go-graphviz v0.5.0

.gitignore

@@ -11,6 +11,8 @@ Desktop.ini
 
 # Build output and Go artifacts
 /build
+# `go build` in the root writes the binary here.
+/dot
 
 # Scratch / work-in-progress files
 # *.local

CHANGELOG.md

@@ -7,14 +7,25 @@ command line interface described in `README.md`.
 
 ## [Unreleased]
 
-## [1.2.0] - 2026-10-07
+## [1.2.0] - 2026-10-08
+
+### Added
+
+- `-Txdot`: the layout with its drawing operations, as Graphviz's xdot.
+  `-Tdot` stays the layout with positions only.
 
 ### Changed
 
-- The engine is forkcloser/go-graphviz v0.4.0. Text is measured with the
+- The engine is forkcloser/go-graphviz v0.5.0. Text is measured with the
   fonts it is drawn in, the installed ones, as Graphviz's own `dot` does:
   labels fit their nodes, and the same graph can lay out slightly
   differently, in every output format, on machines with different fonts.
+- PNG and JPEG are drawn the way Graphviz's Cairo renderer draws: lines
+  meet in mitred corners and end flat, where they were round; dashed lines
+  are six points on, six off, and dotted lines two on, six off, Graphviz's
+  lengths. A PNG render of a graph of about 40 nodes allocates 7 MB
+  instead of 320 MB and takes half the time. The binary no longer carries
+  `fogleman/gg` or `golang/freetype`.
 - Font names resolve as Graphviz resolves them (PostScript names, family
   and style words, metric-compatible substitutes), falling back to
   embedded Go fonts in regular, bold, italic and monospace.
@@ -31,9 +42,14 @@ command line interface described in `README.md`.
   a blank page.
 - Characters the label's font lacks (Japanese, Chinese, Korean in a Latin
   font) are drawn from an installed font that has them, not as boxes.
+- A node image named by an absolute path is drawn; it was silently left
+  out. A lossless or extended WebP node image, any WebP with alpha, is
+  sized as it is instead of failing the render as a page too large.
+- An attribute the engine could not store (out of WebAssembly memory)
+  fails the render instead of being dropped.
 
 Details in go-graphviz's
-[CHANGELOG](https://github.com/forkcloser/go-graphviz/blob/v0.4.0/CHANGELOG.md).
+[CHANGELOG](https://github.com/forkcloser/go-graphviz/blob/v0.5.0/CHANGELOG.md).
 
 ## [1.1.1] - 2026-10-05
 

cmd/dot/main.go

@@ -1,4 +1,4 @@
-// Command dot renders a Graphviz graph to dot, svg, png or jpg without a
+// Command dot renders a Graphviz graph to dot, xdot, svg, png or jpg without a
 // native graphviz installation: the engine is go-graphviz's WASM build.
 //
 // Usage:
@@ -28,7 +28,7 @@ const usage = `usage: dot [-K engine] [-T format] [-o path] [input]
 
   -K engine   layout engine: dot (default), neato, fdp, sfdp, circo, twopi,
               osage, patchwork
-  -T format   output format: dot (default), svg, png, jpg
+  -T format   output format: dot (default), xdot, svg, png, jpg
   -o path     output file (default: standard output)
   -V          print the version
   -h          print this help
@@ -77,11 +77,14 @@ func layoutNamed(name string) (graphviz.Layout, bool) {
 	}
 }
 
-// formatNamed is the output format by the name -T takes. "dot" is graphviz's
-// xdot: the layout written back as DOT, with the computed positions on it.
+// formatNamed is the output format by the name -T takes, as Graphviz names
+// them: "dot" is the layout written back as DOT with the computed positions
+// on it, "xdot" that plus the drawing operations.
 func formatNamed(name string) (graphviz.Format, bool) {
 	switch name {
 	case "dot":
+		return graphviz.GV, true
+	case "xdot":
 		return graphviz.XDOT, true
 	case "svg":
 		return graphviz.SVG, true
@@ -97,7 +100,7 @@ func formatNamed(name string) (graphviz.Format, bool) {
 // parseArgs accepts graphviz's glued flags (-Tpng) as well as spaced ones,
 // which the standard flag package cannot do.
 func parseArgs(args []string) (options, error) {
-	opt := options{layout: graphviz.DOT, format: graphviz.XDOT}
+	opt := options{layout: graphviz.DOT, format: graphviz.GV}
 
 	// A spaced value flag consumes the argument after it, so the loop moves
 	// the index itself rather than ranging over the slice.

cmd/dot/main_test.go

@@ -20,7 +20,7 @@ func TestParseArgs(t *testing.T) {
 		want options
 		err  bool
 	}{
-		{nil, options{layout: graphviz.DOT, format: graphviz.XDOT}, false},
+		{nil, options{layout: graphviz.DOT, format: graphviz.GV}, false},
 		{
 			[]string{"-Tpng", "-oout.png", "in.dot"},
 			options{layout: graphviz.DOT, format: graphviz.PNG, output: "out.png", input: "in.dot"},
@@ -31,8 +31,8 @@ func TestParseArgs(t *testing.T) {
 			options{layout: graphviz.NEATO, format: graphviz.SVG, output: "out.svg", input: "-"},
 			false,
 		},
-		{[]string{"-h"}, options{layout: graphviz.DOT, format: graphviz.XDOT, help: true}, false},
-		{[]string{"-V"}, options{layout: graphviz.DOT, format: graphviz.XDOT, version: true}, false},
+		{[]string{"-h"}, options{layout: graphviz.DOT, format: graphviz.GV, help: true}, false},
+		{[]string{"-V"}, options{layout: graphviz.DOT, format: graphviz.GV, version: true}, false},
 		{[]string{"-Tgif"}, options{}, true},
 		{[]string{"-Kbogus"}, options{}, true},
 		{[]string{"-o"}, options{}, true},
@@ -56,10 +56,11 @@ func TestRenderFormats(t *testing.T) {
 	t.Parallel()
 
 	magic := map[string]string{
-		"dot": "digraph",
-		"svg": "<?xml",
-		"png": "\x89PNG",
-		"jpg": "\xff\xd8\xff",
+		"dot":  "digraph",
+		"xdot": "digraph",
+		"svg":  "<?xml",
+		"png":  "\x89PNG",
+		"jpg":  "\xff\xd8\xff",
 	}
 	for format, want := range magic {
 		var out, errb bytes.Buffer
@@ -72,6 +73,19 @@ func TestRenderFormats(t *testing.T) {
 		if !strings.HasPrefix(out.String(), want) {
 			t.Errorf("-T%s: output does not start with %q: %q", format, want, out.String()[:min(16, out.Len())])
 		}
+
+		// Both DOT forms carry the layout; only xdot carries the drawing
+		// operations. The two were the same output before go-graphviz 0.5.0
+		// named them apart.
+		if format == "dot" || format == "xdot" {
+			if !strings.Contains(out.String(), "pos=") {
+				t.Errorf("-T%s: output has no positions", format)
+			}
+
+			if drawn := strings.Contains(out.String(), "_draw_"); drawn != (format == "xdot") {
+				t.Errorf("-T%s: _draw_ present = %v", format, drawn)
+			}
+		}
 	}
 }
 

go.mod

@@ -2,11 +2,9 @@ module github.com/forkcloser/dot
 
 go 1.26.0
 
-require github.com/forkcloser/go-graphviz v0.4.0
+require github.com/forkcloser/go-graphviz v0.5.0
 
 require (
-	github.com/fogleman/gg v1.3.0 // indirect
-	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/tetratelabs/wazero v1.12.0 // indirect
 	golang.org/x/image v0.46.0 // indirect
 	golang.org/x/sys v0.48.0 // indirect

go.sum

@@ -1,9 +1,5 @@
-github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
-github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
-github.com/forkcloser/go-graphviz v0.4.0 h1:NCpzxoQtQB0hL3mm4zSwi3bdO9tgBtPJNyHrFabmsqY=
-github.com/forkcloser/go-graphviz v0.4.0/go.mod h1:eAWRQF8m4fwtzgh1U8K+PNiYskteXC6aV4+ft/cinFk=
-github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
-github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/forkcloser/go-graphviz v0.5.0 h1:gJeM9OmNFkTIRkZ3u6X6+XHRM9tFRY12Ic/E6LtfkLg=
+github.com/forkcloser/go-graphviz v0.5.0/go.mod h1:EbSWnUlAz5sNUrAeWXI45Fiy074kdsvwXuVuD8nO5Eo=
 github.com/tetratelabs/wazero v1.12.0 h1:DuWcpNu/FzgEXgGBDp8J1Spc+CWOvvtvVyjKlaZopYU=
 github.com/tetratelabs/wazero v1.12.0/go.mod h1:LvKtzl2RqO4gyF27BiXU+nKAjcV8f38U+kP/q2vgxh0=
 golang.org/x/image v0.46.0 h1:b1+oYj0Jbp6K5MDT4i4/eZpYlk3V8SJhhDKh6LBHAyQ=