From 7601e01fc136d44396646795374c86eec2c04e42 Mon Sep 17 00:00:00 2001
From: Graham Clark <grclark@gmail.com>
Date: Sat, 2 Jul 2022 17:53:41 -0400
Subject: [PATCH] Add an extra token to each line of stderr from termshark
 processes

For example:

time="2022-07-02T12:46:22-04:00" level=error msg="tshark: Configuration Profile \"test1\" does not exist" cmd=/home/gcla/bin/tshark

This might make it a little easier to understand when a tshark process
fails to run correctly.

I may go further and capture stderr for display in a UI error dialog.
---
 pcap/cmds.go | 2 +-
 utils.go     | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/pcap/cmds.go b/pcap/cmds.go
index c82c33f..f1116f9 100644
--- a/pcap/cmds.go
+++ b/pcap/cmds.go
@@ -46,7 +46,7 @@ func (c *Command) String() string {
 func (c *Command) Start() error {
 	c.Lock()
 	defer c.Unlock()
-	c.Cmd.Stderr = log.StandardLogger().Writer()
+	c.Cmd.Stderr = termshark.ErrLogger("cmd", c.Path)
 	c.PutInNewGroupOnUnix()
 	res := c.Cmd.Start()
 	return res
diff --git a/utils.go b/utils.go
index f07ffe0..58bbe37 100644
--- a/utils.go
+++ b/utils.go
@@ -674,6 +674,13 @@ func SaveOffsetToConfig(name string, offsets2 []resizable.Offset) {
 
 //======================================================================
 
+func ErrLogger(key string, val string) *io.PipeWriter {
+	l := log.StandardLogger()
+	return log.NewEntry(l).WithField(key, val).WriterLevel(log.ErrorLevel)
+}
+
+//======================================================================
+
 // Need to publish fields for template use
 type JumpPos struct {
 	Summary string `json:"summary"`