Move to a profile-based configuration where common

This patch makes it so common configuration is now located in shared/
and each host basically just becomes a bunch of import statements.

The exception here is host-specific configuration like the `*.linus.onl`
that live inside `hosts/ahmed/`.

Specifically I have:

- moved common configuration `shared/{nixos,home-manager,nix-darwin}`.
- moved `hosts/common.nix` to `shared/nixos/common-{nix,shell}-settings.nix`.
- split `hosts/muhammed/{dev-utils,neovim}` into per-language
  configuration.

This patch was done in preparation for the arrival of a new host, which
will need to share a lot of configuration with Muhammed.

2 files changed, 53 insertions, 0 deletions

diff --git a/shared/home-manager/iterm2/auto_theme.py b/shared/home-manager/iterm2/auto_theme.py
new file mode 100644
index 0000000..0970304
--- /dev/null
+++ b/shared/home-manager/iterm2/auto_theme.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+import asyncio
+import iterm2
+
+async def update(connection, theme):
+    # Themes have space-delimited attributes, one of which will be light or dark.
+    parts = theme.split(" ")
+    if "dark" in parts:
+        preset = await iterm2.ColorPreset.async_get(connection, "Dark Background")
+    else:
+        preset = await iterm2.ColorPreset.async_get(connection, "Light Background")
+
+    # Update the list of all profiles and iterate over them.
+    profiles=await iterm2.PartialProfile.async_query(connection)
+    for partial in profiles:
+        # Fetch the full profile and then set the color preset in it.
+        profile = await partial.async_get_full_profile()
+        await profile.async_set_color_preset(preset)
+
+async def main(connection):
+    app = await iterm2.async_get_app(connection)
+    await update(connection, await app.async_get_variable("effectiveTheme"))
+    async with iterm2.VariableMonitor(connection, iterm2.VariableScopes.APP, "effectiveTheme", None) as mon:
+        while True:
+            # Block until theme changes
+            theme = await mon.async_get()
+            await update(connection, theme)
+
+
+iterm2.run_forever(main)
diff --git a/shared/home-manager/iterm2/default.nix b/shared/home-manager/iterm2/default.nix
new file mode 100644
index 0000000..b6a9ecc
--- /dev/null
+++ b/shared/home-manager/iterm2/default.nix
@@ -0,0 +1,22 @@
+# This file configures iterm2. Note that the actual definition of iTerm2 for
+# home-manager is in `modules/home-manager/iterm2`. *That* file declares
+# `options.programs.iterm2.enable`.
+{pkgs, ...}: {
+  config = {
+    home.packages = with pkgs; [imgcat];
+
+    # Install a script which automatically makes iTerm2 match the system-wide light/dark mode.
+    home.file."/Library/Application Support/iTerm2/Scripts/AutoLaunch/auto_theme.py".text = builtins.readFile ./auto_theme.py;
+
+    programs.iterm2 = {
+      enable = true;
+      # config = {
+      #   # Use the minimal tab style.
+      #   # See: https://github.com/gnachman/iTerm2/blob/bd40fba0611fa94684dadf2478625f2a93eb6e47/sources/iTermPreferences.h#L29
+      #   TabStyleWithAutomaticOption = 5;
+      # };
+
+      shellIntegration.enableZshIntegration = true;
+    };
+  };
+}