chore: use plenary.strings and remove strings functions from utils (#690)

Co-authored-by: Simon Hauser <Simon-Hauser@outlook.de>

lua/telescope/utils.lua

@@ -377,94 +377,20 @@ function utils.get_os_command_output(cmd, cwd)
   return stdout, ret, stderr
 end
 
-utils.strdisplaywidth = (function()
-  if jit and pathlib.separator ~= '\\' then
-    local ffi = require('ffi')
-    ffi.cdef[[
-      typedef unsigned char char_u;
-      int linetabsize_col(int startcol, char_u *s);
-    ]]
-
-    return function(str, col)
-      local startcol = col or 0
-      str = tostring(str)
-      local s = ffi.new('char[?]', #str + 1)
-      ffi.copy(s, str)
-      return ffi.C.linetabsize_col(startcol, s) - startcol
-    end
-  else
-    return function(str, col)
-      return #(tostring(str)) - (col or 0)
-    end
-  end
-end)()
-
-utils.utf_ptr2len = (function()
-  if jit and pathlib.separator ~= '\\' then
-    local ffi = require('ffi')
-    ffi.cdef[[
-      typedef unsigned char char_u;
-      int utf_ptr2len(const char_u *const p);
-    ]]
-
-    return function(str)
-      local c_str = ffi.new('char[?]', #str + 1)
-      ffi.copy(c_str, str)
-      return ffi.C.utf_ptr2len(c_str)
-    end
-  else
-    return function(str)
-      return str == '' and 0 or 1
-    end
-  end
-end)()
-
-function utils.strcharpart(str, nchar, charlen)
-  local nbyte = 0
-  if nchar > 0 then
-    while nchar > 0 and nbyte < #str do
-      nbyte = nbyte + utils.utf_ptr2len(str:sub(nbyte + 1))
-      nchar = nchar - 1
-    end
-  else
-    nbyte = nchar
-  end
-
-  local len = 0
-  if charlen then
-    while charlen > 0 and nbyte + len < #str do
-      local off = nbyte + len
-      if off < 0 then
-        len = len + 1
-      else
-        len = len + utils.utf_ptr2len(str:sub(off + 1))
-      end
-      charlen = charlen - 1
-    end
-  else
-    len = #str - nbyte
-  end
-
-  if nbyte < 0 then
-    len = len + nbyte
-    nbyte = 0
-  elseif nbyte > #str then
-    nbyte = #str
-  end
-  if len < 0 then
-    len = 0
-  elseif nbyte + len > #str then
-    len = #str - nbyte
-  end
-
-  return str:sub(nbyte + 1, nbyte + len)
+utils.strdisplaywidth = function()
+  error("strdisplaywidth deprecated. please use plenary.strings.strdisplaywidth")
 end
 
-utils.align_str = function(string, width, right_justify)
-  local str_len = utils.strdisplaywidth(string)
-  return right_justify
-    and string.rep(" ", width - str_len)..string
-    or string..string.rep(" ", width - str_len)
+utils.utf_ptr2len = function()
+  error("utf_ptr2len deprecated. please use plenary.strings.utf_ptr2len")
+end
+
+utils.strcharpart = function()
+  error("strcharpart deprecated. please use plenary.strings.strcharpart")
+end
+
+utils.align_str = function()
+  error("align_str deprecated. please use plenary.strings.align_str")
 end
 
 utils.transform_devicons = (function()