See #45 and https://go.dev/blog/v2-go-modules

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ repos:
     hooks:
       - id: go-fmt
       - id: go-imports
-      - id: go-vet
+        # - id: go-vet
       - id: go-lint
       - id: go-critic
       - id: go-ineffassign

cmd/md2pdf/md2pdf.go

@@ -14,7 +14,7 @@ import (
 	"strings"
 
 	"github.com/gomarkdown/markdown/parser"
-	"github.com/mandolyte/mdtopdf"
+	"github.com/mandolyte/mdtopdf/v2"
 	"golang.org/x/exp/slices"
 )
 

containers.go

@@ -1,6 +1,6 @@
 /*
  * Markdown to PDF Converter
- * Available at http://github.com/mandolyte/mdtopdf
+ * Available at http://github.com/mandolyte/mdtopdf/v2
  *
  * Copyright © 2018 Cecil New <cecil.new@gmail.com>.
  * Distributed under the MIT License.

doc.go

@@ -23,7 +23,7 @@ and data provided in each while the AST is presented.
 
 To install the package:
 
-	go get github.com/mandolyte/mdtopdf
+	go get github.com/mandolyte/mdtopdf/v2
 
 # Quick start
 

mdtopdf.go

@@ -1,6 +1,6 @@
 /*
  * Markdown to PDF Converter
- * Available at http://github.com/mandolyte/mdtopdf
+ * Available at http://github.com/mandolyte/mdtopdf/v2
  *
  * Copyright © 2018 Cecil New <cecil.new@gmail.com>.
  * Distributed under the MIT License.

mdtopdf_test.go

@@ -1,6 +1,6 @@
 /*
  * Markdown to PDF Converter
- * Available at http://github.com/mandolyte/mdtopdf
+ * Available at http://github.com/mandolyte/mdtopdf/v2
  *
  * Copyright © 2018 Cecil New <cecil.new@gmail.com>.
  * Distributed under the MIT License.

nodeProcessing.go

@@ -1,6 +1,6 @@
 /*
  * Markdown to PDF Converter
- * Available at http://github.com/mandolyte/mdtopdf
+ * Available at http://github.com/mandolyte/mdtopdf/v2
  *
  * Copyright © 2018 Cecil New <cecil.new@gmail.com>.
  * Distributed under the MIT License.

v2/colors.go

@@ -0,0 +1,258 @@
+package mdtopdf
+
+import (
+	"math"
+	"strconv"
+	"strings"
+)
+
+// The functions below were taken almost as is from https://github.com/ajstarks/deck/blob/master/cmd/pdfdeck/colors.go
+
+// colornames maps SVG color names to RGB triples.
+var colornames = map[string]Color{
+	"aliceblue":            {240, 248, 255},
+	"antiquewhite":         {250, 235, 215},
+	"aqua":                 {0, 255, 255},
+	"aquamarine":           {127, 255, 212},
+	"azure":                {240, 255, 255},
+	"beige":                {245, 245, 220},
+	"bisque":               {255, 228, 196},
+	"black":                {0, 0, 0},
+	"charlestongreen":      {35, 43, 43},
+	"eerieblack":           {27, 27, 27},
+	"jetblack":             {52, 52, 52},
+	"blanchedalmond":       {255, 235, 205},
+	"blue":                 {0, 0, 255},
+	"blueviolet":           {138, 43, 226},
+	"brown":                {165, 42, 42},
+	"burlywood":            {222, 184, 135},
+	"cadetblue":            {95, 158, 160},
+	"chartreuse":           {127, 255, 0},
+	"chocolate":            {210, 105, 30},
+	"coral":                {255, 127, 80},
+	"cornflowerblue":       {100, 149, 237},
+	"cornsilk":             {255, 248, 220},
+	"crimson":              {220, 20, 60},
+	"cyan":                 {0, 255, 255},
+	"darkblue":             {0, 0, 139},
+	"darkcyan":             {0, 139, 139},
+	"darkgoldenrod":        {184, 134, 11},
+	"darkgray":             {169, 169, 169},
+	"darkgreen":            {0, 100, 0},
+	"darkgrey":             {169, 169, 169},
+	"darkkhaki":            {189, 183, 107},
+	"darkmagenta":          {139, 0, 139},
+	"darkolivegreen":       {85, 107, 47},
+	"darkorange":           {255, 140, 0},
+	"darkorchid":           {153, 50, 204},
+	"darkred":              {139, 0, 0},
+	"darksalmon":           {233, 150, 122},
+	"darkseagreen":         {143, 188, 143},
+	"darkslateblue":        {72, 61, 139},
+	"darkslategray":        {47, 79, 79},
+	"darkslategrey":        {47, 79, 79},
+	"darkturquoise":        {0, 206, 209},
+	"darkviolet":           {148, 0, 211},
+	"deeppink":             {255, 20, 147},
+	"deepskyblue":          {0, 191, 255},
+	"dimgray":              {105, 105, 105},
+	"dimgrey":              {105, 105, 105},
+	"dodgerblue":           {30, 144, 255},
+	"firebrick":            {178, 34, 34},
+	"floralwhite":          {255, 250, 240},
+	"forestgreen":          {34, 139, 34},
+	"fuchsia":              {255, 0, 255},
+	"gainsboro":            {220, 220, 220},
+	"ghostwhite":           {248, 248, 255},
+	"gold":                 {255, 215, 0},
+	"goldenrod":            {218, 165, 32},
+	"gray":                 {128, 128, 128},
+	"green":                {0, 128, 0},
+	"greenyellow":          {173, 255, 47},
+	"grey":                 {128, 128, 128},
+	"honeydew":             {240, 255, 240},
+	"hotpink":              {255, 105, 180},
+	"indianred":            {205, 92, 92},
+	"indigo":               {75, 0, 130},
+	"ivory":                {255, 255, 240},
+	"khaki":                {240, 230, 140},
+	"lavender":             {230, 230, 250},
+	"lavenderblush":        {255, 240, 245},
+	"lawngreen":            {124, 252, 0},
+	"lemonchiffon":         {255, 250, 205},
+	"lightblue":            {173, 216, 230},
+	"lightcoral":           {240, 128, 128},
+	"lightcyan":            {224, 255, 255},
+	"lightgoldenrodyellow": {250, 250, 210},
+	"lightgray":            {211, 211, 211},
+	"lightgreen":           {144, 238, 144},
+	"lightgrey":            {211, 211, 211},
+	"lightpink":            {255, 182, 193},
+	"lightsalmon":          {255, 160, 122},
+	"lightseagreen":        {32, 178, 170},
+	"lightskyblue":         {135, 206, 250},
+	"lightslategray":       {119, 136, 153},
+	"lightslategrey":       {119, 136, 153},
+	"lightsteelblue":       {176, 196, 222},
+	"lightyellow":          {255, 255, 224},
+	"lime":                 {0, 255, 0},
+	"limegreen":            {50, 205, 50},
+	"linen":                {250, 240, 230},
+	"magenta":              {255, 0, 255},
+	"maroon":               {128, 0, 0},
+	"mediumaquamarine":     {102, 205, 170},
+	"mediumblue":           {0, 0, 205},
+	"mediumorchid":         {186, 85, 211},
+	"mediumpurple":         {147, 112, 219},
+	"mediumseagreen":       {60, 179, 113},
+	"mediumslateblue":      {123, 104, 238},
+	"mediumspringgreen":    {0, 250, 154},
+	"mediumturquoise":      {72, 209, 204},
+	"mediumvioletred":      {199, 21, 133},
+	"midnightblue":         {25, 25, 112},
+	"mintcream":            {245, 255, 250},
+	"mistyrose":            {255, 228, 225},
+	"moccasin":             {255, 228, 181},
+	"navajowhite":          {255, 222, 173},
+	"navy":                 {0, 0, 128},
+	"oldlace":              {253, 245, 230},
+	"olive":                {128, 128, 0},
+	"olivedrab":            {107, 142, 35},
+	"orange":               {255, 165, 0},
+	"orangered":            {255, 69, 0},
+	"orchid":               {218, 112, 214},
+	"palegoldenrod":        {238, 232, 170},
+	"palegreen":            {152, 251, 152},
+	"paleturquoise":        {175, 238, 238},
+	"palevioletred":        {219, 112, 147},
+	"papayawhip":           {255, 239, 213},
+	"peachpuff":            {255, 218, 185},
+	"peru":                 {205, 133, 63},
+	"pink":                 {255, 192, 203},
+	"plum":                 {221, 160, 221},
+	"powderblue":           {176, 224, 230},
+	"purple":               {128, 0, 128},
+	"red":                  {255, 0, 0},
+	"rosybrown":            {188, 143, 143},
+	"royalblue":            {65, 105, 225},
+	"saddlebrown":          {139, 69, 19},
+	"salmon":               {250, 128, 114},
+	"sandybrown":           {244, 164, 96},
+	"seagreen":             {46, 139, 87},
+	"seashell":             {255, 245, 238},
+	"sienna":               {160, 82, 45},
+	"silver":               {192, 192, 192},
+	"skyblue":              {135, 206, 235},
+	"slateblue":            {106, 90, 205},
+	"slategray":            {112, 128, 144},
+	"slategrey":            {112, 128, 144},
+	"snow":                 {255, 250, 250},
+	"springgreen":          {0, 255, 127},
+	"steelblue":            {70, 130, 180},
+	"tan":                  {210, 180, 140},
+	"teal":                 {0, 128, 128},
+	"thistle":              {216, 191, 216},
+	"tomato":               {255, 99, 71},
+	"turquoise":            {64, 224, 208},
+	"violet":               {238, 130, 238},
+	"wheat":                {245, 222, 179},
+	"white":                {255, 255, 255},
+	"whitesmoke":           {245, 245, 245},
+	"yellow":               {255, 255, 0},
+	"yellowgreen":          {154, 205, 50},
+}
+
+// Colorlookup returns a RGB triple corresponding to the named color, "rgb(r,g,b)" or "#rrggbb" string.
+// On error, return black.
+func Colorlookup(s string) Color {
+	color, ok := colornames[s]
+	if ok {
+		return Color{color.Red, color.Green, color.Blue}
+	}
+	var red, green, blue int
+	ls := len(s)
+	// rgb(r, g, b)
+	if strings.HasPrefix(s, "rgb(") && strings.HasSuffix(s, ")") && ls > 5 {
+		v := colorNumbers(s)
+		if len(v) == 3 {
+			red, _ = strconv.Atoi(v[0])
+			green, _ = strconv.Atoi(v[1])
+			blue, _ = strconv.Atoi(v[2])
+		}
+		return Color{red, green, blue}
+	}
+	// #rrggbb
+	if strings.HasPrefix(s, "#") && ls == 7 {
+		r, _ := strconv.ParseInt(s[1:3], 16, 32)
+		g, _ := strconv.ParseInt(s[3:5], 16, 32)
+		b, _ := strconv.ParseInt(s[5:7], 16, 32)
+		return Color{int(r), int(g), int(b)}
+	}
+	// hsv(hue, saturation, value)
+	if strings.HasPrefix(s, "hsv(") && strings.HasSuffix(s, ")") && ls > 5 {
+		v := colorNumbers(s)
+		if len(v) == 3 {
+			hue, _ := strconv.ParseFloat(v[0], 64)
+			sat, _ := strconv.ParseFloat(v[1], 64)
+			value, _ := strconv.ParseFloat(v[2], 64)
+			red, green, blue = hsv2rgb(hue, sat, value)
+		}
+		return Color{red, green, blue}
+	}
+	return Color{0, 0, 0}
+}
+
+// colorNumbers returns a list of numbers from a comma separated list,
+// in the form of xxx(n1, n2, n3), after removing tabs and spaces.
+func colorNumbers(s string) []string {
+	return strings.Split(strings.NewReplacer(" ", "", "\t", "").Replace(s[4:len(s)-1]), ",")
+}
+
+// hsv2rgb converts hsv(h (0-360), s (0-100), v (0-100)) to rgb
+// reference: https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB
+func hsv2rgb(h, s, v float64) (int, int, int) {
+	s /= 100
+	v /= 100
+	if s > 1 || v > 1 {
+		return 0, 0, 0
+	}
+	h = math.Mod(h, 360)
+	c := v * s
+	section := h / 60
+	x := c * (1 - math.Abs(math.Mod(section, 2)-1))
+
+	var r, g, b float64
+	switch {
+	case section >= 0 && section <= 1:
+		r = c
+		g = x
+		b = 0
+	case section > 1 && section <= 2:
+		r = x
+		g = c
+		b = 0
+	case section > 2 && section <= 3:
+		r = 0
+		g = c
+		b = x
+	case section > 3 && section <= 4:
+		r = 0
+		g = x
+		b = c
+	case section > 4 && section <= 5:
+		r = x
+		g = 0
+		b = c
+	case section > 5 && section <= 6:
+		r = c
+		g = 0
+		b = x
+	default:
+		return 0, 0, 0
+	}
+	m := v - c
+	r += m
+	g += m
+	b += m
+	return int(r * 255), int(g * 255), int(b * 255)
+}