Files
telescope.nvim/lua/telescope/previewers/buffer_previewer.lua
T

876 lines
26 KiB
Lua

local from_entry = require "telescope.from_entry"
local Path = require "plenary.path"
local utils = require "telescope.utils"
local putils = require "telescope.previewers.utils"
local Previewer = require "telescope.previewers.previewer"
local conf = require("telescope.config").values
local pfiletype = require "plenary.filetype"
local pscan = require "plenary.scandir"
local buf_delete = utils.buf_delete
local defaulter = utils.make_default_callable
local previewers = {}
local ns_previewer = vim.api.nvim_create_namespace "telescope.previewers"
local color_hash = {
["p"] = "TelescopePreviewPipe",
["c"] = "TelescopePreviewCharDev",
["d"] = "TelescopePreviewDirectory",
["b"] = "TelescopePreviewBlock",
["l"] = "TelescopePreviewLink",
["s"] = "TelescopePreviewSocket",
["."] = "TelescopePreviewNormal",
["r"] = "TelescopePreviewRead",
["w"] = "TelescopePreviewWrite",
["x"] = "TelescopePreviewExecute",
["-"] = "TelescopePreviewHyphen",
["T"] = "TelescopePreviewSticky",
["S"] = "TelescopePreviewSticky",
[2] = "TelescopePreviewSize",
[3] = "TelescopePreviewUser",
[4] = "TelescopePreviewGroup",
[5] = "TelescopePreviewDate",
}
color_hash[6] = function(line)
return color_hash[line:sub(1, 1)]
end
local colorize_ls = function(bufnr, data, sections)
local windows_add = Path.path.sep == "\\" and 2 or 0
for lnum, line in ipairs(data) do
local section = sections[lnum]
for i = 1, section[1].end_index - 1 do -- Highlight permissions
local c = line:sub(i, i)
vim.api.nvim_buf_add_highlight(bufnr, ns_previewer, color_hash[c], lnum - 1, i - 1, i)
end
for i = 2, #section do -- highlights size, (user, group), date and name
local hl_group = color_hash[i + (i ~= 2 and windows_add or 0)]
vim.api.nvim_buf_add_highlight(
bufnr,
ns_previewer,
type(hl_group) == "function" and hl_group(line) or hl_group,
lnum - 1,
section[i].start_index - 1,
section[i].end_index - 1
)
end
end
end
local search_cb_jump = function(self, bufnr, query)
if not query then
return
end
vim.api.nvim_buf_call(bufnr, function()
pcall(vim.fn.matchdelete, self.state.hl_id, self.state.winid)
vim.cmd "norm! gg"
vim.fn.search(query, "W")
vim.cmd "norm! zz"
self.state.hl_id = vim.fn.matchadd("TelescopePreviewMatch", query)
end)
end
local search_teardown = function(self)
if self.state and self.state.hl_id then
pcall(vim.fn.matchdelete, self.state.hl_id, self.state.hl_win)
self.state.hl_id = nil
end
end
previewers.file_maker = function(filepath, bufnr, opts)
opts = opts or {}
if opts.use_ft_detect == nil then
opts.use_ft_detect = true
end
local ft = opts.use_ft_detect and pfiletype.detect(filepath)
if opts.bufname ~= filepath then
if not vim.in_fast_event() then
filepath = vim.fn.expand(filepath)
end
vim.loop.fs_stat(filepath, function(_, stat)
if not stat then
return
end
if stat.type == "directory" then
pscan.ls_async(filepath, {
hidden = true,
group_directories_first = true,
on_exit = vim.schedule_wrap(function(data, sections)
vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, data)
colorize_ls(bufnr, data, sections)
if opts.callback then
opts.callback(bufnr)
end
end),
})
else
Path:new(filepath):_read_async(vim.schedule_wrap(function(data)
if not vim.api.nvim_buf_is_valid(bufnr) then
return
end
local ok = pcall(vim.api.nvim_buf_set_lines, bufnr, 0, -1, false, vim.split(data, "[\r]?\n"))
if not ok then
return
end
if opts.callback then
opts.callback(bufnr)
end
putils.highlighter(bufnr, ft)
end))
end
end)
else
if opts.callback then
if vim.in_fast_event() then
vim.schedule(function()
opts.callback(bufnr)
end)
else
opts.callback(bufnr)
end
end
end
end
previewers.new_buffer_previewer = function(opts)
opts = opts or {}
assert(opts.define_preview, "define_preview is a required function")
assert(not opts.preview_fn, "preview_fn not allowed")
local opt_setup = opts.setup
local opt_teardown = opts.teardown
local opt_title = opts.title
local opt_dyn_title = opts.dyn_title
local old_bufs = {}
local bufname_table = {}
local global_state = require "telescope.state"
local preview_window_id
local function get_bufnr(self)
if not self.state then
return nil
end
return self.state.bufnr
end
local function set_bufnr(self, value)
if self.state then
self.state.bufnr = value
table.insert(old_bufs, value)
end
end
local function get_bufnr_by_bufname(self, value)
if not self.state then
return nil
end
return bufname_table[value]
end
local function set_bufname(self, value)
if self.state then
self.state.bufname = value
if value then
bufname_table[value] = get_bufnr(self)
end
end
end
function opts.title(self)
if opt_title then
if type(opt_title) == "function" then
return opt_title(self)
else
return opt_title
end
end
return "Preview"
end
function opts.dyn_title(self, entry)
if opt_dyn_title then
return opt_dyn_title(self, entry)
end
return "Preview"
end
function opts.setup(self)
local state = {}
if opt_setup then
vim.tbl_deep_extend("force", state, opt_setup(self))
end
return state
end
function opts.teardown(self)
if opt_teardown then
opt_teardown(self)
end
local last_nr
if opts.keep_last_buf then
last_nr = global_state.get_global_key "last_preview_bufnr"
-- Push in another buffer so the last one will not be cleaned up
if preview_window_id then
local bufnr = vim.api.nvim_create_buf(false, true)
vim.api.nvim_win_set_buf(preview_window_id, bufnr)
end
end
set_bufnr(self, nil)
set_bufname(self, nil)
for _, bufnr in ipairs(old_bufs) do
if bufnr ~= last_nr then
buf_delete(bufnr)
end
end
end
function opts.preview_fn(self, entry, status)
if get_bufnr(self) == nil then
set_bufnr(self, vim.api.nvim_win_get_buf(status.preview_win))
preview_window_id = status.preview_win
end
if opts.get_buffer_by_name and get_bufnr_by_bufname(self, opts.get_buffer_by_name(self, entry)) then
self.state.bufname = opts.get_buffer_by_name(self, entry)
self.state.bufnr = get_bufnr_by_bufname(self, self.state.bufname)
vim.api.nvim_win_set_buf(status.preview_win, self.state.bufnr)
else
local bufnr = vim.api.nvim_create_buf(false, true)
set_bufnr(self, bufnr)
vim.schedule(function()
if vim.api.nvim_buf_is_valid(bufnr) then
vim.api.nvim_win_set_buf(status.preview_win, bufnr)
end
end)
-- TODO(conni2461): We only have to set options once. Right?
vim.api.nvim_win_set_option(status.preview_win, "winhl", "Normal:TelescopePreviewNormal")
vim.api.nvim_win_set_option(status.preview_win, "signcolumn", "no")
vim.api.nvim_win_set_option(status.preview_win, "foldlevel", 100)
vim.api.nvim_win_set_option(status.preview_win, "wrap", false)
self.state.winid = status.preview_win
self.state.bufname = nil
end
if opts.keep_last_buf then
global_state.set_global_key("last_preview_bufnr", self.state.bufnr)
end
opts.define_preview(self, entry, status)
putils.with_preview_window(status, nil, function()
vim.cmd "do User TelescopePreviewerLoaded"
end)
if opts.get_buffer_by_name then
set_bufname(self, opts.get_buffer_by_name(self, entry))
end
end
if not opts.scroll_fn then
function opts.scroll_fn(self, direction)
if not self.state then
return
end
local input = direction > 0 and [[]] or [[]]
local count = math.abs(direction)
vim.api.nvim_buf_call(self.state.bufnr, function()
vim.cmd([[normal! ]] .. count .. input)
end)
end
end
return Previewer:new(opts)
end
previewers.cat = defaulter(function(opts)
opts = opts or {}
local cwd = opts.cwd or vim.loop.cwd()
return previewers.new_buffer_previewer {
title = "File Preview",
dyn_title = function(_, entry)
return Path:new(from_entry.path(entry, true)):normalize(cwd)
end,
get_buffer_by_name = function(_, entry)
return from_entry.path(entry, true)
end,
define_preview = function(self, entry, status)
local p = from_entry.path(entry, true)
if p == nil or p == "" then
return
end
conf.buffer_previewer_maker(p, self.state.bufnr, {
bufname = self.state.bufname,
})
end,
}
end, {})
previewers.vimgrep = defaulter(function(opts)
opts = opts or {}
local cwd = opts.cwd or vim.loop.cwd()
local jump_to_line = function(self, bufnr, lnum)
if lnum and lnum > 0 then
pcall(vim.api.nvim_buf_add_highlight, bufnr, ns_previewer, "TelescopePreviewLine", lnum - 1, 0, -1)
pcall(vim.api.nvim_win_set_cursor, self.state.winid, { lnum, 0 })
vim.api.nvim_buf_call(bufnr, function()
vim.cmd "norm! zz"
end)
end
self.state.last_set_bufnr = bufnr
end
return previewers.new_buffer_previewer {
title = "Grep Preview",
dyn_title = function(_, entry)
return Path:new(from_entry.path(entry, true)):normalize(cwd)
end,
setup = function()
return { last_set_bufnr = nil }
end,
teardown = function(self)
if self.state and self.state.last_set_bufnr and vim.api.nvim_buf_is_valid(self.state.last_set_bufnr) then
vim.api.nvim_buf_clear_namespace(self.state.last_set_bufnr, ns_previewer, 0, -1)
end
end,
get_buffer_by_name = function(_, entry)
return from_entry.path(entry, true)
end,
define_preview = function(self, entry, status)
local p = from_entry.path(entry, true)
if p == nil or p == "" then
return
end
if self.state.last_set_bufnr then
pcall(vim.api.nvim_buf_clear_namespace, self.state.last_set_bufnr, ns_previewer, 0, -1)
end
-- Workaround for unnamed buffer when using builtin.buffer
if entry.bufnr and (p == "[No Name]" or vim.api.nvim_buf_get_option(entry.bufnr, "buftype") ~= "") then
local lines = vim.api.nvim_buf_get_lines(entry.bufnr, 0, -1, false)
vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, lines)
jump_to_line(self, self.state.bufnr, entry.lnum)
else
conf.buffer_previewer_maker(p, self.state.bufnr, {
bufname = self.state.bufname,
callback = function(bufnr)
jump_to_line(self, bufnr, entry.lnum)
end,
})
end
end,
}
end, {})
previewers.qflist = previewers.vimgrep
previewers.ctags = defaulter(function(_)
local determine_jump = function(entry)
if entry.scode then
return function(self)
local scode = string.gsub(entry.scode, "[$]$", "")
scode = string.gsub(scode, [[\\]], [[\]])
scode = string.gsub(scode, [[\/]], [[/]])
scode = string.gsub(scode, "[*]", [[\*]])
pcall(vim.fn.matchdelete, self.state.hl_id, self.state.winid)
vim.cmd "norm! gg"
vim.fn.search(scode, "W")
vim.cmd "norm! zz"
self.state.hl_id = vim.fn.matchadd("TelescopePreviewMatch", scode)
end
else
return function(self, bufnr)
if self.state.last_set_bufnr then
pcall(vim.api.nvim_buf_clear_namespace, self.state.last_set_bufnr, ns_previewer, 0, -1)
end
pcall(vim.api.nvim_buf_add_highlight, bufnr, ns_previewer, "TelescopePreviewMatch", entry.lnum - 1, 0, -1)
pcall(vim.api.nvim_win_set_cursor, self.state.winid, { entry.lnum, 0 })
self.state.last_set_bufnr = bufnr
end
end
end
return previewers.new_buffer_previewer {
title = "Tags Preview",
teardown = function(self)
if self.state and self.state.hl_id then
pcall(vim.fn.matchdelete, self.state.hl_id, self.state.hl_win)
self.state.hl_id = nil
elseif self.state and self.state.last_set_bufnr and vim.api.nvim_buf_is_valid(self.state.last_set_bufnr) then
vim.api.nvim_buf_clear_namespace(self.state.last_set_bufnr, ns_previewer, 0, -1)
end
end,
get_buffer_by_name = function(_, entry)
return entry.filename
end,
define_preview = function(self, entry, status)
conf.buffer_previewer_maker(entry.filename, self.state.bufnr, {
bufname = self.state.bufname,
callback = function(bufnr)
vim.api.nvim_buf_call(bufnr, function()
determine_jump(entry)(self, bufnr)
end)
end,
})
end,
}
end, {})
previewers.builtin = defaulter(function(_)
return previewers.new_buffer_previewer {
title = "Grep Preview",
teardown = search_teardown,
get_buffer_by_name = function(_, entry)
return entry.filename
end,
define_preview = function(self, entry, status)
local module_name = vim.fn.fnamemodify(entry.filename, ":t:r")
local text
if entry.text:sub(1, #module_name) ~= module_name then
text = module_name .. "." .. entry.text
else
text = entry.text:gsub("_", ".", 1)
end
conf.buffer_previewer_maker(entry.filename, self.state.bufnr, {
bufname = self.state.bufname,
callback = function(bufnr)
search_cb_jump(self, bufnr, text)
end,
})
end,
}
end, {})
previewers.help = defaulter(function(_)
return previewers.new_buffer_previewer {
title = "Help Preview",
teardown = search_teardown,
get_buffer_by_name = function(_, entry)
return entry.filename
end,
define_preview = function(self, entry, status)
local query = entry.cmd
query = query:sub(2)
query = [[\V]] .. query
conf.buffer_previewer_maker(entry.filename, self.state.bufnr, {
bufname = self.state.bufname,
callback = function(bufnr)
putils.regex_highlighter(bufnr, "help")
search_cb_jump(self, bufnr, query)
end,
})
end,
}
end, {})
previewers.man = defaulter(function(opts)
local pager = utils.get_lazy_default(opts.PAGER, function()
return vim.fn.executable "col" == 1 and "col -bx" or ""
end)
return previewers.new_buffer_previewer {
title = "Man Preview",
get_buffer_by_name = function(_, entry)
return entry.value .. "/" .. entry.section
end,
define_preview = function(self, entry, status)
local win_width = vim.api.nvim_win_get_width(self.state.winid)
putils.job_maker({ "man", entry.section, entry.value }, self.state.bufnr, {
env = { ["PAGER"] = pager, ["MANWIDTH"] = win_width },
value = entry.value .. "/" .. entry.section,
bufname = self.state.bufname,
})
putils.regex_highlighter(self.state.bufnr, "man")
end,
}
end)
previewers.git_branch_log = defaulter(function(opts)
local highlight_buffer = function(bufnr, content)
for i = 1, #content do
local line = content[i]
local _, hstart = line:find "[%*%s|]*"
if hstart then
local hend = hstart + 7
if hend < #line then
vim.api.nvim_buf_add_highlight(bufnr, ns_previewer, "TelescopeResultsIdentifier", i - 1, hstart - 1, hend)
end
end
local _, cstart = line:find "- %("
if cstart then
local cend = string.find(line, "%) ")
if cend then
vim.api.nvim_buf_add_highlight(bufnr, ns_previewer, "TelescopeResultsConstant", i - 1, cstart - 1, cend)
end
end
local dstart, _ = line:find " %(%d"
if dstart then
vim.api.nvim_buf_add_highlight(bufnr, ns_previewer, "TelescopeResultsSpecialComment", i - 1, dstart, #line)
end
end
end
return previewers.new_buffer_previewer {
title = "Git Branch Preview",
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, status)
local cmd = {
"git",
"--no-pager",
"log",
"--graph",
"--pretty=format:%h -%d %s (%cr)",
"--abbrev-commit",
"--date=relative",
entry.value,
}
putils.job_maker(cmd, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
callback = function(bufnr, content)
if not content then
return
end
highlight_buffer(bufnr, content)
end,
})
end,
}
end, {})
previewers.git_stash_diff = defaulter(function(opts)
return previewers.new_buffer_previewer {
title = "Git Stash Preview",
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, _)
putils.job_maker({ "git", "--no-pager", "stash", "show", "-p", entry.value }, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
})
putils.regex_highlighter(self.state.bufnr, "diff")
end,
}
end, {})
previewers.git_commit_diff_to_parent = defaulter(function(opts)
return previewers.new_buffer_previewer {
title = "Git Diff to Parent Preview",
teardown = search_teardown,
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, status)
local cmd = { "git", "--no-pager", "diff", entry.value .. "^!" }
if opts.current_file then
table.insert(cmd, "--")
table.insert(cmd, opts.current_file)
end
putils.job_maker(cmd, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
callback = function(bufnr)
search_cb_jump(self, bufnr, opts.current_line)
end,
})
putils.regex_highlighter(self.state.bufnr, "diff")
end,
}
end, {})
previewers.git_commit_diff_to_head = defaulter(function(opts)
return previewers.new_buffer_previewer {
title = "Git Diff to Head Preview",
teardown = search_teardown,
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, status)
local cmd = { "git", "--no-pager", "diff", "--cached", entry.value }
if opts.current_file then
table.insert(cmd, "--")
table.insert(cmd, opts.current_file)
end
putils.job_maker(cmd, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
callback = function(bufnr)
search_cb_jump(self, bufnr, opts.current_line)
end,
})
putils.regex_highlighter(self.state.bufnr, "diff")
end,
}
end, {})
previewers.git_commit_diff_as_was = defaulter(function(opts)
return previewers.new_buffer_previewer {
title = "Git Show Preview",
teardown = search_teardown,
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, status)
local cmd = { "git", "--no-pager", "show" }
local cf = opts.current_file and Path:new(opts.current_file):make_relative(opts.cwd)
local value = cf and (entry.value .. ":" .. cf) or entry.value
local ft = cf and pfiletype.detect(value) or "diff"
table.insert(cmd, value)
putils.job_maker(cmd, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
callback = function(bufnr)
search_cb_jump(self, bufnr, opts.current_line)
end,
})
putils.highlighter(self.state.bufnr, ft)
end,
}
end, {})
previewers.git_commit_message = defaulter(function(opts)
local hl_map = {
"TelescopeResultsIdentifier",
"TelescopePreviewUser",
"TelescopePreviewDate",
}
return previewers.new_buffer_previewer {
title = "Git Message",
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, status)
local cmd = { "git", "--no-pager", "log", "-n 1", entry.value }
putils.job_maker(cmd, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
callback = function(bufnr, content)
if not content then
return
end
for k, v in ipairs(hl_map) do
local _, s = content[k]:find "%s"
if s then
vim.api.nvim_buf_add_highlight(bufnr, ns_previewer, v, k - 1, s, #content[k])
end
end
end,
})
end,
}
end, {})
previewers.git_file_diff = defaulter(function(opts)
return previewers.new_buffer_previewer {
title = "Git File Diff Preview",
get_buffer_by_name = function(_, entry)
return entry.value
end,
define_preview = function(self, entry, status)
if entry.status and (entry.status == "??" or entry.status == "A ") then
local p = from_entry.path(entry, true)
if p == nil or p == "" then
return
end
conf.buffer_previewer_maker(p, self.state.bufnr, {
bufname = self.state.bufname,
})
else
putils.job_maker({ "git", "--no-pager", "diff", entry.value }, self.state.bufnr, {
value = entry.value,
bufname = self.state.bufname,
cwd = opts.cwd,
})
putils.regex_highlighter(self.state.bufnr, "diff")
end
end,
}
end, {})
previewers.autocommands = defaulter(function(_)
return previewers.new_buffer_previewer {
title = "Autocommands Preview",
teardown = function(self)
if self.state and self.state.last_set_bufnr and vim.api.nvim_buf_is_valid(self.state.last_set_bufnr) then
pcall(vim.api.nvim_buf_clear_namespace, self.state.last_set_bufnr, ns_previewer, 0, -1)
end
end,
get_buffer_by_name = function(_, entry)
return entry.group
end,
define_preview = function(self, entry, status)
local results = vim.tbl_filter(function(x)
return x.group == entry.group
end, status.picker.finder.results)
if self.state.last_set_bufnr then
pcall(vim.api.nvim_buf_clear_namespace, self.state.last_set_bufnr, ns_previewer, 0, -1)
end
local selected_row = 0
if self.state.bufname ~= entry.group then
local display = {}
table.insert(display, string.format(" augroup: %s - [ %d entries ]", entry.group, #results))
-- TODO: calculate banner width/string in setup()
-- TODO: get column characters to be the same HL group as border
table.insert(display, string.rep("─", vim.fn.getwininfo(status.preview_win)[1].width))
for idx, item in ipairs(results) do
if item == entry then
selected_row = idx
end
table.insert(display, string.format(" %-14s▏%-08s %s", item.event, item.ft_pattern, item.command))
end
vim.api.nvim_buf_set_option(self.state.bufnr, "filetype", "vim")
vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, display)
vim.api.nvim_buf_add_highlight(self.state.bufnr, 0, "TelescopeBorder", 1, 0, -1)
else
for idx, item in ipairs(results) do
if item == entry then
selected_row = idx
break
end
end
end
vim.api.nvim_buf_add_highlight(self.state.bufnr, ns_previewer, "TelescopePreviewLine", selected_row + 1, 0, -1)
vim.api.nvim_win_set_cursor(status.preview_win, { selected_row + 1, 0 })
self.state.last_set_bufnr = self.state.bufnr
end,
}
end, {})
previewers.highlights = defaulter(function(_)
return previewers.new_buffer_previewer {
title = "Highlights Preview",
teardown = function(self)
if self.state and self.state.last_set_bufnr and vim.api.nvim_buf_is_valid(self.state.last_set_bufnr) then
vim.api.nvim_buf_clear_namespace(self.state.last_set_bufnr, ns_previewer, 0, -1)
end
end,
get_buffer_by_name = function()
return "highlights"
end,
define_preview = function(self, entry, status)
putils.with_preview_window(status, nil, function()
if not self.state.bufname then
local output = vim.split(vim.fn.execute "highlight", "\n")
local hl_groups = {}
for _, v in ipairs(output) do
if v ~= "" then
if v:sub(1, 1) == " " then
local part_of_old = v:match "%s+(.*)"
hl_groups[table.getn(hl_groups)] = hl_groups[table.getn(hl_groups)] .. part_of_old
else
table.insert(hl_groups, v)
end
end
end
vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, hl_groups)
for k, v in ipairs(hl_groups) do
local startPos = string.find(v, "xxx", 1, true) - 1
local endPos = startPos + 3
local hlgroup = string.match(v, "([^ ]*)%s+.*")
pcall(vim.api.nvim_buf_add_highlight, self.state.bufnr, 0, hlgroup, k - 1, startPos, endPos)
end
end
pcall(vim.api.nvim_buf_clear_namespace, self.state.bufnr, ns_previewer, 0, -1)
vim.cmd "norm! gg"
vim.fn.search(entry.value .. " ")
local lnum = vim.fn.line "."
-- That one is actually a match but its better to use it like that then matchadd
vim.api.nvim_buf_add_highlight(
self.state.bufnr,
ns_previewer,
"TelescopePreviewMatch",
lnum - 1,
0,
#entry.value
)
end)
end,
}
end, {})
previewers.display_content = defaulter(function(_)
return previewers.new_buffer_previewer {
define_preview = function(self, entry, status)
putils.with_preview_window(status, nil, function()
assert(
type(entry.preview_command) == "function",
"entry must provide a preview_command function which will put the content into the buffer"
)
entry.preview_command(entry, self.state.bufnr)
end)
end,
}
end, {})
return previewers