go-graphviz v0.5.0

[closer-claudio]

🎯 Why

go-graphviz v0.5.0 is tagged; dot's 1.2.0 release ships on it.

🛠️ What

• go.mod/go.sum: github.com/forkcloser/go-graphviz v0.4.0 → v0.5.0; fogleman/gg and golang/freetype leave the module graph with it.
• v0.5.0 renamed the DOT outputs: graphviz.XDOT is xdot now (layout plus drawing operations) and plain DOT with positions is graphviz.GV. -Tdot keeps its output by mapping to GV; -Txdot is new. Usage and package doc list it.
• cmd/dot/main_test.go: TestRenderFormats asserts pos= in both DOT forms and _draw_ in xdot only (it checked the digraph prefix only, which is why the first push of this PR passed with -Tdot emitting xdot).
• CHANGELOG.md 1.2.0 section: engine v0.5.0, date 2026-10-08, link to the v0.5.0 changelog, -Txdot under Added, and what its users see from 0.5.0 under Changed and Fixed.
• .gitignore: /dot, the binary go build leaves at the root.

🧪 How

• V: just lint (all but links, sandbox) and just test green. Built binary: -Tdot has 0 _draw_ lines, -Txdot has 4.
• U: CI on this PR.

[closer-claudio]

🛑 at 8382fb6, for two reasons. The module bump itself is right; what rides with it is not.

🛑 -Tdot now emits xdot. The body says none of the renamed API, FontLoader or XDOT is referenced. cmd/dot/main.go:85 maps "dot" to graphviz.XDOT, and so does the default at main.go:100. In v0.5.0, XDOT is "xdot" (go-graphviz#78, under Breaking in the 0.5.0 changelog); plain DOT is graphviz.GV. Built from this head, printf 'digraph{a->b}' | dot -Tdot writes four _draw_ lines: the default output of the tool changed from DOT to xdot, and dot -Txdot says unknown format. The tests pass because TestFormats checks only that the output starts with digraph, which xdot does too; I flagged exactly this on go-graphviz#78, and Fluffy's note there said the dot bump would assert on _draw_. Fix: "dot" → graphviz.GV at both sites, add "xdot" → graphviz.XDOT (and the usage line), and have the format test require no _draw_ for -Tdot and _draw_ for -Txdot. -Txdot is then an Added entry for 1.2.0.

🛑 A 12 MB binary is committed. The diff adds dot at the repository root: mode 100755, 12,309,106 bytes, a Mach-O arm64 executable (Bin 0 -> 12309106), the go build output of this checkout. It is not on main, and .gitignore does not list it. Remove it from the commit, and add /dot to .gitignore so the next build can't be committed by accident.

🔍 The bump itself:

• Both go.sum lines for go-graphviz v0.5.0 match sum.golang.org; gg and freetype leave with it, as #81 removed them. go mod tidy -diff is clean; build, vet and the tests pass.
• The 1.2.0 section's claims trace to the 0.5.0 changelog: 320 MB → 7 MB and 30 → 13 ms for the 40-node PNG ("half the time"), WebP with alpha, absolute image paths, a setter's error failing the render. The date moves to 2026-10-08.
• One commit, signed, on the current main.

[closer-claudio]

✅ at f9e7445: both 🛑 are closed.

🔍 Checked on a dot built from this head:

• "dot" maps to graphviz.GV (and is the default), "xdot" to graphviz.XDOT, with the usage line and the package doc naming both. printf 'digraph{a->b}' | dot -Tdot has 3 pos= lines and 0 _draw_; -Txdot has 4 _draw_. TestRenderFormats requires pos= in both forms and _draw_ in xdot alone, so the prefix-only check that let the regression through is gone.
• No dot file is tracked, and .gitignore gains /dot with a comment saying why.
• The CHANGELOG adds -Txdot under Added, keeps -Tdot as positions only, and the body no longer claims XDOT was unreferenced.
• One squashed commit, signed, on the current main; go.mod/go.sum unchanged from my first pass, hashes matching sum.golang.org.

📝 Renovate's #57 is now redundant and, without this code change, wrong; it's @apostasie's to close once this lands.