GPG as SSH agent

Did you know? It's the second time I'm doing this change because my SSD
crashed and I DIDN'T PUSH. Rrrrr

config/shell/shenv

@@ -10,27 +10,6 @@ export EDITOR=nvim
 export VISUAL=nvim
 export BROWSER=firefox
 
-# Load ssh-agent... ONCE
-
-SSH_ENV="$HOME/.ssh/environment"
-
-start_agent() {
-    ssh-agent > "${SSH_ENV}"
-    chmod 600 "${SSH_ENV}"
-    . "${SSH_ENV}" > /dev/null
-}
-
-if [ -f "${SSH_ENV}" ]
-then
-    . "${SSH_ENV}" > /dev/null
-    if [ ! -d "/proc/${SSH_AGENT_PID}" ] || [ "$(cat "/proc/${SSH_AGENT_PID}/comm")" != "ssh-agent" ]
-    then
-        start_agent
-    fi
-else
-    start_agent
-fi
-
 direnv() { # environment variable name, path
     export "$1"="$2"
     mkdir -p "$2"
@@ -127,4 +106,35 @@ prependpath "$HOME/.config/scripts"
     prependpath "$HOME/.termux/bin"
 )
 
-# For superseding commands with better ones if they are present
+
+if grep -q enable-ssh-support "$GNUPGHOME/gpg-agent.conf" 2> /dev/null
+then
+    # Use GPG as SSH agent
+    unset SSH_AGENT_PID
+    if [ "${gnupg_SSH_AUTH_SOCK_by:-0}" -ne $$ ]; then
+      export SSH_AUTH_SOCK="$(gpgconf --list-dirs agent-ssh-socket)"
+    fi
+    export GPG_TTY=$(tty)
+    gpg-connect-agent updatestartuptty /bye >/dev/null
+
+else
+    # Start regular SSH agent if not already started
+    SSH_ENV="$HOME/.ssh/environment"
+
+    start_agent() {
+        ssh-agent > "${SSH_ENV}"
+        chmod 600 "${SSH_ENV}"
+        . "${SSH_ENV}" > /dev/null
+    }
+
+    if [ -f "${SSH_ENV}" ]
+    then
+        . "${SSH_ENV}" > /dev/null
+        if [ ! -d "/proc/${SSH_AGENT_PID}" ] || [ "$(cat "/proc/${SSH_AGENT_PID}/comm")" != "ssh-agent" ]
+        then
+            start_agent
+        fi
+    else
+        start_agent
+    fi
+fi