Add support for multi-connection downloads via aria2c

README.md

@@ -48,14 +48,28 @@ Scoop is very scriptable, so you can run repeatable setups to get your environme
 ```powershell
 scoop install sudo
 sudo scoop install 7zip git openssh --global
-scoop install curl grep sed less touch
+scoop install aria2 curl grep sed less touch
 scoop install python ruby go perl
 ```
 
 If you've built software that you'd like others to use, Scoop is an alternative to building an installer (e.g. MSI or InnoSetup)—you just need to zip your program and provide a JSON manifest that describes how to install it.
 
 ## [Documentation](https://github.com/lukesampson/scoop/wiki)
 
+## Multi-connection downloads with `aria2`
+Scoop can utilize [`aria2`](https://github.com/aria2/aria2) to use multi-connection downloads. Simply install `aria2` through Scoop and it will be used for all downloads afterward.
+```powershell
+scoop install aria2
+```
+
+You can tweak the following `aria2` settings with the `scoop config` command:
+
+- aria2-enabled (default: true)
+- [aria2-retry-wait](https://aria2.github.io/manual/en/html/aria2c.html#cmdoption-retry-wait) (default: 2)
+- [aria2-split](https://aria2.github.io/manual/en/html/aria2c.html#cmdoption-s) (default: 5)
+- [aria2-max-connection-per-server](https://aria2.github.io/manual/en/html/aria2c.html#cmdoption-x) (default: 5)
+- [aria2-min-split-size](https://aria2.github.io/manual/en/html/aria2c.html#cmdoption-k) (default: 5M)
+
 ### Inspiration
 
 * [Homebrew](http://mxcl.github.io/homebrew/)

lib/config.ps1

@@ -41,7 +41,10 @@ function load_cfg {
     }
 }
 
-function get_config($name) {
+function get_config($name, $default) {
+    if($null -eq $cfg.$name -and $null -ne $default) {
+        return $default
+    }
     return $cfg.$name
 }
 

lib/core.ps1

@@ -96,6 +96,31 @@ function installed_apps($global) {
     }
 }
 
+function aria2_path() {
+    # normal path to executable
+    $aria2 = "$(versiondir 'aria2' 'current' $false)\aria2c.exe"
+    if(Test-Path($aria2)) {
+        return $aria2
+    }
+
+    # global path to executable
+    $aria2 = "$(versiondir 'aria2' 'current' $true)\aria2c.exe"
+    if(Test-Path($aria2)) {
+        return $aria2
+    }
+
+    # not found
+    return $null
+}
+
+function aria2_installed() {
+    return ![String]::IsNullOrWhiteSpace("$(aria2_path)")
+}
+
+function aria2_enabled() {
+    return (aria2_installed) -and (get_config 'aria2-enabled' $true)
+}
+
 function app_status($app, $global) {
     $status = @{}
     $status.installed = (installed $app $global)
@@ -579,6 +604,19 @@ function format_hash([String] $hash) {
     return $hash
 }
 
+function format_hash_aria2([String] $hash) {
+    $hash = $hash -split ':' | Select-Object -Last 1
+    switch ($hash.Length)
+    {
+        32 { $hash = "md5=$hash" } # md5
+        40 { $hash = "sha-1=$hash" } # sha1
+        64 { $hash = "sha-256=$hash" } # sha256
+        128 { $hash = "sha-512=$hash" } # sha512
+        default { $hash = $null }
+    }
+    return $hash
+}
+
 function handle_special_urls($url)
 {
     # FossHub.com
@@ -590,5 +628,11 @@ function handle_special_urls($url)
         $url = "https://www.fosshub.com/gensLink/$name/$filename/2053434f4f5053434f4f5020"
         $url = (Invoke-WebRequest -Uri $url | Select-Object -ExpandProperty Content)
     }
+
+    # Sourceforge.net
+    if ($url -match "(?:downloads\.)?sourceforge.net\/projects?\/(?<project>[^\/]+)\/(?:files\/)?(?<file>.*)") {
+        # Reshapes the URL to avoid redirections
+        $url = "https://downloads.sourceforge.net/project/$($matches['project'])/$($matches['file'])?r=&ts="
+    }
     return $url
 }