feat(home/fish): move fish's code to external files

It's easier to edit / debug / test the code that way.

This also add a new function (`find-ssh-agent') to find or start a new
ssh agent when a shell is started.

2 files changed, 22 insertions, 2 deletions

diff --git a/home/shell/fish/functions/find-ssh-agent.fish b/home/shell/fish/functions/find-ssh-agent.fish
new file mode 100644
index 0000000..9e2de8d
--- /dev/null
+++ b/home/shell/fish/functions/find-ssh-agent.fish
@@ -0,0 +1,20 @@
+function find-ssh-agent --description "find or run ssh-agent"
+    # let's avoid storing the agent's socket under /tmp
+    set -l ssh_auth_sock $XDG_RUNTIME_DIR/ssh-agent.sock
+
+    if set -q SSH_AGENT_PID; and set -q SSH_AUTH_SOCK
+        # if variables already defined, then try to connect to agent
+        ssh-add -l &>/dev/null
+        test $status -ne 2; and return
+    end
+
+    set -l user_id (id -u)
+    set -l ssh_agent_pid (pgrep --exact --newest --uid $user_id ssh-agent)
+
+    if test -S $ssh_auth_sock
+        set --global --export SSH_AUTH_SOCK $ssh_auth_sock
+        set --global --export SSH_AGENT_PID $ssh_agent_pid
+    else
+        eval (ssh-agent -c -a $ssh_auth_sock)
+    end
+end
diff --git a/home/shell/fish/functions/nix-rebuild-host.fish b/home/shell/fish/functions/nix-rebuild-host.fish
index 1ec7daa..02c0050 100644
--- a/home/shell/fish/functions/nix-rebuild-host.fish
+++ b/home/shell/fish/functions/nix-rebuild-host.fish
@@ -1,4 +1,4 @@
 function nix-rebuild-host --description "rebuild the current host"
-  cd ~/workspace/world
-  sudo nixos-rebuild switch --flake .
+    cd ~/workspace/world
+    sudo nixos-rebuild switch --flake .
 end