From 56991d936b498aa5c925d9c5168dea833a111730 Mon Sep 17 00:00:00 2001
From: "g.lenda" <rminnich@me.com>
Date: Fri, 27 Jun 2025 16:26:41 +0000
Subject: [PATCH 1/3] initial plan9 support

---
 signals_plan9.go | 12 ++++++++++++
 tty_plan9.go     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 signals_plan9.go
 create mode 100644 tty_plan9.go

diff --git a/signals_plan9.go b/signals_plan9.go
new file mode 100644
index 0000000000..5919eb0444
--- /dev/null
+++ b/signals_plan9.go
@@ -0,0 +1,12 @@
+package tea
+
+import "time"
+
+// listenForResize sends messages (or errors) when the terminal resizes.
+// Argument output should be the file descriptor for the terminal; usually
+// os.Stdout.
+func (p *Program) listenForResize(done chan struct{}) {
+	for {
+		time.Sleep(100 * time.Second)
+	}
+}
diff --git a/tty_plan9.go b/tty_plan9.go
new file mode 100644
index 0000000000..3e05f97ae5
--- /dev/null
+++ b/tty_plan9.go
@@ -0,0 +1,45 @@
+package tea
+
+import (
+	"fmt"
+	"os"
+)
+
+func (p *Program) initInput() (err error) {
+	/*
+		// Check if input is a terminal
+		if f, ok := p.input.(term.File); ok && term.IsTerminal(f.Fd()) {
+			p.ttyInput = f
+			p.previousTtyInputState, err = term.MakeRaw(p.ttyInput.Fd())
+			if err != nil {
+				return fmt.Errorf("error entering raw mode: %w", err)
+			}
+		}
+
+		if f, ok := p.output.(term.File); ok && term.IsTerminal(f.Fd()) {
+			p.ttyOutput = f
+		}
+	*/
+	return fmt.Errorf("no yet")
+}
+
+func openInputTTY() (*os.File, error) {
+	f, err := os.Open("/dev/cons")
+	if err != nil {
+		return nil, fmt.Errorf("could not open a new TTY: %w", err)
+	}
+	return f, nil
+}
+
+const suspendSupported = false
+
+// Send SIGTSTP to the entire process group.
+func suspendProcess() {
+	/*
+	   c := make(chan os.Signal, 1)
+	   signal.Notify(c, syscall.SIGCONT)
+	   _ = syscall.Kill(0, syscall.SIGTSTP)
+	   // blocks until a CONT happens...
+	   <-c
+	*/
+}

From 255445613b2e1578c75fd54df9a0b28606cf9c01 Mon Sep 17 00:00:00 2001
From: "g.lenda" <rminnich@me.com>
Date: Mon, 30 Jun 2025 18:39:36 +0000
Subject: [PATCH 2/3] Finish plan 9 support. Depends on a pending commit to
 x/term. If that commit is pushed, then this go test works.

---
 tty_plan9.go | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/tty_plan9.go b/tty_plan9.go
index 3e05f97ae5..229df3f2fd 100644
--- a/tty_plan9.go
+++ b/tty_plan9.go
@@ -2,25 +2,28 @@ package tea
 
 import (
 	"fmt"
+	"log"
 	"os"
+	"path/filepath"
+
+	"github.com/charmbracelet/x/term"
 )
 
 func (p *Program) initInput() (err error) {
-	/*
-		// Check if input is a terminal
-		if f, ok := p.input.(term.File); ok && term.IsTerminal(f.Fd()) {
-			p.ttyInput = f
-			p.previousTtyInputState, err = term.MakeRaw(p.ttyInput.Fd())
-			if err != nil {
-				return fmt.Errorf("error entering raw mode: %w", err)
-			}
+	// Check if input is a terminal
+	if f, ok := p.input.(term.File); ok && term.IsTerminal(f.Fd()) {
+		p.ttyInput = f
+		p.previousTtyInputState, err = term.MakeRaw(p.ttyInput.Fd())
+		if err != nil {
+			return fmt.Errorf("error entering raw mode: %w", err)
 		}
+	}
 
-		if f, ok := p.output.(term.File); ok && term.IsTerminal(f.Fd()) {
-			p.ttyOutput = f
-		}
-	*/
-	return fmt.Errorf("no yet")
+	if f, ok := p.output.(term.File); ok && term.IsTerminal(f.Fd()) {
+		p.ttyOutput = f
+	}
+
+	return nil
 }
 
 func openInputTTY() (*os.File, error) {
@@ -35,11 +38,9 @@ const suspendSupported = false
 
 // Send SIGTSTP to the entire process group.
 func suspendProcess() {
-	/*
-	   c := make(chan os.Signal, 1)
-	   signal.Notify(c, syscall.SIGCONT)
-	   _ = syscall.Kill(0, syscall.SIGTSTP)
-	   // blocks until a CONT happens...
-	   <-c
-	*/
+	p := os.Getpid()
+	ctl := filepath.Join("proc", fmt.Sprintf("%d", p), "ctl")
+	if err := os.WriteFile(ctl, []byte("stop"), 0); err != nil {
+		log.Printf("Write sto to %q: %v", ctl, err)
+	}
 }

From 2a61bccec671c52392b53152d685d6a70fc03bff Mon Sep 17 00:00:00 2001
From: Andrey Nering <andreynering@users.noreply.github.com>
Date: Tue, 1 Jul 2025 17:00:10 -0300
Subject: [PATCH 3/3] ci: build for plan9

---
 .github/workflows/build.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 189c3915df..b634034864 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,3 +17,6 @@ jobs:
       go-version: ""
       go-version-file: ./examples/go.mod
       working-directory: ./examples
+
+  build-plan9:
+    uses: charmbracelet/meta/.github/workflows/build-plan9.yml@main