feat: truncate option for path_display (#1254)

doc/telescope.txt

@@ -191,6 +191,8 @@ telescope.setup({opts})                                    *telescope.setup()*
                       the difference between the displayed paths
         - "shorten"   only display the first character of each directory in
                       the path
+        - "truncate"  truncates the start of the path when the whole path will
+                      not fit
 
         You can also specify the number of characters of each directory name
         to keep by setting `path_display.shorten = num`.

lua/telescope/config.lua

@@ -256,6 +256,8 @@ append(
                 the difference between the displayed paths
   - "shorten"   only display the first character of each directory in
                 the path
+  - "truncate"  truncates the start of the path when the whole path will
+                not fit
 
   You can also specify the number of characters of each directory name
   to keep by setting `path_display.shorten = num`.

lua/telescope/make_entry.lua

@@ -330,6 +330,7 @@ end
 
 function make_entry.gen_from_lsp_symbols(opts)
   opts = opts or {}
+
   local bufnr = opts.bufnr or vim.api.nvim_get_current_buf()
 
   local display_items = {
@@ -932,6 +933,7 @@ end
 
 function make_entry.gen_from_lsp_diagnostics(opts)
   opts = opts or {}
+
   local lsp_type_diagnostic = vim.lsp.protocol.DiagnosticSeverity
 
   local signs

lua/telescope/utils.lua

@@ -3,6 +3,9 @@ local Job = require "plenary.job"
 
 local log = require "telescope.log"
 
+local truncate = require("plenary.strings").truncate
+local get_status = require("telescope.state").get_status
+
 local utils = {}
 
 utils.get_separator = function()
@@ -326,6 +329,11 @@ local is_uri = function(filename)
   return string.match(filename, "^%w+://") ~= nil
 end
 
+local calc_result_length = function()
+  local status = get_status(vim.api.nvim_get_current_buf())
+  return vim.api.nvim_win_get_width(status.results_win) - status.picker.selection_caret:len() - 2
+end
+
 utils.transform_path = function(opts, path)
   if is_uri(path) then
     return path
@@ -361,6 +369,12 @@ utils.transform_path = function(opts, path)
       if vim.tbl_contains(path_display, "shorten") or path_display["shorten"] ~= nil then
         transformed_path = Path:new(transformed_path):shorten(path_display["shorten"])
       end
+      if vim.tbl_contains(path_display, "truncate") or path_display.truncate then
+        if opts.__length == nil then
+          opts.__length = calc_result_length()
+        end
+        transformed_path = truncate(transformed_path, opts.__length, nil, -1)
+      end
     end
 
     return transformed_path