feat(utils): first impl of own commands runner

lua/gopher/_utils/runner.lua

@@ -0,0 +1,54 @@
+local runner = {}
+
+local uv = vim.loop
+
+---@class ProcessOpts
+---@field args? string[]
+---@field cwd? string
+---@field on_exit? fun(ok:boolean, output:string)
+
+---@param opts? ProcessOpts
+---@param cmd string
+function runner.spawn(cmd, opts)
+  opts = opts or {}
+
+  local stdout = assert(uv.new_pipe())
+  local stderr = assert(uv.new_pipe())
+
+  local output = ""
+  ---@type uv_process_t?
+  local handle = nil
+
+  handle = uv.spawn(cmd, {
+    stdio = { nil, stdout, stderr },
+    args = opts.args,
+    cwd = opts.cwd,
+  }, function(status)
+    if handle then
+      handle:close()
+    end
+    stderr:close()
+    stdout:close()
+
+    if opts.on_exit then
+      output = output:gsub("[^\r\n]+\r", "")
+      vim.schedule(function()
+        opts.on_exit(status == 0, output)
+      end)
+    end
+  end)
+
+  local function on_output(err, data)
+    assert(not err, err)
+    if data then
+      output = output .. data:gsub("\r\n", "\n")
+    end
+  end
+
+  uv.read_start(stdout, on_output)
+  uv.read_start(stderr, on_output)
+
+  return handle
+end
+
+return runner