home: zsh: migrate to 'initContent'

This also fixes a small ordering issue: my alias definitions used to be
defined at the very end of the file, they're now slotted _before_ the
`zshrc.local` import.

flake.lock

@@ -136,11 +136,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1741955947,
-        "narHash": "sha256-2lbURKclgKqBNm7hVRtWh0A7NrdsibD0EaWhahUVhhY=",
+        "lastModified": 1742771635,
+        "narHash": "sha256-HQHzQPrg+g22tb3/K/4tgJjPzM+/5jbaujCZd8s2Mls=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "4e12151c9e014e2449e0beca2c0e9534b96a26b4",
+        "rev": "ad0614a1ec9cce3b13169e20ceb7e55dfaf2a818",
         "type": "github"
       },
       "original": {
@@ -152,11 +152,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1742069588,
-        "narHash": "sha256-C7jVfohcGzdZRF6DO+ybyG/sqpo1h6bZi9T56sxLy+k=",
+        "lastModified": 1742669843,
+        "narHash": "sha256-G5n+FOXLXcRx+3hCJ6Rt6ZQyF1zqQ0DL0sWAMn2Nk0w=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c80f6a7e10b39afcc1894e02ef785b1ad0b0d7e5",
+        "rev": "1e5b653dff12029333a6546c11e108ede13052eb",
         "type": "github"
       },
       "original": {
@@ -200,11 +200,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1742058297,
-        "narHash": "sha256-b4SZc6TkKw8WQQssbN5O2DaCEzmFfvSTPYHlx/SFW9Y=",
+        "lastModified": 1742649964,
+        "narHash": "sha256-DwOTp7nvfi8mRfuL1escHDXabVXFGT1VlPD1JHrtrco=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "59f17850021620cd348ad2e9c0c64f4e6325ce2a",
+        "rev": "dcf5072734cb576d2b0c59b2ac44f5050b5eac82",
         "type": "github"
       },
       "original": {

modules/home/zsh/default.nix

@@ -87,28 +87,26 @@ in
         # Modal editing is life, but CLI benefits from emacs gymnastics
         defaultKeymap = "emacs";
 
-        # Make those happen early to avoid doing double the work
-        initExtraFirst = lib.mkBefore ''
-          ${
-            lib.optionalString cfg.launchTmux ''
-              # Launch tmux unless already inside one
-              if [ -z "$TMUX" ]; then
-                exec tmux new-session
-              fi
-            ''
-          }
-        '';
+        initContent = lib.mkMerge [
+          # Make those happen early to avoid doing double the work
+          (lib.mkBefore (lib.optionalString cfg.launchTmux ''
+            # Launch tmux unless already inside one
+            if [ -z "$TMUX" ]; then
+              exec tmux new-session
+            fi
+          ''))
 
-        initExtra = lib.mkAfter ''
-          source ${./completion-styles.zsh}
-          source ${./extra-mappings.zsh}
-          source ${./options.zsh}
+          (lib.mkAfter ''
+            source ${./completion-styles.zsh}
+            source ${./extra-mappings.zsh}
+            source ${./options.zsh}
 
-          # Source local configuration
-          if [ -f "$ZDOTDIR/zshrc.local" ]; then
-            source "$ZDOTDIR/zshrc.local"
-          fi
-        '';
+            # Source local configuration
+            if [ -f "$ZDOTDIR/zshrc.local" ]; then
+              source "$ZDOTDIR/zshrc.local"
+            fi
+          '')
+        ];
 
         localVariables = {
           # I like having the full path
@@ -151,7 +149,7 @@ in
         };
 
         # Use OSC-777 to send the notification through SSH
-        initExtra = lib.mkIf cfg.notify.ssh.useOsc777 ''
+        initContent = lib.mkIf cfg.notify.ssh.useOsc777 ''
           done_send_notification() {
             local exit_status="$1"
             local title="$2"