fix: previewers & entry maker file encoding

lua/telescope/builtin/init.lua

@@ -55,6 +55,7 @@ end
 ---@field additional_args function|table: additional arguments to be passed on. Can be fn(opts) -> tbl
 ---@field max_results number: define a upper result value
 ---@field disable_coordinates boolean: don't show the line & row numbers (default: false)
+---@field file_encoding string: file encoding for the entry & previewer
 builtin.live_grep = require_on_exported_call("telescope.builtin.__files").live_grep
 
 --- Searches for the string under your cursor or the visual selection in your current working directory
@@ -68,6 +69,7 @@ builtin.live_grep = require_on_exported_call("telescope.builtin.__files").live_g
 ---@field additional_args function|table: additional arguments to be passed on. Can be fn(opts) -> tbl
 ---@field disable_coordinates boolean: don't show the line and row numbers (default: false)
 ---@field only_sort_text boolean: only sort the text, not the file, line or row (default: false)
+---@field file_encoding string: file encoding for the entry & previewer
 builtin.grep_string = require_on_exported_call("telescope.builtin.__files").grep_string
 
 --- Search for files (respecting .gitignore)
@@ -81,6 +83,7 @@ builtin.grep_string = require_on_exported_call("telescope.builtin.__files").grep
 ---@field no_ignore_parent boolean: show files ignored by .gitignore, .ignore, etc. in parent dirs. (default: false)
 ---@field search_dirs table: directory/directories/files to search
 ---@field search_file string: specify a filename to search for
+---@field file_encoding string: file encoding for the previewer
 builtin.find_files = require_on_exported_call("telescope.builtin.__files").find_files
 
 --- This is an alias for the `find_files` picker
@@ -92,11 +95,13 @@ builtin.fd = builtin.find_files
 ---@field show_line boolean: if true, shows the row:column that the result is found at (default: true)
 ---@field bufnr number: specify the buffer number where treesitter should run. (default: current buffer)
 ---@field symbol_highlights table: string -> string. Matches symbol with hl_group
+---@field file_encoding string: file encoding for the previewer
 builtin.treesitter = require_on_exported_call("telescope.builtin.__files").treesitter
 
 --- Live fuzzy search inside of the currently open buffer
 ---@param opts table: options to pass to the picker
 ---@field skip_empty_lines boolean: if true we don't display empty lines (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.current_buffer_fuzzy_find = require_on_exported_call("telescope.builtin.__files").current_buffer_fuzzy_find
 
 --- Lists tags in current directory with tag location file preview (users are required to run ctags -R to generate tags
@@ -134,6 +139,7 @@ builtin.current_buffer_tags = require_on_exported_call("telescope.builtin.__file
 ---@field show_untracked boolean: if true, adds `--others` flag to command and shows untracked files (default: false)
 ---@field recurse_submodules boolean: if true, adds the `--recurse-submodules` flag to command (default: false)
 ---@field git_command table: command that will be executed. {"git","ls-files","--exclude-standard","--cached"}
+---@field file_encoding string: file encoding for the previewer
 builtin.git_files = require_on_exported_call("telescope.builtin.__git").files
 
 --- Lists commits for current directory with diff preview
@@ -268,6 +274,7 @@ builtin.loclist = require_on_exported_call("telescope.builtin.__internal").locli
 ---@field cwd string: specify a working directory to filter oldfiles by
 ---@field only_cwd boolean: show only files in the cwd (default: false)
 ---@field cwd_only boolean: alias for only_cwd
+---@field file_encoding string: file encoding for the previewer
 builtin.oldfiles = require_on_exported_call("telescope.builtin.__internal").oldfiles
 
 --- Lists commands that were executed recently, and reruns them on `<cr>`
@@ -314,6 +321,7 @@ builtin.reloader = require_on_exported_call("telescope.builtin.__internal").relo
 ---@field sort_lastused boolean: Sorts current and last buffer to the top and selects the lastused (default: false)
 ---@field sort_mru boolean: Sorts all buffers after most recent used. Not just the current and last one (default: false)
 ---@field bufnr_width number: Defines the width of the buffer numbers in front of the filenames  (default: dynamic)
+---@field file_encoding string: file encoding for the previewer
 builtin.buffers = require_on_exported_call("telescope.builtin.__internal").buffers
 
 --- Lists available colorschemes and applies them on `<cr>`
@@ -323,6 +331,7 @@ builtin.colorscheme = require_on_exported_call("telescope.builtin.__internal").c
 
 --- Lists vim marks and their value, jumps to the mark on `<cr>`
 ---@param opts table: options to pass to the picker
+---@field file_encoding string: file encoding for the previewer
 builtin.marks = require_on_exported_call("telescope.builtin.__internal").marks
 
 --- Lists vim registers, pastes the contents of the register on `<cr>`
@@ -383,20 +392,23 @@ builtin.jumplist = require_on_exported_call("telescope.builtin.__internal").jump
 ---@field fname_width number: defines the width of the filename section (default: 30)
 ---@field show_line boolean: show results text (default: true)
 ---@field trim_text boolean: trim results text (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_references = require_on_exported_call("telescope.builtin.__lsp").references
 
 --- Lists LSP incoming calls for word under the cursor, jumps to reference on `<cr>`
 ---@param opts table: options to pass to the picker
 ---@field fname_width number: defines the width of the filename section (default: 30)
 ---@field show_line boolean: show results text (default: true)
 ---@field trim_text boolean: trim results text (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_incoming_calls = require_on_exported_call("telescope.builtin.__lsp").incoming_calls
 
 --- Lists LSP outgoing calls for word under the cursor, jumps to reference on `<cr>`
 ---@param opts table: options to pass to the picker
 ---@field fname_width number: defines the width of the filename section (default: 30)
 ---@field show_line boolean: show results text (default: true)
 ---@field trim_text boolean: trim results text (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_outgoing_calls = require_on_exported_call("telescope.builtin.__lsp").outgoing_calls
 
 --- Goto the definition of the word under the cursor, if there's only one, otherwise show all options in Telescope
@@ -405,6 +417,7 @@ builtin.lsp_outgoing_calls = require_on_exported_call("telescope.builtin.__lsp")
 ---@field fname_width number: defines the width of the filename section (default: 30)
 ---@field show_line boolean: show results text (default: true)
 ---@field trim_text boolean: trim results text (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_definitions = require_on_exported_call("telescope.builtin.__lsp").definitions
 
 --- Goto the definition of the type of the word under the cursor, if there's only one,
@@ -414,6 +427,7 @@ builtin.lsp_definitions = require_on_exported_call("telescope.builtin.__lsp").de
 ---@field fname_width number: defines the width of the filename section (default: 30)
 ---@field show_line boolean: show results text (default: true)
 ---@field trim_text boolean: trim results text (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_type_definitions = require("telescope.builtin.__lsp").type_definitions
 
 --- Goto the implementation of the word under the cursor if there's only one, otherwise show all options in Telescope
@@ -422,6 +436,7 @@ builtin.lsp_type_definitions = require("telescope.builtin.__lsp").type_definitio
 ---@field fname_width number: defines the width of the filename section (default: 30)
 ---@field show_line boolean: show results text (default: true)
 ---@field trim_text boolean: trim results text (default: false)
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_implementations = require_on_exported_call("telescope.builtin.__lsp").implementations
 
 --- Lists LSP document symbols in the current buffer
@@ -435,6 +450,7 @@ builtin.lsp_implementations = require_on_exported_call("telescope.builtin.__lsp"
 ---@field symbols string|table: filter results by symbol kind(s)
 ---@field ignore_symbols string|table: list of symbols to ignore
 ---@field symbol_highlights table: string -> string. Matches symbol with hl_group
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_document_symbols = require_on_exported_call("telescope.builtin.__lsp").document_symbols
 
 --- Lists LSP document symbols in the current workspace
@@ -449,6 +465,7 @@ builtin.lsp_document_symbols = require_on_exported_call("telescope.builtin.__lsp
 ---@field symbols string|table: filter results by symbol kind(s)
 ---@field ignore_symbols string|table: list of symbols to ignore
 ---@field symbol_highlights table: string -> string. Matches symbol with hl_group
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_workspace_symbols = require_on_exported_call("telescope.builtin.__lsp").workspace_symbols
 
 --- Dynamically lists LSP for all workspace symbols
@@ -460,6 +477,7 @@ builtin.lsp_workspace_symbols = require_on_exported_call("telescope.builtin.__ls
 ---@field symbols string|table: filter results by symbol kind(s)
 ---@field ignore_symbols string|table: list of symbols to ignore
 ---@field symbol_highlights table: string -> string. Matches symbol with hl_group
+---@field file_encoding string: file encoding for the previewer
 builtin.lsp_dynamic_workspace_symbols = require_on_exported_call("telescope.builtin.__lsp").dynamic_workspace_symbols
 
 --

lua/telescope/make_entry.lua

@@ -326,9 +326,10 @@ do
           end
         end
 
+        local text = opts.file_encoding and vim.iconv(entry.text, opts.file_encoding, "utf8") or entry.text
         local display, hl_group = utils.transform_devicons(
           entry.filename,
-          string.format(display_string, display_filename, coordinates, entry.text),
+          string.format(display_string, display_filename, coordinates, text),
           disable_devicons
         )
 

lua/telescope/previewers/buffer_previewer.lua

@@ -59,8 +59,10 @@ end
 local function split(s, sep, plain, opts)
   opts = opts or {}
   local t = {}
+  local line
   for c in vim.gsplit(s, sep, plain) do
-    table.insert(t, c)
+    line = opts.file_encoding and vim.iconv(c, opts.file_encoding, "utf8") or c
+    table.insert(t, line)
     if opts.preview.timeout then
       local diff_time = (vim.loop.hrtime() - opts.start_time) / 1e6
       if diff_time > opts.preview.timeout then
@@ -433,6 +435,7 @@ previewers.cat = defaulter(function(opts)
         bufname = self.state.bufname,
         winid = self.state.winid,
         preview = opts.preview,
+        file_encoding = opts.file_encoding,
       })
     end,
   }
@@ -487,6 +490,7 @@ previewers.vimgrep = defaulter(function(opts)
           callback = function(bufnr)
             jump_to_line(self, bufnr, entry.lnum)
           end,
+          file_encoding = opts.file_encoding,
         })
       end
     end,