go.mod: require 1.27.1, and add the gofmt check this lane never had

.github/workflows/ci.yml

@@ -32,6 +32,18 @@ jobs:
       - name: qpdf, the independent oracle for what we write
         run: sudo apt-get update -qq && sudo apt-get install -y -qq qpdf
 
+      # The check this lane never had. The tree was unformatted on main -- two
+      # files, under both 1.26's gofmt and 1.27's -- and nothing said so, because
+      # every sibling repository in the fleet checks gofmt and this one did not.
+      - name: Gofmt
+        run: |
+          out=$(gofmt -l .)
+          if [ -n "$out" ]; then
+            echo "gofmt needs to be run on:"
+            echo "$out"
+            exit 1
+          fi
+
       - name: go vet
         run: go vet ./...
 

font_test.go

@@ -88,11 +88,11 @@ func TestReadPSNameEdgeCases(t *testing.T) {
 	w.u16(3)                // count (claims 3 records)
 	w.u16(uint16(6 + 3*12)) // storage offset
 	// record 0: nameID 1 (skipped)
-	w.u16(3); w.u16(1); w.u16(0); w.u16(1); w.u16(4); w.u16(0)
+	w.u16s(3, 1, 0, 1, 4, 0)
 	// record 1: nameID 6, platform 0 (Unicode UTF-16BE) "Uni"
-	w.u16(0); w.u16(3); w.u16(0); w.u16(6); w.u16(6); w.u16(0)
+	w.u16s(0, 3, 0, 6, 6, 0)
 	// record 2: nameID 6 but offset/length out of range (skipped)
-	w.u16(1); w.u16(0); w.u16(0); w.u16(6); w.u16(0xffff); w.u16(0xffff)
+	w.u16s(1, 0, 0, 6, 0xffff, 0xffff)
 	storage := []byte{0, 'U', 0, 'n', 0, 'i'}
 	w.b = append(w.b, storage...)
 	if s := readPSName(w.b); s != "Uni" {

go.mod

@@ -1,6 +1,6 @@
 module github.com/go-pdfkit/pdfkit
 
-go 1.26.4
+go 1.27.1
 
 require github.com/go-opentype/opentype v0.13.0
 

synth_test.go

@@ -84,6 +84,15 @@ type bw struct{ b []byte }
 
 func (w *bw) u8(v uint8)   { w.b = append(w.b, v) }
 func (w *bw) u16(v uint16) { w.b = binary.BigEndian.AppendUint16(w.b, v) }
+
+// u16s writes several big-endian uint16s, for a record whose fields read better on
+// ONE line -- a name-table record is six numbers in a fixed order, and gofmt splits
+// "w.u16(3); w.u16(1); …" into six lines, which hides that shape.
+func (w *bw) u16s(vs ...uint16) {
+	for _, v := range vs {
+		w.u16(v)
+	}
+}
 func (w *bw) u32(v uint32) { w.b = binary.BigEndian.AppendUint32(w.b, v) }
 func (w *bw) i16(v int16)  { w.u16(uint16(v)) }
 

units.go

@@ -44,11 +44,11 @@ func (s PageSize) Portrait() PageSize {
 
 // Standard ISO 216 A-series and US page sizes, in points.
 var (
-	A3     = PageSize{Width: Mm(297), Height: Mm(420)}
-	A4     = PageSize{Width: Mm(210), Height: Mm(297)}
-	A5     = PageSize{Width: Mm(148), Height: Mm(210)}
-	Letter = PageSize{Width: In(8.5), Height: In(11)}
-	Legal  = PageSize{Width: In(8.5), Height: In(14)}
+	A3      = PageSize{Width: Mm(297), Height: Mm(420)}
+	A4      = PageSize{Width: Mm(210), Height: Mm(297)}
+	A5      = PageSize{Width: Mm(148), Height: Mm(210)}
+	Letter  = PageSize{Width: In(8.5), Height: In(11)}
+	Legal   = PageSize{Width: In(8.5), Height: In(14)}
 	Tabloid = PageSize{Width: In(11), Height: In(17)}
 )