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Add live-preview to Neovim plugin #27

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Merged
alerque merged 3 commits into from
Dec 19, 2025
Merged

Add live-preview to Neovim plugin #27

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237116a
feat(nvim): Preview changes before accepting
alerque Sep 16, 2024
cb20ad5
Merge branch 'master' into preview
alerque Dec 19, 2025
d1d2ed9
chore(nvim): Finish and cleanup live preview after merge
alerque Dec 19, 2025
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95 changes: 60 additions & 35 deletions plugin/decasify.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -13,10 +13,10 @@ end

local decasify = require("decasify")

local function replace_visual_selection (callback)
local function replace_visual_selection (buffer, callback)
local lpos = vim.fn.getpos("'<")
local rpos = vim.fn.getpos("'>")
local lines = vim.api.nvim_buf_get_lines(0, lpos[2] - 1, rpos[2], true)
local lines = vim.api.nvim_buf_get_lines(buffer, lpos[2] - 1, rpos[2], true)
for i, line in ipairs(lines) do
if #lines == 1 then
local recased = callback(line:sub(lpos[3], rpos[3]))
Expand All @@ -31,61 +31,86 @@ local function replace_visual_selection (callback)
lines[i] = callback(line)
end
end
vim.api.nvim_buf_set_lines(0, lpos[2] - 1, rpos[2], true, lines)
vim.api.nvim_buf_set_lines(buffer, lpos[2] - 1, rpos[2], true, lines)
end

local function replace_line_range (args, callback)
local function replace_line_range (buffer, args, callback)
local first, last = args.line1, args.line2
local lines = vim.api.nvim_buf_get_lines(0, first - 1, last, true)
local lines = vim.api.nvim_buf_get_lines(buffer, first - 1, last, true)
for i, line in ipairs(lines) do
lines[i] = callback(line)
end
vim.api.nvim_buf_set_lines(0, first - 1, last, true, lines)
vim.api.nvim_buf_set_lines(buffer, first - 1, last, true, lines)
end

vim.api.nvim_create_user_command("Decasify", function (args)
local function replace_preview_buffer (buffer, args, preview_buf, callback)
local first, last = args.line1, args.line2
local src_lines = vim.api.nvim_buf_get_lines(buffer, first - 1, last, false)
local preview_lines = {}
for _, line in ipairs(src_lines) do
table.insert(preview_lines, callback(line))
end
vim.api.nvim_buf_set_lines(preview_buf, 0, -1, false, preview_lines)
end

local function nvim_decasify (args, _, preview_buf)
local case = args.fargs[1] or vim.b.decasify_case or vim.g.decasify_case or nil
local locale = args.fargs[2] or vim.b.decasify_locale or vim.g.decasify_locale or nil
local style = args.fargs[3] or vim.b.decasify_style or vim.g.decasify_style or nil
local overrides = vim.b.decasify_overrides or vim.g.decasify_overrides or {}
local opts = {
overrides = args.fargs[4] and vim.split(args.fargs[4], ",") or overrides,
}
local decase = function (input)
local function decase (input)
return decasify.case(input, case, locale, style, opts)
end
-- https://www.petergundel.de/neovim/lua/hack/2023/12/17/get-neovim-mode-when-executing-a-command.html
local smark = vim.api.nvim_buf_get_mark(0, "<")[2]
local emark = vim.api.nvim_buf_get_mark(0, ">")[2]
if args.count == -1 or smark > 1000000 or emark > 1000000 then
replace_line_range(args, decase)
local buffer = args.buf or vim.api.nvim_get_current_buf()
if not preview_buf then
-- https://www.petergundel.de/neovim/lua/hack/2023/12/17/get-neovim-mode-when-executing-a-command.html
local smark = vim.api.nvim_buf_get_mark(buffer, "<")[2]
local emark = vim.api.nvim_buf_get_mark(buffer, ">")[2]
if args.count == -1 or smark > 1000000 or emark > 1000000 then
replace_line_range(buffer, args, decase)
else
replace_visual_selection(buffer, decase)
end
else
replace_preview_buffer(buffer, args, preview_buf, decase)
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end
end

local function nvim_decasify_preview (args, _, preview_buf)
nvim_decasify(args, _, preview_buf)
return 1
end

local function nvim_decasify_complete (arg_lead, cmd_line, _)
local parts = vim.split(cmd_line, "%s+", { trimempty = true })
table.remove(parts, 1)
local trailing_space = cmd_line:sub(-1):match("%s") ~= nil
local arg_index = #parts + (trailing_space and 1 or 0)
local function filter (list)
return vim.tbl_filter(function (item)
return item:find("^" .. arg_lead)
end, list)
end
if arg_index == 1 then
return filter({ "lower", "sentence", "title", "upper" })
elseif arg_index == 2 then
return filter({ "en", "es", "tr" })
elseif arg_index == 3 then
return filter({ "ap", "cmos", "default", "fundeu", "grubber", "rae", "tdk" })
else
replace_visual_selection(decase)
return {}
end
end, {
end

vim.api.nvim_create_user_command("Decasify", nvim_decasify, {
desc = "Pass lines to decasify for recasing prose",
nargs = "*",
range = true,
complete = function (arg_lead, cmd_line, _)
local parts = vim.split(cmd_line, "%s+", { trimempty = true })
table.remove(parts, 1)
local trailing_space = cmd_line:sub(-1):match("%s") ~= nil
local arg_index = #parts + (trailing_space and 1 or 0)
local function filter (list)
return vim.tbl_filter(function (item)
return item:find("^" .. arg_lead)
end, list)
end
if arg_index == 1 then
return filter({ "lower", "sentence", "title", "upper" })
elseif arg_index == 2 then
return filter({ "en", "es", "tr" })
elseif arg_index == 3 then
return filter({ "ap", "cmos", "default", "fundeu", "grubber", "rae", "tdk" })
else
return {}
end
end,
preview = nvim_decasify_preview,
complete = nvim_decasify_complete,
})

vim.g.loaded_decasify = true
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