Add ssh-agent setup for fish

fish/config.fish

@@ -42,6 +42,26 @@ alias mkdir "mkdir -p"
 # Make sl run ls afterwards
 alias sl "/usr/local/bin/sl; and ls"
 
+# SSH Agent
+setenv SSH_ENV "$HOME/.ssh/environment"
+if [ -n "$SSH_AGENT_PID" ]
+    ps -ef | grep $SSH_AGENT_PID | grep ssh-agent > /dev/null
+    if [ $status -eq 0 ]
+        test_identities
+    end
+else
+    if [ -f $SSH_ENV ]
+        . $SSH_ENV > /dev/null
+    end
+    ps -ef | grep $SSH_AGENT_PID | grep -v grep | grep ssh-agent > /dev/null
+    if [ $status -eq 0 ]
+        test_identities
+    else
+        start_agent
+    end
+end
+
+
 # Fish colour customisations
 set fish_color_autosuggestion "-o" "black"
 set fish_color_command "-o" "cyan"

fish/functions/start_agent.fish

@@ -0,0 +1,9 @@
+function start_agent
+    echo "Initializing new SSH agent ..."
+    ssh-agent -c | sed 's/^echo/#echo/' > $SSH_ENV
+    echo "succeeded"
+    chmod 600 $SSH_ENV 
+    . $SSH_ENV > /dev/null
+    ssh-add
+end
+

fish/functions/test_identities.fish

@@ -0,0 +1,10 @@
+function test_identities
+    ssh-add -l | grep "The agent has no identities" > /dev/null
+    if [ $status -eq 0 ]
+        ssh-add
+        if [ $status -eq 2 ]
+            start_agent
+        end
+    end
+end
+