customize theme colors in d2-config

ci/release/changelogs/next.md

@@ -1,5 +1,6 @@
 #### Features 🚀
 
+- Themes can be customized via `d2-config` vars. [#1777](https://github.com/terrastruct/d2/pull/1777)
 - Icons can be added for special objects (sql_table, class, code, markdown, latex). [#1774](https://github.com/terrastruct/d2/pull/1774)
 
 #### Improvements 🧹

d2cli/main.go

@@ -845,13 +845,15 @@ func _render(ctx context.Context, ms *xmain.State, plugin d2plugin.Plugin, opts
 		scale = go2.Pointer(1.)
 	}
 	svg, err := d2svg.Render(diagram, &d2svg.RenderOpts{
-		Pad:         opts.Pad,
-		Sketch:      opts.Sketch,
-		Center:      opts.Center,
-		ThemeID:     opts.ThemeID,
-		DarkThemeID: opts.DarkThemeID,
-		MasterID:    opts.MasterID,
-		Scale:       scale,
+		Pad:                opts.Pad,
+		Sketch:             opts.Sketch,
+		Center:             opts.Center,
+		ThemeID:            opts.ThemeID,
+		DarkThemeID:        opts.DarkThemeID,
+		MasterID:           opts.MasterID,
+		ThemeOverrides:     opts.ThemeOverrides,
+		DarkThemeOverrides: opts.DarkThemeOverrides,
+		Scale:              scale,
 	})
 	if err != nil {
 		return nil, err

d2compiler/compile.go

@@ -17,6 +17,7 @@ import (
 	"oss.terrastruct.com/d2/d2ir"
 	"oss.terrastruct.com/d2/d2parser"
 	"oss.terrastruct.com/d2/d2target"
+	"oss.terrastruct.com/d2/lib/color"
 	"oss.terrastruct.com/d2/lib/textmeasure"
 )
 
@@ -54,7 +55,11 @@ func Compile(p string, r io.Reader, opts *CompileOptions) (*d2graph.Graph, *d2ta
 	g.FS = opts.FS
 	g.SortObjectsByAST()
 	g.SortEdgesByAST()
-	return g, compileConfig(ir), nil
+	config, err := compileConfig(ir)
+	if err != nil {
+		return nil, nil, err
+	}
+	return g, config, nil
 }
 
 func compileIR(ast *d2ast.Map, m *d2ir.Map) (*d2graph.Graph, error) {
@@ -1336,10 +1341,10 @@ func parentSeqDiagram(n d2ir.Node) *d2ir.Map {
 	}
 }
 
-func compileConfig(ir *d2ir.Map) *d2target.Config {
+func compileConfig(ir *d2ir.Map) (*d2target.Config, error) {
 	f := ir.GetField("vars", "d2-config")
 	if f == nil || f.Map() == nil {
-		return nil
+		return nil, nil
 	}
 
 	configMap := f.Map()
@@ -1375,5 +1380,87 @@ func compileConfig(ir *d2ir.Map) *d2target.Config {
 		config.LayoutEngine = go2.Pointer(f.Primary().Value.ScalarString())
 	}
 
-	return config
+	f = configMap.GetField("theme-overrides")
+	if f != nil {
+		overrides, err := compileThemeOverrides(f.Map())
+		if err != nil {
+			return nil, err
+		}
+		config.ThemeOverrides = overrides
+	}
+	f = configMap.GetField("dark-theme-overrides")
+	if f != nil {
+		overrides, err := compileThemeOverrides(f.Map())
+		if err != nil {
+			return nil, err
+		}
+		config.DarkThemeOverrides = overrides
+	}
+
+	return config, nil
+}
+
+func compileThemeOverrides(m *d2ir.Map) (*d2target.ThemeOverrides, error) {
+	if m == nil {
+		return nil, nil
+	}
+	themeOverrides := d2target.ThemeOverrides{}
+
+	err := &d2parser.ParseError{}
+FOR:
+	for _, f := range m.Fields {
+		switch strings.ToUpper(f.Name) {
+		case "N1":
+			themeOverrides.N1 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "N2":
+			themeOverrides.N2 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "N3":
+			themeOverrides.N3 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "N4":
+			themeOverrides.N4 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "N5":
+			themeOverrides.N5 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "N6":
+			themeOverrides.N6 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "N7":
+			themeOverrides.N7 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "B1":
+			themeOverrides.B1 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "B2":
+			themeOverrides.B2 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "B3":
+			themeOverrides.B3 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "B4":
+			themeOverrides.B4 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "B5":
+			themeOverrides.B5 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "B6":
+			themeOverrides.B6 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "AA2":
+			themeOverrides.AA2 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "AA4":
+			themeOverrides.AA4 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "AA5":
+			themeOverrides.AA5 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "AB4":
+			themeOverrides.AB4 = go2.Pointer(f.Primary().Value.ScalarString())
+		case "AB5":
+			themeOverrides.AB5 = go2.Pointer(f.Primary().Value.ScalarString())
+		default:
+			err.Errors = append(err.Errors, d2parser.Errorf(f.LastPrimaryKey(), fmt.Sprintf(`"%s" is not a valid theme code`, f.Name)).(d2ast.Error))
+			continue FOR
+		}
+		if !go2.Contains(color.NamedColors, strings.ToLower(f.Primary().Value.ScalarString())) && !color.ColorHexRegex.MatchString(f.Primary().Value.ScalarString()) {
+			err.Errors = append(err.Errors, d2parser.Errorf(f.LastPrimaryKey(), fmt.Sprintf(`expected "%s" to be a valid named color ("orange") or a hex code ("#f0ff3a")`, f.Name)).(d2ast.Error))
+		}
+	}
+
+	if !err.Empty() {
+		return nil, err
+	}
+
+	if themeOverrides != (d2target.ThemeOverrides{}) {
+		return &themeOverrides, nil
+	}
+	return nil, nil
 }

d2compiler/compile_test.go

@@ -2812,6 +2812,21 @@ g: |md
 d2/testdata/d2compiler/TestCompile/text_no_label.d2:15:1: block string cannot be empty
 d2/testdata/d2compiler/TestCompile/text_no_label.d2:4:1: shape text must have a non-empty label
 d2/testdata/d2compiler/TestCompile/text_no_label.d2:7:1: shape text must have a non-empty label`,
+		},
+		{
+			name: "var-not-color",
+			text: `vars: {
+  d2-config: {
+    theme-overrides: {
+      B1: potato
+			potato: B1
+    }
+  }
+}
+a
+`,
+			expErr: `d2/testdata/d2compiler/TestCompile/var-not-color.d2:4:7: expected "B1" to be a valid named color ("orange") or a hex code ("#f0ff3a")
+d2/testdata/d2compiler/TestCompile/var-not-color.d2:5:4: "potato" is not a valid theme code`,
 		},
 		{
 			name: "no_arrowheads_in_shape",

d2graph/d2graph.go

@@ -252,15 +252,15 @@ func (s *Style) Apply(key, value string) error {
 		if s.Stroke == nil {
 			break
 		}
-		if !go2.Contains(namedColors, strings.ToLower(value)) && !colorHexRegex.MatchString(value) {
+		if !go2.Contains(color.NamedColors, strings.ToLower(value)) && !color.ColorHexRegex.MatchString(value) {
 			return errors.New(`expected "stroke" to be a valid named color ("orange") or a hex code ("#f0ff3a")`)
 		}
 		s.Stroke.Value = value
 	case "fill":
 		if s.Fill == nil {
 			break
 		}
-		if !go2.Contains(namedColors, strings.ToLower(value)) && !colorHexRegex.MatchString(value) {
+		if !go2.Contains(color.NamedColors, strings.ToLower(value)) && !color.ColorHexRegex.MatchString(value) {
 			return errors.New(`expected "fill" to be a valid named color ("orange") or a hex code ("#f0ff3a")`)
 		}
 		s.Fill.Value = value
@@ -347,7 +347,7 @@ func (s *Style) Apply(key, value string) error {
 		if s.FontColor == nil {
 			break
 		}
-		if !go2.Contains(namedColors, strings.ToLower(value)) && !colorHexRegex.MatchString(value) {
+		if !go2.Contains(color.NamedColors, strings.ToLower(value)) && !color.ColorHexRegex.MatchString(value) {
 			return errors.New(`expected "font-color" to be a valid named color ("orange") or a hex code ("#f0ff3a")`)
 		}
 		s.FontColor.Value = value

d2ir/compile.go

@@ -169,7 +169,7 @@ func (c *compiler) validateConfigs(configs *Field) {
 	for _, f := range configs.Map().Fields {
 		var val string
 		if f.Primary() == nil {
-			if f.Name != "theme-colors" {
+			if f.Name != "theme-overrides" && f.Name != "dark-theme-overrides" {
 				c.errorf(f.LastRef().AST(), `"%s" needs a value`, f.Name)
 				continue
 			}
@@ -184,7 +184,7 @@ func (c *compiler) validateConfigs(configs *Field) {
 				c.errorf(f.LastRef().AST(), `expected a boolean for "%s", got "%s"`, f.Name, val)
 				continue
 			}
-		case "theme-colors":
+		case "theme-overrides", "dark-theme-overrides":
 			if f.Map() == nil {
 				c.errorf(f.LastRef().AST(), `"%s" needs a map`, f.Name)
 				continue

d2lib/d2.go

@@ -188,6 +188,8 @@ func applyConfigs(config *d2target.Config, compileOpts *CompileOptions, renderOp
 	if renderOpts.Center == nil {
 		renderOpts.Center = config.Center
 	}
+	renderOpts.ThemeOverrides = config.ThemeOverrides
+	renderOpts.DarkThemeOverrides = config.DarkThemeOverrides
 }
 
 func applyDefaults(compileOpts *CompileOptions, renderOpts *d2svg.RenderOpts) {

d2renderers/d2animate/d2animate.go

@@ -76,7 +76,7 @@ func Wrap(rootDiagram *d2target.Diagram, svgs [][]byte, renderOpts d2svg.RenderO
 
 	d2svg.EmbedFonts(buf, diagramHash, svgsStr, rootDiagram.FontFamily, rootDiagram.GetNestedCorpus())
 
-	themeStylesheet, err := d2svg.ThemeCSS(diagramHash, renderOpts.ThemeID, renderOpts.DarkThemeID)
+	themeStylesheet, err := d2svg.ThemeCSS(diagramHash, renderOpts.ThemeID, renderOpts.DarkThemeID, renderOpts.ThemeOverrides, renderOpts.DarkThemeOverrides)
 	if err != nil {
 		return nil, err
 	}