feat(text): multiline support and pattern highlights

Author: folke

lua/lazy/view/text.lua

@@ -1,9 +1,11 @@
 local Config = require("lazy.core.config")
 
----@alias TextSegment {str: string, hl?:string, extmark?:table}
+---@alias TextSegment {str: string, hl?:string|Extmark}
+---@alias Extmark {hl_group?:string, col?:number, end_col?:number}
 
 ---@class Text
 ---@field _lines TextSegment[][]
+---@field padding number
 local Text = {}
 
 function Text.new()
@@ -16,17 +18,30 @@ function Text.new()
 end
 
 ---@param str string
----@param hl? string|table
-function Text:append(str, hl)
+---@param hl? string|Extmark
+---@param opts? {indent?: number, prefix?: string}
+function Text:append(str, hl, opts)
+  opts = opts or {}
   if #self._lines == 0 then
     self:nl()
   end
 
-  table.insert(self._lines[#self._lines], {
-    str = str,
-    hl = type(hl) == "string" and hl or nil,
-    extmark = type(hl) == "table" and hl or nil,
-  })
+  local lines = vim.split(str, "\n")
+  for l, line in ipairs(lines) do
+    if opts.prefix then
+      line = opts.prefix .. line
+    end
+    if opts.indent then
+      line = string.rep(" ", opts.indent) .. line
+    end
+    if l > 1 then
+      self:nl()
+    end
+    table.insert(self._lines[#self._lines], {
+      str = line,
+      hl = hl,
+    })
+  end
 
   return self
 end
@@ -36,12 +51,11 @@ function Text:nl()
   return self
 end
 
-function Text:render(buf, padding)
-  padding = padding or 0
+function Text:render(buf)
   local lines = {}
 
   for _, line in ipairs(self._lines) do
-    local str = (" "):rep(padding)
+    local str = (" "):rep(self.padding)
 
     for _, segment in ipairs(line) do
       str = str .. segment.str
@@ -53,27 +67,59 @@ function Text:render(buf, padding)
   vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
 
   for l, line in ipairs(self._lines) do
-    local col = padding
+    local col = self.padding
 
     for _, segment in ipairs(line) do
       local width = vim.fn.strlen(segment.str)
 
-      if segment.hl then
-        vim.api.nvim_buf_set_extmark(buf, Config.ns, l - 1, col, {
-          hl_group = segment.hl,
-          end_col = col + width,
-        })
-      end
+      local extmark = segment.hl
+      if extmark then
+        if type(extmark) == "string" then
+          extmark = { hl_group = extmark, end_col = col + width }
+        end
+        ---@cast extmark Extmark
 
-      if segment.extmark then
-        vim.api.nvim_buf_set_extmark(buf, Config.ns, l - 1, col, segment.extmark)
+        local extmark_col = extmark.col or col
+        extmark.col = nil
+        vim.api.nvim_buf_set_extmark(buf, Config.ns, l - 1, extmark_col, extmark)
       end
 
       col = col + width
     end
   end
 end
 
+---@param patterns table<string,string>
+function Text:highlight(patterns)
+  local col = self.padding
+  local last = self._lines[#self._lines]
+  ---@type TextSegment?
+  local text
+  for s, segment in ipairs(last) do
+    if s == #last then
+      text = segment
+      break
+    end
+    col = col + vim.fn.strlen(segment.str)
+  end
+  if text then
+    for pattern, hl in pairs(patterns) do
+      local from, to, match = text.str:find(pattern)
+      while from do
+        if match then
+          from, to = text.str:find(match, from, true)
+        end
+        self:append("", {
+          col = col + from - 1,
+          end_col = col + to,
+          hl_group = hl,
+        })
+        from, to = text.str:find(pattern, to + 1)
+      end
+    end
+  end
+end
+
 function Text:trim()
   while #self._lines > 0 and #self._lines[1] == 0 do
     table.remove(self._lines, 1)