feat: add ip netns support

README.md

@@ -248,12 +248,12 @@ Usage of powerline-go:
          (default "patched")
   -modules string
          The list of modules to load, separated by ','
-         (valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)
+         (valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, netns, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)
          Unrecognized modules will be invoked as 'powerline-go-MODULE' executable plugins and should output a (possibly empty) list of JSON objects that unmarshal to powerline-go's Segment structs.
          (default "venv,user,host,ssh,cwd,perms,git,hg,jobs,exit,root")
   -modules-right string
          The list of modules to load anchored to the right, for shells that support it, separated by ','
-         (valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, wsl)
+         (valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, netns, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, wsl)
          Unrecognized modules will be invoked as 'powerline-go-MODULE' executable plugins and should output a (possibly empty) list of JSON objects that unmarshal to powerline-go's Segment structs.
   -newline
          Show the prompt on a new line
@@ -266,7 +266,7 @@ Usage of powerline-go:
          Use '~' for your home dir. You may need to escape this character to avoid shell substitution.
   -priority string
          Segments sorted by priority, if not enough space exists, the least priorized segments are removed first. Separate with ','
-         (valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)
+         (valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, netns, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)
          (default "root,cwd,user,host,ssh,perms,git-branch,git-status,hg,jobs,exit,cwd-path")
   -shell string
          Set this to your shell type

args.go

@@ -127,19 +127,19 @@ var args = arguments{
 		"modules",
 		strings.Join(defaults.Modules, ","),
 		commentsWithDefaults("The list of modules to load, separated by ','",
-			"(valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)",
+			"(valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, netns, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)",
 			"Unrecognized modules will be invoked as 'powerline-go-MODULE' executable plugins and should output a (possibly empty) list of JSON objects that unmarshal to powerline-go's Segment structs.")),
 	ModulesRight: flag.String(
 		"modules-right",
 		strings.Join(defaults.ModulesRight, ","),
 		comments("The list of modules to load anchored to the right, for shells that support it, separated by ','",
-			"(valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, wsl)",
+			"(valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, netns, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, wsl)",
 			"Unrecognized modules will be invoked as 'powerline-go-MODULE' executable plugins and should output a (possibly empty) list of JSON objects that unmarshal to powerline-go's Segment structs.")),
 	Priority: flag.String(
 		"priority",
 		strings.Join(defaults.Priority, ","),
 		commentsWithDefaults("Segments sorted by priority, if not enough space exists, the least priorized segments are removed first. Separate with ','",
-			"(valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)")),
+			"(valid choices: aws, bzr, cwd, direnv, docker, docker-context, dotenv, duration, exit, fossil, gcp, git, gitlite, goenv, hg, host, jobs, kube, load, netns, newline, nix-shell, node, perlbrew, perms, plenv, rbenv, root, rvm, shell-var, shenv, ssh, svn, termtitle, terraform-workspace, time, user, venv, vgo, vi-mode, wsl)")),
 	MaxWidthPercentage: flag.Int(
 		"max-width",
 		defaults.MaxWidthPercentage,

defaults.go

@@ -545,6 +545,9 @@ var defaults = Config{
 			ViModeCommandBg: 250,
 			ViModeInsertFg:  22,
 			ViModeInsertBg:  70,
+
+			NetnsFg: 208, // approx. netfilter.org logo "fg"
+			NetnsBg: 4,   // approx. netfilter.org logo "bg"
 		},
 		"low-contrast": {
 			Reset: 0xFF,

main.go

@@ -91,6 +91,7 @@ var modules = map[string]func(*powerline) []pwl.Segment{
 	"jobs":                segmentJobs,
 	"kube":                segmentKube,
 	"load":                segmentLoad,
+	"netns":               segmentNetns,
 	"newline":             segmentNewline,
 	"perlbrew":            segmentPerlbrew,
 	"plenv":               segmentPlEnv,

segment-netns.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"os/exec"
+	"strings"
+
+	pwl "github.com/justjanne/powerline-go/powerline"
+)
+
+func segmentNetns(p *powerline) []pwl.Segment {
+	output, err := exec.Command("ip", "netns", "identify").Output()
+	if err != nil || len(output) == 0 {
+		return []pwl.Segment{}
+	}
+	outs := strings.TrimSpace(string(output)) // may consist of just a linefeed
+	if len(outs) == 0 {
+		return []pwl.Segment{}
+	}
+	return []pwl.Segment{{
+		Name:       "netns",
+		Content:    outs,
+		Foreground: p.theme.NetnsFg,
+		Background: p.theme.NetnsBg,
+	}}
+}

themes.go

@@ -163,4 +163,7 @@ type Theme struct {
 	ViModeCommandBg uint8
 	ViModeInsertFg uint8
 	ViModeInsertBg uint8
+
+	NetnsFg uint8
+	NetnsBg uint8
 }