fish greeting with ssh-agent magic

Signed-off-by: Georg <georg@lysergic.dev>

scripts/fish/conf.d/greeting.fish

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+function fish_greeting
+echo "Welcome!"
+end

scripts/fish/conf.d/sshagent.fish

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+# original from https://github.com/danhper/fish-ssh-agent/
+# adapted to include ssh-add check
+function sshagent
+        if test -z "$SSH_ENV"
+            set -xg SSH_ENV $HOME/.ssh/environment
+        end
+
+        if not __ssh_agent_is_started
+            __ssh_agent_start
+        end
+
+        if not __ssh_agent_is_key_added
+                echo "You need to authenticate."
+                ssh-add -q ~/.ssh/id_lysergic
+        end
+end

scripts/fish/functions/__ssh_agent_is_key_added.fish

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+# custom
+function __ssh_agent_is_key_added -d "checks if fingerprint is already present"
+        set SSH_FP (ssh-keygen -lf ~/.ssh/id_lysergic-cert.pub | awk '{print $2}')
+        if ! test -z "$SSH_FP"
+                and ssh-add -l | grep -q "$SSH_FP"
+        else
+                return 1
+        end
+end

scripts/fish/functions/__ssh_agent_is_started.fish

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+# 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

scripts/fish/functions/__ssh_agent_start.fish

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+# 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