From 6c752cbb2489fb9645f5abdb0542f13f37e13d7b Mon Sep 17 00:00:00 2001
From: Will Bradley <bradley.will@gmail.com>
Date: Wed, 17 Aug 2016 23:40:15 -0700
Subject: [PATCH 1/2] Linux: dynamically detect dependencies and list package
 names

This uses LookPath to check for dependency existence and
outputs a list of whichever dependencies are not yet installed.
Also outputs example apt/yum commands.
---
 linux.go | 39 +++++++++++++++++++++++++++++++++------
 1 file changed, 33 insertions(+), 6 deletions(-)

diff --git a/linux.go b/linux.go
index 62a56c0..d49fdb2 100644
--- a/linux.go
+++ b/linux.go
@@ -23,12 +23,39 @@ func NewLinuxTracker() Tracker {
 }
 
 func (t *LinuxTracker) Deps() string {
-	return `Install the following command-line utilities via your package manager (e.g., apt) of choice:
-* xdpyinfo
-* xwininfo
-* xdotool
-* wmctrl
-`
+	var output = "\r\nInstall these following command-line utilities via your package manager (e.g., apt) of choice:\r\n"
+	var depsRequired = false
+	if !verifyCommand("xdpyinfo") {
+		output += "\r\n* xdpyinfo"
+		depsRequired = true
+	}
+	if !verifyCommand("xwininfo") {
+		output += "\r\n* xwininfo"
+		depsRequired = true
+	}
+	if !verifyCommand("xdotool") {
+		output += "\r\n* xdotool"
+		depsRequired = true
+	}
+	if !verifyCommand("wmctrl") {
+		output += "\r\n* wmctrl"
+		depsRequired = true
+	}
+
+	if depsRequired {
+		return output+"\r\n\r\nExample deb/apt install command: apt-get install x11-utils xdotool wmctrl\r\nExample rpm/yum install command: yum install xorg-x11-utils xdotool wmctrl"
+	} else {
+		return `All dependencies already installed.`
+	}
+}
+
+func verifyCommand(file string) bool {
+	var _, err = exec.LookPath(file)
+	if err != nil {
+		return false
+	} else {
+		return true
+	}
 }
 
 func (t *LinuxTracker) Snap() (*Snapshot, error) {

From be7551a56a14e183ce476645b25ea27b96bd50e0 Mon Sep 17 00:00:00 2001
From: Will Bradley <bradley.will@gmail.com>
Date: Thu, 18 Aug 2016 11:17:58 -0700
Subject: [PATCH 2/2] Break long string up into shorter strings

---
 linux.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/linux.go b/linux.go
index d49fdb2..b3a993a 100644
--- a/linux.go
+++ b/linux.go
@@ -43,7 +43,9 @@ func (t *LinuxTracker) Deps() string {
 	}
 
 	if depsRequired {
-		return output+"\r\n\r\nExample deb/apt install command: apt-get install x11-utils xdotool wmctrl\r\nExample rpm/yum install command: yum install xorg-x11-utils xdotool wmctrl"
+		output += "\r\n\r\nExample deb/apt install command: apt-get install x11-utils xdotool wmctrl"
+		output += "\r\nExample rpm/yum install command: yum install xorg-x11-utils xdotool wmctrl"
+		return output
 	} else {
 		return `All dependencies already installed.`
 	}