feat(picker): syntax highlighting for command and search history

lua/snacks/picker/config/defaults.lua

@@ -118,6 +118,9 @@ local defaults = {
   ui_select = true, -- replace `vim.ui.select` with the snacks picker
   ---@class snacks.picker.formatters.Config
   formatters = {
+    text = {
+      ft = nil, ---@type string? filetype for highlighting
+    },
     file = {
       filename_first = false, -- display filename before the file path
     },

lua/snacks/picker/config/sources.lua

@@ -71,6 +71,7 @@ M.command_history = {
     preset = "vscode",
   },
   confirm = "cmd",
+  formatters = { text = { ft = "vim" } },
 }
 
 -- Neovim commands
@@ -549,10 +550,9 @@ M.search_history = {
   name = "search",
   format = "text",
   preview = "none",
-  layout = {
-    preset = "vscode",
-  },
+  layout = { preset = "vscode" },
   confirm = "search",
+  formatters = { text = { ft = "regex" } },
 }
 
 ---@class snacks.picker.smart.Config: snacks.picker.Config

lua/snacks/picker/format.lua

@@ -275,10 +275,15 @@ function M.lines(item)
   return ret
 end
 
-function M.text(item)
-  return {
-    { item.text },
-  }
+function M.text(item, picker)
+  local ret = {} ---@type snacks.picker.Highlight[]
+  local ft = item.ft or picker.opts.formatters.text.ft
+  if ft then
+    Snacks.picker.highlight.format(item, item.text, ret, { lang = ft })
+  else
+    ret[#ret + 1] = { item.text }
+  end
+  return ret
 end
 
 function M.command(item)