docs: make_entry and entry_display

lua/telescope/pickers/entry_display.lua

@@ -1,3 +1,63 @@
+---@tag telescope.pickers.entry_display
+
+---@brief [[
+--- Entry Display is used to format each entry shown in the result panel.
+---
+--- Entry Display create() will give us a function based on the configuration
+--- of column widths we pass into it. We then can use this function n times to
+--- return a string based on structured input.
+---
+--- Note that if you call `create()` inside `make_display` it will be called for
+--- every single entry. So it is suggested to do this outside of `make_display`
+--- for the best performance.
+---
+--- The create function will use the column widths passed to it in
+--- configaration.items. Each item in that table is the number of characters in
+--- the column. It's also possible for the final column to not have a fixed
+--- width, this will be shown in the configuartion as 'remaining = true'.
+---
+--- An example of this configuration is shown for the buffers picker
+--- <code>
+--- local displayer = entry_display.create {
+---   separator = " ",
+---   items = {
+---     { width = opts.bufnr_width },
+---     { width = 4 },
+---     { width = icon_width },
+---     { remaining = true },
+---   },
+--- }
+--- </code>
+---
+--- This shows 4 columns, the first is defined in the opts as the width we'll
+--- use when display_string the number of the buffer. The second has a fixed
+--- width of 4 and the 3rd column's widht will be decided by the width of the
+--- icons we use. The fourth column will use the remaining space. Finally we
+--- have also defined the seperator between each column will be the space " ".
+---
+--- An example of how the display reference will be used is shown, again for
+--- the buffers picker:
+--- <code>
+--- return displayer {
+---   { entry.bufnr, "TelescopeResultsNumber" },
+---   { entry.indicator, "TelescopeResultsComment" },
+---   { icon, hl_group },
+---   display_bufname .. ":" .. entry.lnum,
+--- }
+--- </code>
+---
+--- There are two types of values each column can have. Either a simple String
+--- or a table containing the String as well as the hl_group.
+---
+--- The displayer can return values, string and an optional highlights.
+--- String is all the text to be displayed for this entry as a single string. If
+--- parts of the string are to be highlighted they will be described in the
+--- highlights table.
+---
+--- For better understanding of how create() and displayer are used it's best to look
+--- at the code in make_entry.lua.
+---@brief ]]
+
 local strings = require "plenary.strings"
 local state = require "telescope.state"
 local resolve = require "telescope.config.resolve"