feat(picker.proc): finder to process json

lua/snacks/picker/source/proc.lua

@@ -14,16 +14,24 @@ M.USE_QUEUE = true
 ---@field cwd? string
 ---@field notify? boolean Notify on failure
 ---@field transform? snacks.picker.transform
+---@field raw? boolean Return raw output without processing
 
 ---@param opts snacks.picker.proc.Config|{[1]: snacks.picker.Config, [2]: snacks.picker.proc.Config}
----@type snacks.picker.finder
+local function get_opts(opts)
-function M.proc(opts, ctx)
   if svim.islist(opts) then
     local transform = opts[2].transform
     opts = Snacks.config.merge(unpack(vim.deepcopy(opts))) --[[@as snacks.picker.proc.Config]]
     opts.transform = transform
   end
   ---@cast opts snacks.picker.proc.Config
+  return opts
+end
+
+---@param opts snacks.picker.proc.Config|{[1]: snacks.picker.Config, [2]: snacks.picker.proc.Config}
+---@type snacks.picker.finder
+function M.proc(opts, ctx)
+  opts = get_opts(opts)
+  ---@cast opts snacks.picker.proc.Config
   assert(opts.cmd, "`opts.cmd` is required")
   ---@async
   return function(cb)
@@ -102,6 +110,9 @@ function M.proc(opts, ctx)
       if not data then
         return prev and cb({ text = prev })
       end
+      if opts.raw then
+        return cb({ text = data })
+      end
       local from = 1
       while from <= #data do
         local nl = data:find(sep, from, true)
@@ -152,6 +163,34 @@ function M.proc(opts, ctx)
   end
 end
 
+---@param opts snacks.picker.proc.Config|{[1]: snacks.picker.Config, [2]: snacks.picker.proc.Config}
+---@type snacks.picker.finder
+function M.json(opts, ctx)
+  opts = get_opts(opts) --[[@as snacks.picker.proc.Config]]
+  opts.raw = true
+  local transform = opts.transform
+  opts.transform = nil
+  return function(cb)
+    local Buffer = require("string.buffer")
+    local data = Buffer.new()
+    M.proc(opts, ctx)(function(item)
+      data:put(item.text)
+    end)
+    local json = vim.json.decode(data:get())
+    assert(svim.islist(json), "Expected JSON array")
+    ---@cast json snacks.picker.finder.Item[]
+    for _, item in ipairs(json) do
+      item = setmetatable({ item = item }, { __index = item })
+      item.text = item.text or ""
+      local t = transform and transform(item, ctx) or nil
+      item = type(t) == "table" and t or item
+      if t ~= false then
+        cb(item)
+      end
+    end
+  end
+end
+
 ---@param opts {cmd: string, args?: string[], cwd?: string}
 function M.debug(opts)
   vim.schedule(function()