D1837.id4641.diff
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	diff --git a/cmd/whatcontainer/whatcontainer.go b/cmd/whatcontainer/whatcontainer.go
	--- a/cmd/whatcontainer/whatcontainer.go
	+++ b/cmd/whatcontainer/whatcontainer.go
	@@ -3,6 +3,7 @@
	import (
	"bufio"
	"context"
	+ "devcentral.nasqueron.org/source/docker-processes/internal/stringutilities"
	"devcentral.nasqueron.org/source/docker-processes/pkg/dockerutils"
	"devcentral.nasqueron.org/source/docker-processes/pkg/process"
	"flag"
	@@ -18,6 +19,8 @@
	const DockerApiVersion = "1.37"

	type Config struct {
	+ Prepend bool
	+ Width int
	WithPosition bool
	Position int
	}
	@@ -37,6 +40,8 @@
	config := Config{}

	positionPtr := flag.Int("p", -1, "the position of the field with the PID")
	+ widthPtr := flag.Int ("w", 20, "the amount of characters to use for container name")
	+ appendPtr := flag.Bool("append", false, "append the container name to the line (default behavior is to prepend)")

	flag.Parse()

	@@ -45,10 +50,19 @@
	config.WithPosition = true
	}

	+ config.Prepend = !*appendPtr
	+ config.Width = *widthPtr
	+
	return config
	}

	func addContainerName (line string, processesMap map[int64]string, config Config) string {
	+ containerName := determineContainerName(line, processesMap, config)
	+
	+ return formatLine(line, containerName, config)
	+}
	+
	+func determineContainerName (line string, processesMap map[int64]string, config Config) string {
	fields := strings.Fields(line)

	for i, field := range fields {
	@@ -63,11 +77,24 @@
	}

	if containerName, ok := processesMap[pidCandidate]; ok {
	- return fmt.Sprintf("%s %s", line, containerName)
	+ return containerName
	}
	}

	- return line
	+ return ""
	+}
	+
	+func formatLine(line string, containerName string, config Config) string {
	+ if config.Prepend {
	+ name := stringutilities.PadField(containerName, config.Width)
	+ return fmt.Sprintf("%s %s", name, line)
	+ }
	+
	+ if containerName == "" {
	+ return line
	+ }
	+
	+ return fmt.Sprintf("%s %s", line, containerName)
	}

	func isValidFieldPosition(position int, config Config) bool {
	diff --git a/internal/consoleutilities/consoleutilities.go b/internal/consoleutilities/consoleutilities.go
	new file mode 100644
	--- /dev/null
	+++ b/internal/consoleutilities/consoleutilities.go
	@@ -0,0 +1,12 @@
	+package consoleutilities
	+
	+import (
	+ "os"
	+ "strings"
	+)
	+
	+func IsUTF8() bool {
	+ return strings.Contains(os.Getenv("LC_ALL"), "UTF-8") \|\|
	+ strings.Contains(os.Getenv("LANG"), "UTF-8") \|\|
	+ strings.Contains(os.Getenv("LC_CTYPE"), "UTF-8")
	+}
	diff --git a/internal/stringutilities/stringutilities.go b/internal/stringutilities/stringutilities.go
	--- a/internal/stringutilities/stringutilities.go
	+++ b/internal/stringutilities/stringutilities.go
	@@ -1,5 +1,10 @@
	package stringutilities

	+import (
	+ "devcentral.nasqueron.org/source/docker-processes/internal/consoleutilities"
	+ "strings"
	+)
	+
	func Contains(haystack []string, needle string) bool {
	for _, item := range haystack {
	if item == needle {
	@@ -25,3 +30,20 @@
	return longestWord
	}

	+func PadField(text string, length int) string {
	+ textLen := len(text)
	+
	+ if textLen < length {
	+ return strings.Repeat(" ", length - textLen) + text
	+ }
	+
	+ if textLen > length {
	+ if consoleutilities.IsUTF8() {
	+ return text[:length-1] + "…"
	+ }
	+
	+ return text[:length-1] + "+"
	+ }
	+
	+ return text
	+}

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