fix!(api.command): stop collect if flow was completed

collect now accepts the flow

lua/microscope/api/command.lua

@@ -118,11 +118,14 @@ function command:into(flow)
   self:close(true)
 end
 
-function command:collect()
+function command:collect(flow)
   local outputs = ""
   for shell_out in self:get_iter() do
+    if flow.stopped() then
+      self:close()
+    end
     outputs = outputs .. shell_out
-    coroutine.yield("")
+    flow.write("")
   end
   self:close(true)
 

readme.md

@@ -544,7 +544,7 @@ To consume the command, you can run:
   ```lua
   local my_echo_result = cmd
     .shell("echo", { "-n", "hello\nworld" }, cwd)
-    :collect()
+    :collect(flow)
   ```
 
 - `into`: push results into the flow.