New-Item "$Env:USERPROFILE\Downloads\webi" -ItemType Directory -Force | Out-Null
+$pkg_download = "$Env:USERPROFILE\Downloads\webi\ollama\$Env:WEBI_VERSION\$Env:WEBI_PKG_FILE"
+
+# Fetch archive
+IF (!(Test-Path -Path "$pkg_download")) {
+    Write-Output "    Downloading ollama v$Env:WEBI_VERSION from $Env:WEBI_PKG_URL to $pkg_download"
+    & curl.exe -A "$Env:WEBI_UA" -fsSL "$Env:WEBI_PKG_URL" -o "$pkg_download.part"
+    & Move-Item "$pkg_download.part" "$pkg_download"
+}
+
+IF (!(Test-Path -Path "$pkg_src_dir")) {
+    Write-Output "    Installing ollama v$Env:WEBI_VERSION"
+
+    Push-Location .local\tmp
+
+    # Remove any leftover tmp cruft
+    Remove-Item -Path ".\ollama*" -Recurse -ErrorAction Ignore
+
+    # Unpack archive file into this temporary directory
+    New-Item "ollama-v$Env:WEBI_VERSION" -ItemType Directory -Force | Out-Null
+    Push-Location "ollama-v$Env:WEBI_VERSION"
+
+    # Windows BSD-tar handles zip. Imagine that.
+    Write-Output "Unpacking $pkg_download"
+    & tar xf "$pkg_download"
+
+    Pop-Location
+
+    # Settle unpacked archive into place
+    Write-Output "Install Location: $pkg_src_cmd"
+    Move-Item -Path ".\ollama*" -Destination "$pkg_src_dir"
+
+    # Exit tmp
+    Pop-Location
+}
+
+Write-Output "    Copying into '$pkg_dst_dir' from '$pkg_src_dir'"
+Remove-Item -Path "$pkg_dst_dir" -Recurse -ErrorAction Ignore | Out-Null
+Copy-Item -Path "$pkg_src" -Destination "$pkg_dst" -Recurse
+webi_path_add "$pkg_dst_bin"
+$version_output = & "$pkg_dst_cmd" --version
+$version_line = $version_output |
+  ForEach-Object { $_.Split(':')[1].Trim() } |
+  Where-Object { $_ -match "version" }
+Write-Output "    Installed Ollama: $version_line"