Use curl instead of iwr on Windows

[MarkTiedemann]

Since early 2018, curl is available as %SystemRoot%\System32\curl.exe on Windows (see: https://devblogs.microsoft.com/commandline/tar-and-curl-come-to-windows/). So instead of Invoke-WebRequest we could use curl some day in the future, once we decide to no longer support older Windows versions.

This would allow us to harmonize the output of the Shell and the PowerShell installer.

On a side note, this may allow us to drop the requirement of powershell.exe in favor of cmd.exe: The main reason that powershell.exe is used for our Windows installer rather than cmd is that cmd has no built-in utilities for making HTTP requests and no utilities for extracting archives (though, similar to curl.exe, tar.exe is a built-in utility on Windows now, too).

On yet another note, curl is a few seconds faster for downloading the deno.zip compared to iwr from my limited testing.

[MarkTiedemann]

Download latest Deno version using cmd + curl in one line:

C:\>for /f "delims=/ tokens=6" %v in ('"curl -s https://github.com/denoland/deno/releases | findstr \/denoland/deno/releases/download/.*/deno-x86_64-pc-windows-msvc.zip | findstr /n . | findstr ^1:"') do @curl -LO https://github.com/denoland/deno/releases/download/%v/deno-x86_64-pc-windows-msvc.zip

Explanation:

• Download the HTML from the release page: curl -s https://github.com/denoland/deno/releases
• Find all lines that contain a Windows download link: | findstr \/denoland/deno/releases/download/.*/deno-x86_64-pc-windows-msvc.zip
• Number those lines: | findstr /n .
• Keep only the first line: | findstr ^1:
• Split the download link with the character / and only keep the substring number 6, which is the version number: for /f "delims=/ tokens=6" %v in ...
• Knowing the version number %v, download the latest Deno .zip file: curl -LO https://github.com/denoland/deno/releases/download/%v/deno-x86_64-pc-windows-msvc.zip

Note that, in order to run this batch script from a install.cmd file downloaded from a URL, the install command would have to be something like this:

curl -O https://deno.land/x/install/install.cmd & install & del install.cmd

e.g. download a temp file, run it, delete it. As far as I know, there's no eval for cmd.exe.

PS: If anyone reading this is interested in using cmd for managing Deno, please check out: https://github.com/MarkTiedemann/dvm.cmd, a Deno Version Manager I wrote.

[MarkTiedemann]

On yet another random note, there's the possibility to write the Deno installer for Windows in JavaScript, uh, JScript, which is installed on Windows by default as part of the Windows Script Host:

C:\>echo WSH.Echo("Hello, world!") > hello.js
C:\>cscript //e:jscript //nologo hello.js
Hello, world!

[MarkTiedemann]

Download, extract, and run latest Deno version in one line of batch:

C:\>for /f "delims=/ tokens=6" %v in ('"curl -s https://github.com/denoland/deno/releases | findstr \/denoland/deno/releases/download/.*/deno-x86_64-pc-windows-msvc.zip | findstr /n . | findstr ^1:"') do @curl -Lo deno.zip https://github.com/denoland/deno/releases/download/%v/deno-x86_64-pc-windows-msvc.zip& @tar xf deno.zip& @.\deno -V
deno 1.1.2

[MarkTiedemann]

Closing in favor of #154.