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.

1 files changed, 47 insertions, 0 deletions

diff --git a/shared/home-manager/neovim/completion.nix b/shared/home-manager/neovim/completion.nix
new file mode 100644
index 0000000..3776674
--- /dev/null
+++ b/shared/home-manager/neovim/completion.nix
@@ -0,0 +1,47 @@
+# This module sets up auto completion for Neovim.
+{pkgs, ...}: {
+  programs.neovim.plugins = with pkgs.vimPlugins; [
+    # This is the actual completion engine.
+    {
+      plugin = nvim-cmp;
+      type = "lua";
+      config = ''
+        local cmp = require("cmp")
+
+        cmp.setup({
+        	mapping = cmp.mapping.preset.insert({
+        		["<C-b>"] = cmp.mapping.scroll_docs(-4),
+        		["<C-f>"] = cmp.mapping.scroll_docs(4),
+        		["<C-j>"] = cmp.mapping.select_next_item(),
+        		["<C-k>"] = cmp.mapping.select_prev_item(),
+        		["<C-Space>"] = cmp.mapping.complete(),
+        		["<C-e>"] = cmp.mapping.abort(),
+        		["<Tab>"] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+        	}),
+        	sources = cmp.config.sources({
+        		{ name = "nvim_lsp" },
+        		{ name = "calc" },
+        		{ name = "path" },
+        		{ name = "buffer" },
+        	}),
+        	-- disable completion in comments
+        	enabled = function()
+        		local context = require("cmp.config.context")
+        		-- keep command mode completion enabled when cursor is in a comment
+        		if vim.api.nvim_get_mode().mode == "c" then
+        			return true
+        		else
+        			return not context.in_treesitter_capture("comment")
+        			   and not context.in_syntax_group("Comment")
+        		end
+        	end
+        })
+      '';
+    }
+    # The following are plugins for the... completion plugin.
+    cmp-nvim-lsp
+    cmp-calc
+    cmp-buffer
+    cmp-path
+  ];
+}