tweak(user): remap vi navigation for Colemak-DH

Oof, this feels good. Should've done this sooner.

1 files changed, 69 insertions, 0 deletions

diff --git a/user/nvim/init.lua b/user/nvim/init.lua
index 1ad6849..65077d2 100644
--- a/user/nvim/init.lua
+++ b/user/nvim/init.lua
@@ -1,6 +1,61 @@
 -- Configure settings that apply to all filetypes.
 -- Filetype-specific settings live in after/ftplugin/.
 
+-- Put Vim's directional keys on the Colemak-DH home-row positions. Move the
+-- displaced commands onto the old directional keys; use `o` for insert/inner
+-- text objects and `l` for open-line/switch-selection-end.
+local colemak_mappings = {
+  k = 'h', -- left
+  K = 'H', -- top of screen
+  n = 'j', -- down
+  N = 'J', -- join lines
+  e = 'k', -- up
+  E = 'K', -- keyword lookup
+  i = 'l', -- right
+  I = 'L', -- bottom of screen
+  h = 'e', -- end of word
+  H = 'E', -- end of WORD
+  ['<Space>'] = 'n', -- next search result
+  ['<BS>'] = 'N', -- previous search result
+  o = 'i', -- insert / inner text object
+  O = 'I', -- insert at start
+  l = 'o', -- open line / switch selection end
+  L = 'O', -- open line above / switch selection end
+
+  -- g-prefixed commands
+  gn = 'gj', -- down one display line
+  ge = 'gk', -- up one display line
+  ['g<Space>'] = 'gn', -- select next search result
+  ['g<BS>'] = 'gN', -- select previous search result
+  gh = 'ge', -- previous end of word
+  gk = 'gh', -- start Select mode
+}
+
+for lhs, rhs in pairs(colemak_mappings) do
+  vim.keymap.set({ 'n', 'x', 'o' }, lhs, rhs)
+end
+
+-- Focus or move a window in the given direction.
+local colemak_window_mappings = {
+  ['<C-w>k'] = '<C-w>h', -- focus left
+  ['<C-w><C-k>'] = '<C-w>h',
+  ['<C-w>K'] = '<C-w>H', -- move left
+  ['<C-w>n'] = '<C-w>j', -- focus down
+  ['<C-w><C-n>'] = '<C-w>j',
+  ['<C-w>N'] = '<C-w>J', -- move down
+  ['<C-w>e'] = '<C-w>k', -- focus up
+  ['<C-w><C-e>'] = '<C-w>k',
+  ['<C-w>E'] = '<C-w>K', -- move up
+  ['<C-w>i'] = '<C-w>l', -- focus right
+  ['<C-w><C-i>'] = '<C-w>l',
+  ['<C-w>I'] = '<C-w>L', -- move right
+  ['<C-w><Space>'] = '<C-w>n', -- new window
+}
+
+for lhs, rhs in pairs(colemak_window_mappings) do
+  vim.keymap.set('n', lhs, rhs)
+end
+
 -- Don't break words in the middle.
 vim.opt.linebreak = true
 
@@ -168,6 +223,20 @@ vim.keymap.set('n', '<C-p>', function()
   pick.builtin.files({ tool = tool })
 end, { desc = 'Pick files' })
 
+-- Neovim normally maps K to LSP hover on attach, but K is already used by the
+-- Colemak mappings. Put hover on E in buffers whose LSP supports it instead.
+vim.api.nvim_create_autocmd('LspAttach', {
+  callback = function(args)
+    local client = vim.lsp.get_client_by_id(args.data.client_id)
+    if client and client:supports_method('textDocument/hover', args.buf) then
+      vim.keymap.set('n', 'E', vim.lsp.buf.hover, {
+        buffer = args.buf,
+        desc = 'LSP hover',
+      })
+    end
+  end,
+})
+
 vim.keymap.set('n', 'gd', vim.lsp.buf.definition, {
   desc = 'LSP: Go to definition',
 })