From 5552a8501b605327a33d12d0cb5be6818ae00471 Mon Sep 17 00:00:00 2001
From: Greg Helton <greg@fallendusk.com>
Date: Sat, 6 Jul 2019 01:43:02 -0400
Subject: [PATCH] Add support for Gentoo

---
 cmd/linux.go         | 17 +++++++++++++++++
 cmd/prerequisites.go |  3 +++
 cmd/system.go        | 11 +++++++++++
 3 files changed, 31 insertions(+)

diff --git a/cmd/linux.go b/cmd/linux.go
index c15284958..5117e5e18 100644
--- a/cmd/linux.go
+++ b/cmd/linux.go
@@ -25,6 +25,8 @@ const (
 	RedHat
 	// Debian distribution
 	Debian
+	// Gentoo distribution
+	Gentoo
 )
 
 // DistroInfo contains all the information relating to a linux distribution
@@ -66,6 +68,8 @@ func GetLinuxDistroInfo() *DistroInfo {
 						result.Distribution = Arch
 					case "Debian":
 						result.Distribution = Debian
+					case "Gentoo":
+						result.Distribution = Gentoo
 					}
 				case "Description":
 					result.Description = value
@@ -113,6 +117,8 @@ func GetLinuxDistroInfo() *DistroInfo {
 			result.Distribution = Arch
 		case "Debian GNU/Linux":
 			result.Distribution = Debian
+		case "Gentoo/Linux":
+			result.Distribution = Gentoo
 		default:
 			result.Distribution = Unknown
 			result.DistributorID = osName
@@ -121,6 +127,17 @@ func GetLinuxDistroInfo() *DistroInfo {
 	return result
 }
 
+// EqueryInstalled uses equery to see if a package is installed
+func EqueryInstalled(packageName string) (bool, error) {
+	program := NewProgramHelper()
+	equery := program.FindProgram("equery")
+	if equery == nil {
+		return false, fmt.Errorf("cannont check dependencies: equery not found")
+	}
+	_, _, exitCode, _ := equery.Run("l", packageName)
+	return exitCode == 0, nil
+}
+
 // DpkgInstalled uses dpkg to see if a package is installed
 func DpkgInstalled(packageName string) (bool, error) {
 	program := NewProgramHelper()
diff --git a/cmd/prerequisites.go b/cmd/prerequisites.go
index 0d1a5901d..2ea579434 100644
--- a/cmd/prerequisites.go
+++ b/cmd/prerequisites.go
@@ -96,6 +96,9 @@ func getRequiredLibrariesLinux() (*Prerequisites, error) {
 	case Ubuntu:
 		result.Add(newPrerequisite("libgtk-3-dev", "Please install with `sudo apt install libgtk-3-dev` and try again"))
 		result.Add(newPrerequisite("libwebkit2gtk-4.0-dev", "Please install with `sudo apt install libwebkit2gtk-4.0-dev` and try again"))
+	case Gentoo:
+		result.Add(newPrerequisite("gtk+:3", "Please install with `sudo emerge gtk+:3` and try again"))
+		result.Add(newPrerequisite("webkit-gtk", "Please install with `sudo emerge webkit-gtk` and try again"))
 	case Arch:
 		result.Add(newPrerequisite("gtk3", "Please install with `sudo pacman -S gtk3` and try again"))
 		result.Add(newPrerequisite("webkit2gtk", "Please install with `sudo pacman -S webkit2gtk` and try again"))
diff --git a/cmd/system.go b/cmd/system.go
index 86ce69d9b..cb29708df 100644
--- a/cmd/system.go
+++ b/cmd/system.go
@@ -305,6 +305,17 @@ func CheckDependencies(logger *Logger) (bool, error) {
 				} else {
 					logger.Green("Library '%s' installed.", library.Name)
 				}
+			case Gentoo:
+				installed, err := EqueryInstalled(library.Name)
+				if err != nil {
+					return false, err
+				}
+				if !installed {
+					errors = true
+					logger.Error("Library '%s' not found. %s", library.Name, library.Help)
+				} else {
+					logger.Green("Library '%s' installed.", library.Name)
+				}
 			default:
 				return false, RequestSupportForDistribution(distroInfo, library.Name)
 			}