add fish ssh agent

.config/fish/conf.d/fish-ssh-agent.fish

@@ -0,0 +1,8 @@
+# From https://github.com/danhper/fish-ssh-agent
+if test -z "$SSH_ENV"
+  set -xg SSH_ENV $HOME/.ssh/environment
+end
+
+if not __ssh_agent_is_started
+  __ssh_agent_start
+end

.config/fish/functions/__ssh_agent_is_started.fish

@@ -0,0 +1,15 @@
+# From https://github.com/danhper/fish-ssh-agent
+function __ssh_agent_is_started -d "check if ssh agent is already started"
+  if begin; test -f $SSH_ENV; and test -z "$SSH_AGENT_PID"; end
+    source $SSH_ENV > /dev/null
+  end
+
+  if begin; test -z "$SSH_AGENT_PID"; and test -z "$SSH_CONNECTION"; end
+    return 1
+  end
+
+  ssh-add -l > /dev/null 2>&1
+  if test $status -eq 2
+    return 1
+  end
+end

.config/fish/functions/__ssh_agent_start.fish

@@ -0,0 +1,6 @@
+# From https://github.com/danhper/fish-ssh-agent
+function __ssh_agent_start -d "start a new ssh agent"
+  ssh-agent -c | sed 's/^echo/#echo/' > $SSH_ENV
+  chmod 600 $SSH_ENV
+  source $SSH_ENV > /dev/null
+end