Handle stderr callback

This can help with debugging.

Author: vimpostor

autoload/tpipeline.vim

@@ -142,6 +142,19 @@ func tpipeline#initialize()
 	augroup END
 endfunc
 
+func tpipeline#on_stderr(chan_id, data, name)
+	let s:elines[-1] .= a:data[0]
+	call extend(s:elines, a:data[1:])
+	while len(s:elines) > 1
+		let line = remove(s:elines, 0)
+		call tpipeline#debug#log_err(line)
+	endwhile
+endfunc
+
+func tpipeline#err_cb(channel, msg)
+	call tpipeline#debug#log_err(a:msg)
+endfunc
+
 func tpipeline#on_exit(job, code, t)
 	call tpipeline#state#freeze()
 	let s:exit_code = a:code
@@ -183,11 +196,12 @@ func tpipeline#fork_job()
 
 	let command = ['bash', '-c', script]
 	if s:is_nvim
-		let options = #{on_exit: function('tpipeline#on_exit')}
+		let s:elines = ['']
+		let options = #{on_stderr: function('tpipeline#on_stderr'), on_exit: function('tpipeline#on_exit')}
 		let s:job = jobstart(command, options)
 		let s:channel = s:job
 	else
-		let options = #{noblock: 1, exit_cb: function('tpipeline#exit_cb')}
+		let options = #{noblock: 1, err_cb: function('tpipeline#err_cb'), exit_cb: function('tpipeline#exit_cb')}
 		let s:job = job_start(command, options)
 		let s:channel = job_getchannel(s:job)
 	endif

autoload/tpipeline/debug.vim

@@ -1,4 +1,5 @@
 func tpipeline#debug#init()
+	let s:stderr = []
 	let s:tpipeline_filepath = tpipeline#get_filepath()
 	let s:tpipeline_right_filepath = s:tpipeline_filepath . '-R'
 endfunc
@@ -20,7 +21,7 @@ func tpipeline#debug#info()
 	let tmux = systemlist("tmux -V")[-1]
 	let jobstate = tpipeline#job_state()
 	let os = tpipeline#debug#os()
-	let result = #{left: left, right: right, tmux: tmux, plugin_version: tpipeline#version#string(), job_state: jobstate, os: os}
+	let result = #{left: left, right: right, tmux: tmux, plugin_version: tpipeline#version#string(), job_state: jobstate, job_errors: s:stderr, os: os}
 
 	if has('nvim')
 		let stl = g:tpipeline_statusline
@@ -45,4 +46,8 @@ func tpipeline#debug#info()
 	return result
 endfunc
 
+func tpipeline#debug#log_err(line)
+	call add(s:stderr, a:line)
+endfunc
+
 call tpipeline#debug#init()

lua/tpipeline/health.lua

@@ -16,6 +16,12 @@ M.check = function()
 	else
 		vim.health.report_error(string.format("Background job is not running: %s", info.job_state))
 	end
+
+	if next(info.job_errors) == nil then
+		vim.health.report_ok("No job errors reported")
+	else
+		vim.health.report_warn("Job reported errors", info.job_errors)
+	end
 end
 
 return M

tests/test_general.vim

@@ -34,6 +34,8 @@ func Test_job_runs()
 	let job = tpipeline#debug#info()
 	" background job is still running
 	call assert_match("^run", job.job_state)
+	" no errors
+	call assert_true(job.job_errors->empty(), job.job_errors)
 endfunc
 
 func Strip_hl(s)