From 407bc9d2852d0b8b42d86930eeb968592dfb845c Mon Sep 17 00:00:00 2001
From: Levi Neely <lneely@pascom.net>
Date: Mon, 8 Jun 2026 18:05:32 +0200
Subject: [PATCH] dia

---
 dia/README.md       |  11 +++++
 dia/cmd/Uml/main.go | 100 ++++++++++++++++++++++++++++++++++++++++++++
 dia/go.mod          |   5 +++
 dia/go.sum          |  34 +++++++++++++++
 dia/mkfile          |   5 +++
 5 files changed, 155 insertions(+)
 create mode 100644 dia/README.md
 create mode 100644 dia/cmd/Uml/main.go
 create mode 100644 dia/go.mod
 create mode 100644 dia/go.sum
 create mode 100644 dia/mkfile

diff --git a/dia/README.md b/dia/README.md
new file mode 100644
index 0000000..49b28c2
--- /dev/null
+++ b/dia/README.md
@@ -0,0 +1,11 @@
+# acme-dia
+
+Programs for previewing diagrams from acme.
+
+- `Uml` accepts PlantUML input, renders the diagram, and passes the result to the `plumber` for preview.
+
+Perhaps others programs in the future.
+
+# Usage
+
+Highlight the diagram text in an acme window. 2-1 chord it to `Uml`.
diff --git a/dia/cmd/Uml/main.go b/dia/cmd/Uml/main.go
new file mode 100644
index 0000000..f7fc2bc
--- /dev/null
+++ b/dia/cmd/Uml/main.go
@@ -0,0 +1,100 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+
+	"9fans.net/go/acme"
+)
+
+var plantumlJar = os.Getenv("HOME") + "/.local/share/plantuml/plantuml.jar"
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func main() {
+	tmpDir := os.Getenv("TMPDIR")
+	if tmpDir == "" {
+		tmpDir = "/tmp"
+	}
+
+	var input string
+
+	// Check if input is from argument (2-1 chord), stdin, or Acme window
+	if len(os.Args) > 1 {
+		input = strings.Join(os.Args[1:], " ")
+	} else if stat, _ := os.Stdin.Stat(); (stat.Mode() & os.ModeCharDevice) == 0 {
+		data, err := io.ReadAll(os.Stdin)
+		if err != nil {
+			log.Fatal(err)
+		}
+		input = string(data)
+	} else {
+		winid := os.Getenv("winid")
+		if winid == "" {
+			log.Fatal("no input provided and not running in acme window")
+		}
+
+		win, err := acme.Open(0, nil)
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer win.CloseFiles()
+
+		body, err := win.ReadAll("body")
+		if err != nil {
+			log.Fatal(err)
+		}
+		input = string(body)
+	}
+
+	if len(input) == 0 {
+		log.Fatal("no input received")
+	}
+
+	// Create temp input file
+	inputFile, err := os.CreateTemp(tmpDir, "plantuml-*.puml")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer os.Remove(inputFile.Name())
+
+	if _, err := inputFile.WriteString(input); err != nil {
+		log.Fatal(err)
+	}
+	inputFile.Close()
+
+	// Run plantuml
+	cmd := exec.Command("java", "-jar", plantumlJar, "-tpng", inputFile.Name())
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Fatalf("plantuml failed: %v\nOutput: %s", err, output)
+	}
+	if len(output) > 0 {
+		fmt.Fprintf(os.Stderr, "PlantUML output: %s\n", output)
+	}
+
+	// PlantUML creates output with .png extension
+	outputFile := strings.TrimSuffix(inputFile.Name(), ".puml") + ".png"
+
+	// Check if output file was created
+	if _, err := os.Stat(outputFile); err != nil {
+		log.Fatalf("output file not created: %v", err)
+	}
+
+	// Plumb the image
+	if err := exec.Command("plumb", outputFile).Run(); err != nil {
+		log.Fatalf("plumb failed: %v", err)
+	}
+
+	fmt.Print(input)
+	fmt.Fprintf(os.Stderr, "%s\n", outputFile)
+}
diff --git a/dia/go.mod b/dia/go.mod
new file mode 100644
index 0000000..e15e9b8
--- /dev/null
+++ b/dia/go.mod
@@ -0,0 +1,5 @@
+module github.com/lkn/acme-dia
+
+go 1.21
+
+require 9fans.net/go v0.0.5
diff --git a/dia/go.sum b/dia/go.sum
new file mode 100644
index 0000000..5089ea2
--- /dev/null
+++ b/dia/go.sum
@@ -0,0 +1,34 @@
+9fans.net/go v0.0.5 h1:u0H3Et5NowdVm56FDD+aWcDOao9zEo+zolNFsr8qyQk=
+9fans.net/go v0.0.5/go.mod h1:Rxvbbc1e+1TyGMjAvLthGTyO97t+6JMQ6ly+Lcs9Uf0=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
+golang.org/x/exp v0.0.0-20210405174845-4513512abef3/go.mod h1:I6l2HNBLBZEcrOoCpyKLdY2lHoRZ8lI4x60KMCQDft4=
+golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
+golang.org/x/mobile v0.0.0-20201217150744-e6ae53a27f4f/go.mod h1:skQtrUTUwhdJvXM/2KKJzY8pDgNr9I/FOMqDVRPBUS4=
+golang.org/x/mobile v0.0.0-20210220033013-bdb1ca9a1e08/go.mod h1:skQtrUTUwhdJvXM/2KKJzY8pDgNr9I/FOMqDVRPBUS4=
+golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.1.1-0.20191209134235-331c550502dd/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.3.1-0.20200828183125-ce943fd02449/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210415045647-66c3f260301c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/tools v0.0.0-20200207183749-b753a1ba74fa/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/dia/mkfile b/dia/mkfile
new file mode 100644
index 0000000..43aae39
--- /dev/null
+++ b/dia/mkfile
@@ -0,0 +1,5 @@
+install:V:
+	go build -o $HOME/bin/Uml ./cmd/Uml
+
+clean:V:
+	rm -f $HOME/bin/Uml