feat: ibhagwan/fzf-lua support (#150)

* feat: `ibhagwan/fzf-lua` support

* feat(picker): close buffer

* fix: telescope lang picker

* feat: adjust picker sizes

* docs: `picker.provider` config

* feat: picker provider resolver

Author: kawre

Diff for: README.md

@@ -26,7 +26,9 @@ https://github.com/kawre/leetcode.nvim/assets/69250723/aee6584c-e099-4409-b114-1
 
 - [Neovim] >= 0.9.0
 
-- [telescope.nvim]
+- [telescope.nvim] or [fzf-lua]
+
+- [plenary.nvim]
 
 - [nui.nvim]
 
@@ -43,15 +45,12 @@ https://github.com/kawre/leetcode.nvim/assets/69250723/aee6584c-e099-4409-b114-1
 ```lua
 {
     "kawre/leetcode.nvim",
-    build = ":TSUpdate html",
+    build = ":TSUpdate html", -- if you have `nvim-treesitter` installed
     dependencies = {
         "nvim-telescope/telescope.nvim",
-        "nvim-lua/plenary.nvim", -- required by telescope
+        -- "ibhagwan/fzf-lua",
+        "nvim-lua/plenary.nvim",
         "MunifTanjim/nui.nvim",
-
-        -- optional
-        "nvim-treesitter/nvim-treesitter",
-        "nvim-tree/nvim-web-devicons",
     },
     opts = {
         -- configuration goes here
@@ -128,6 +127,9 @@ To see full configuration types see [template.lua](./lua/leetcode/config/templat
         show_stats = true, ---@type boolean
     },
 
+    ---@type lc.picker
+    picker = { provider = nil },
+
     hooks = {
         ---@type fun()[]
         ["enter"] = {},
@@ -275,6 +277,17 @@ injector = { ---@type table<lc.lang, lc.inject>
 }
 ```
 
+### picker
+
+Supported picker providers are `telescope` and `fzf-lua`.
+When provider is `nil`, [leetcode.nvim] will first try to use `fzf-lua`,
+if not found it will fallback to `telescope`.
+
+```lua
+---@type lc.picker
+picker = { provider = nil },
+```
+
 ### hooks
 
 List of functions that get executed on specified event
@@ -493,4 +506,6 @@ You can then exit [leetcode.nvim] using `:Leet exit` command
 [nvim-treesitter]: https://github.com/nvim-treesitter/nvim-treesitter
 [nvim-web-devicons]: https://github.com/nvim-tree/nvim-web-devicons
 [telescope.nvim]: https://github.com/nvim-telescope/telescope.nvim
+[fzf-lua]: https://github.com/ibhagwan/fzf-lua
 [tree-sitter-html]: https://github.com/tree-sitter/tree-sitter-html
+[plenary.nvim]: https://github.com/nvim-lua/plenary.nvim

Diff for: lua/leetcode-ui/question.lua

@@ -228,8 +228,9 @@ function Question:mount()
         local msg = ("Snippet for `%s` not found. Select a different language"):format(self.lang)
         log.warn(msg)
 
-        require("leetcode.pickers.language").pick_lang(self, function(snippet)
-            self.lang = snippet.t.slug
+        local picker = require("leetcode.picker")
+        picker.language(self, function(slug)
+            self.lang = slug
             self:handle_mount()
         end)
     end

Diff for: lua/leetcode/command/init.lua

@@ -26,7 +26,8 @@ function cmd.problems(options)
     require("leetcode.utils").auth_guard()
 
     local p = require("leetcode.cache.problemlist").get()
-    require("leetcode.pickers.question").pick(p, options)
+    local picker = require("leetcode.picker")
+    picker.question(p, options)
 end
 
 ---@param cb? function
@@ -219,14 +220,16 @@ function cmd.start_user_session() --
 end
 
 function cmd.question_tabs()
-    require("leetcode.pickers.question-tabs").pick()
+    local picker = require("leetcode.picker")
+    picker.tabs()
 end
 
 function cmd.change_lang()
     local utils = require("leetcode.utils")
     local q = utils.curr_question()
     if q then
-        require("leetcode.pickers.language").pick(q)
+        local picker = require("leetcode.picker")
+        picker.language(q)
     end
 end
 

Diff for: lua/leetcode/config/template.lua

@@ -38,6 +38,8 @@
 
 ---@alias lc.storage table<"cache"|"home", string>
 
+---@alias lc.picker { provider?: "fzf-lua" | "telescope" }
+
 ---@class lc.UserConfig
 local M = {
     ---@type string
@@ -101,6 +103,9 @@ local M = {
         show_stats = true, ---@type boolean
     },
 
+    ---@type lc.picker
+    picker = { provider = nil },
+
     hooks = {
         ---@type fun()[]
         ["enter"] = {},

Diff for: lua/leetcode/picker/init.lua

@@ -0,0 +1,93 @@
+local log = require("leetcode.logger")
+local config = require("leetcode.config")
+
+---@return "fzf" | "telescope"
+local function resolve_provider()
+    ---@type string
+    local provider = config.user.picker.provider
+
+    if provider == nil then
+        local fzf_ok = pcall(require, "fzf-lua")
+        if fzf_ok then
+            return "fzf"
+        end
+        local telescope_ok = pcall(require, "telescope")
+        if telescope_ok then
+            return "telescope"
+        end
+        error("no supported picker provider found")
+    else
+        local provider_ok = pcall(require, provider)
+        assert(provider_ok, ("specified picker provider not found: `%s`"):format(provider))
+        return provider == "fzf-lua" and "fzf" or provider
+    end
+end
+
+---@class leet.Picker
+local P = {}
+P.provider = resolve_provider()
+
+function P.hl_to_ansi(hl_group)
+    local color = vim.api.nvim_get_hl(0, { name = hl_group })
+    if color and color.fg then
+        return string.format(
+            "\x1b[38;2;%d;%d;%dm",
+            bit.rshift(color.fg, 16),
+            bit.band(bit.rshift(color.fg, 8), 0xFF),
+            bit.band(color.fg, 0xFF)
+        )
+    end
+    return ""
+end
+
+function P.apply_hl(text, hl_group)
+    if not hl_group then
+        return text
+    end
+    return P.hl_to_ansi(hl_group) .. text .. "\x1b[0m"
+end
+
+function P.normalize(items)
+    return vim.tbl_map(function(item)
+        return table.concat(
+            vim.tbl_map(function(col)
+                if type(col) == "table" then
+                    return P.apply_hl(col[1], col[2])
+                else
+                    return col
+                end
+            end, item.entry),
+            " "
+        )
+    end, items)
+end
+
+function P.pick(path, ...)
+    local rpath = table.concat({ "leetcode.picker", path, P.provider }, ".")
+    return require(rpath)(...)
+end
+
+function P.language(...)
+    P.pick("language", ...)
+end
+
+function P.question(...)
+    P.pick("question", ...)
+end
+
+function P.tabs()
+    local utils = require("leetcode.utils")
+    local tabs = utils.question_tabs()
+
+    if vim.tbl_isempty(tabs) then
+        return log.warn("No questions opened")
+    end
+
+    P.pick("tabs", tabs)
+end
+
+function P.hidden_field(text, deli)
+    return text:match(("([^%s]+)$"):format(deli))
+end
+
+return P

Diff for: lua/leetcode/picker/language/fzf.lua

@@ -0,0 +1,35 @@
+local fzf = require("fzf-lua")
+local t = require("leetcode.translator")
+local language_picker = require("leetcode.picker.language")
+local Picker = require("leetcode.picker")
+
+local deli = "\t"
+
+return function(question, cb)
+    local items = language_picker.items(question.q.code_snippets)
+
+    for i, item in ipairs(items) do
+        local md = vim.inspect({ slug = item.value.t.slug, lang = item.value.t.lang })
+            :gsub("\n", "")
+        items[i] = table.concat({ Picker.normalize({ item })[1], md }, deli)
+    end
+
+    fzf.fzf_exec(items, {
+        prompt = t("Available Languages") .. "> ",
+        winopts = {
+            win_height = language_picker.height,
+            win_width = language_picker.width,
+        },
+        fzf_opts = {
+            ["--delimiter"] = deli,
+            ["--nth"] = "1",
+            ["--with-nth"] = "1",
+        },
+        actions = {
+            ["default"] = function(selected)
+                local md = Picker.hidden_field(selected[1], deli)
+                language_picker.select(load("return " .. md)(), question, cb)
+            end,
+        },
+    })
+end

Diff for: lua/leetcode/picker/language/init.lua

@@ -0,0 +1,64 @@
+local log = require("leetcode.logger")
+local t = require("leetcode.translator")
+local config = require("leetcode.config")
+local utils = require("leetcode.utils")
+
+local L = {}
+
+L.width = 80
+L.height = 15
+
+---@param snippet lc.QuestionCodeSnippet
+local function dislay_icon(snippet)
+    local hl = "leetcode_lang_" .. snippet.t.slug
+    vim.api.nvim_set_hl(0, hl, { fg = snippet.t.color })
+
+    return { snippet.t.icon, hl }
+end
+
+---@param snippet lc.QuestionCodeSnippet
+local function display_lang(snippet)
+    return { snippet.lang }
+end
+
+function L.entry(item)
+    return {
+        dislay_icon(item),
+        display_lang(item),
+    }
+end
+
+---@param item lc.QuestionCodeSnippet
+function L.ordinal(item)
+    return ("%s %s"):format(item.t.lang, item.t.slug)
+end
+
+function L.items(content)
+    return vim.tbl_map(function(item)
+        ---@type lc.language
+        item.t = utils.get_lang(item.lang_slug)
+        if not item.t then
+            return
+        end
+        return { entry = L.entry(item), value = item }
+    end, content)
+end
+
+function L.select(selection, question, cb, close)
+    if question.lang == selection.slug then
+        return log.warn(("%s: %s"):format(t("Language already set to"), selection.lang))
+    end
+
+    config.lang = selection.slug
+    if close then
+        close()
+    end
+
+    if cb then
+        cb(selection.slug)
+    else
+        question:change_lang(selection.slug)
+    end
+end
+
+return L

Diff for: lua/leetcode/picker/language/telescope.lua

@@ -0,0 +1,67 @@
+local log = require("leetcode.logger")
+local t = require("leetcode.translator")
+
+local pickers = require("telescope.pickers")
+local finders = require("telescope.finders")
+local conf = require("telescope.config").values
+local config = require("leetcode.config")
+
+local entry_display = require("telescope.pickers.entry_display")
+local actions = require("telescope.actions")
+local action_state = require("telescope.actions.state")
+local language_picker = require("leetcode.picker.language")
+
+local displayer = entry_display.create({
+    separator = " ",
+    items = {
+        { width = 1 },
+        { remaining = true },
+    },
+})
+
+local function entry_maker(item)
+    return {
+        value = item.value,
+        display = function()
+            return displayer(item.entry)
+        end,
+        ordinal = language_picker.ordinal(item.value),
+    }
+end
+
+local opts = require("telescope.themes").get_dropdown({
+    layout_config = {
+        width = language_picker.width,
+        height = language_picker.height,
+    },
+})
+
+---@param question lc.ui.Question
+return function(question, cb)
+    local items = language_picker.items(question.q.code_snippets)
+
+    pickers
+        .new(opts, {
+            prompt_title = t("Available Languages"),
+            finder = finders.new_table({
+                results = items,
+                entry_maker = entry_maker,
+            }),
+            sorter = conf.generic_sorter(opts),
+            attach_mappings = function(prompt_bufnr)
+                actions.select_default:replace(function()
+                    local selection = action_state.get_selected_entry()
+                    if not selection then
+                        log.warn("No selection")
+                        return
+                    end
+                    language_picker.select(selection.value.t, question, cb, function()
+                        actions.close(prompt_bufnr)
+                    end)
+                end)
+
+                return true
+            end,
+        })
+        :find()
+end