refactor: rename vim.highlight => vim.hl

Problem:
- `vim.highlight` module does not follow `:help dev-name-common`, which
  documents the name for "highlight" as "hl".
- Shorter names are usually preferred.

Solution:
Rename `vim.highlight` to `vim.hl`.

This is not a breaking change until 2.0 (or maybe never).

8 files changed, 21 insertions, 19 deletions

diff --git a/runtime/lua/vim/_editor.lua b/runtime/lua/vim/_editor.lua
index 037cef9383..7aba7498f9 100644
--- a/runtime/lua/vim/_editor.lua
+++ b/runtime/lua/vim/_editor.lua
@@ -32,7 +32,7 @@ for k, v in pairs({
   func = true,
   F = true,
   lsp = true,
-  highlight = true,
+  hl = true,
   diagnostic = true,
   keymap = true,
   ui = true,
@@ -1197,4 +1197,7 @@ require('vim._options')
 ---@deprecated
 vim.loop = vim.uv
 
+-- Deprecated. Remove at Nvim 2.0
+vim.highlight = vim._defer_deprecated_module('vim.highlight', 'vim.hl')
+
 return vim
diff --git a/runtime/lua/vim/_meta.lua b/runtime/lua/vim/_meta.lua
index c9f207cb20..f8672d1f1f 100644
--- a/runtime/lua/vim/_meta.lua
+++ b/runtime/lua/vim/_meta.lua
@@ -15,7 +15,7 @@ vim.fs = require('vim.fs')
 vim.func = require('vim.func')
 vim.glob = require('vim.glob')
 vim.health = require('vim.health')
-vim.highlight = require('vim.highlight')
+vim.hl = require('vim.hl')
 vim.iter = require('vim.iter')
 vim.keymap = require('vim.keymap')
 vim.loader = require('vim.loader')
diff --git a/runtime/lua/vim/diagnostic.lua b/runtime/lua/vim/diagnostic.lua
index 99fcfd57e7..3570956efd 100644
--- a/runtime/lua/vim/diagnostic.lua
+++ b/runtime/lua/vim/diagnostic.lua
@@ -1498,13 +1498,13 @@ M.handlers.underline = {
         end
       end
 
-      vim.highlight.range(
+      vim.hl.range(
         bufnr,
         underline_ns,
         higroup,
         { diagnostic.lnum, diagnostic.col },
         { diagnostic.end_lnum, diagnostic.end_col },
-        { priority = vim.highlight.priorities.diagnostics }
+        { priority = vim.hl.priorities.diagnostics }
       )
     end
     save_extmarks(underline_ns, bufnr)
diff --git a/runtime/lua/vim/highlight.lua b/runtime/lua/vim/hl.lua
index a8d88db372..49bbaa3cc6 100644
--- a/runtime/lua/vim/highlight.lua
+++ b/runtime/lua/vim/hl.lua
@@ -17,7 +17,7 @@ M.priorities = {
   user = 200,
 }
 
---- @class vim.highlight.range.Opts
+--- @class vim.hl.range.Opts
 --- @inlinedoc
 ---
 --- Type of range. See [getregtype()]
@@ -28,8 +28,8 @@ M.priorities = {
 --- (default: `false`)
 --- @field inclusive? boolean
 ---
---- Indicates priority of highlight
---- (default: `vim.highlight.priorities.user`)
+--- Highlight priority
+--- (default: `vim.hl.priorities.user`)
 --- @field priority? integer
 
 --- Apply highlight group to range of text.
@@ -39,7 +39,7 @@ M.priorities = {
 ---@param higroup string Highlight group to use for highlighting
 ---@param start integer[]|string Start of region as a (line, column) tuple or string accepted by |getpos()|
 ---@param finish integer[]|string End of region as a (line, column) tuple or string accepted by |getpos()|
----@param opts? vim.highlight.range.Opts
+---@param opts? vim.hl.range.Opts
 function M.range(bufnr, ns, higroup, start, finish, opts)
   opts = opts or {}
   local regtype = opts.regtype or 'v'
@@ -124,7 +124,7 @@ local yank_cancel --- @type fun()?
 --- Add the following to your `init.vim`:
 ---
 --- ```vim
---- autocmd TextYankPost * silent! lua vim.highlight.on_yank {higroup='Visual', timeout=300}
+--- autocmd TextYankPost * silent! lua vim.hl.on_yank {higroup='Visual', timeout=300}
 --- ```
 ---
 --- @param opts table|nil Optional parameters
@@ -133,7 +133,7 @@ local yank_cancel --- @type fun()?
 ---              - on_macro  highlight when executing macro (default false)
 ---              - on_visual highlight when yanking visual selection (default true)
 ---              - event     event structure (default vim.v.event)
----              - priority  integer priority (default |vim.highlight.priorities|`.user`)
+---              - priority  integer priority (default |vim.hl.priorities|`.user`)
 function M.on_yank(opts)
   vim.validate({
     opts = {
@@ -145,7 +145,7 @@ function M.on_yank(opts)
           return type(t) == 'table'
         end
       end,
-      'a table or nil to configure options (see `:h highlight.on_yank`)',
+      'a table or nil to configure options (see `:h vim.hl.on_yank`)',
     },
   })
   opts = opts or {}
diff --git a/runtime/lua/vim/lsp/handlers.lua b/runtime/lua/vim/lsp/handlers.lua
index c87cf94b98..37cb07025c 100644
--- a/runtime/lua/vim/lsp/handlers.lua
+++ b/runtime/lua/vim/lsp/handlers.lua
@@ -437,7 +437,7 @@ function M.signature_help(_, result, ctx, config)
   local fbuf, fwin = util.open_floating_preview(lines, 'markdown', config)
   -- Highlight the active parameter.
   if hl then
-    vim.highlight.range(
+    vim.hl.range(
       fbuf,
       sig_help_ns,
       'LspSignatureActiveParameter',
diff --git a/runtime/lua/vim/lsp/semantic_tokens.lua b/runtime/lua/vim/lsp/semantic_tokens.lua
index 2c7958b0d5..0f6e45c330 100644
--- a/runtime/lua/vim/lsp/semantic_tokens.lua
+++ b/runtime/lua/vim/lsp/semantic_tokens.lua
@@ -443,7 +443,7 @@ function STHighlighter:on_win(topline, botline)
         vim.api.nvim_buf_set_extmark(self.bufnr, state.namespace, token.line, token.start_col, {
           hl_group = hl_group,
           end_col = token.end_col,
-          priority = vim.highlight.priorities.semantic_tokens + delta,
+          priority = vim.hl.priorities.semantic_tokens + delta,
           strict = false,
         })
       end
@@ -723,7 +723,7 @@ end
 --- @inlinedoc
 ---
 --- Priority for the applied extmark.
---- (Default: `vim.highlight.priorities.semantic_tokens + 3`)
+--- (Default: `vim.hl.priorities.semantic_tokens + 3`)
 --- @field priority? integer
 
 --- Highlight a semantic token.
@@ -752,7 +752,7 @@ function M.highlight_token(token, bufnr, client_id, hl_group, opts)
   end
 
   opts = opts or {}
-  local priority = opts.priority or vim.highlight.priorities.semantic_tokens + 3
+  local priority = opts.priority or vim.hl.priorities.semantic_tokens + 3
 
   vim.api.nvim_buf_set_extmark(bufnr, state.namespace, token.line, token.start_col, {
     hl_group = hl_group,
diff --git a/runtime/lua/vim/lsp/util.lua b/runtime/lua/vim/lsp/util.lua
index 2c28633e3c..2e9c71cf38 100644
--- a/runtime/lua/vim/lsp/util.lua
+++ b/runtime/lua/vim/lsp/util.lua
@@ -2,7 +2,6 @@ local protocol = require('vim.lsp.protocol')
 local validate = vim.validate
 local api = vim.api
 local list_extend = vim.list_extend
-local highlight = vim.highlight
 local uv = vim.uv
 
 local M = {}
@@ -1716,13 +1715,13 @@ do --[[ References ]]
         [protocol.DocumentHighlightKind.Write] = 'LspReferenceWrite',
       }
       local kind = reference['kind'] or protocol.DocumentHighlightKind.Text
-      highlight.range(
+      vim.hl.range(
         bufnr,
         reference_ns,
         document_highlight_kind[kind],
         { start_line, start_idx },
         { end_line, end_idx },
-        { priority = vim.highlight.priorities.user }
+        { priority = vim.hl.priorities.user }
       )
     end
   end
diff --git a/runtime/lua/vim/treesitter/highlighter.lua b/runtime/lua/vim/treesitter/highlighter.lua
index a94c408f4e..7bdcdc774a 100644
--- a/runtime/lua/vim/treesitter/highlighter.lua
+++ b/runtime/lua/vim/treesitter/highlighter.lua
@@ -328,7 +328,7 @@ local function on_line_impl(self, buf, line, is_spell_nav)
         -- The "priority" attribute can be set at the pattern level or on a particular capture
         local priority = (
           tonumber(metadata.priority or metadata[capture] and metadata[capture].priority)
-          or vim.highlight.priorities.treesitter
+          or vim.hl.priorities.treesitter
         ) + spell_pri_offset
 
         -- The "conceal" attribute can be set at the pattern level or on a particular capture