commit a1db7dd9ba949bc1a738ca271fe4ed2c82ae1882
Author: Julian Daube <joposter@gmail.com>
Date:   Tue Feb 5 00:30:06 2019 +0100

    initial commit

diff --git a/Library.go b/Library.go
new file mode 100644
index 0000000..a9f1885
--- /dev/null
+++ b/Library.go
@@ -0,0 +1,238 @@
+package geagle
+
+import (
+	"encoding/xml"
+	"io"
+	"strconv"
+	"strings"
+)
+
+type Boolean string
+
+func True() Boolean {
+	return "yes"
+}
+
+func False() Boolean {
+	return "no"
+}
+
+func (b Boolean) ToBool() bool {
+	return b == "yes" || b == "on"
+}
+
+type Rotation string
+
+func (r Rotation) Angle() int {
+	s := strings.TrimPrefix(string(r), "R")
+	v, _ := strconv.Atoi(s)
+	return v
+}
+
+// Layer definition
+type Layer struct {
+	Number int    `xml:"number,attr"`
+	Name   string `xml:"name,attr"`
+	Color  int    `xml:"color,attr"`
+
+	Fill    int     `xml:"fill,attr"`
+	Visible Boolean `xml:"visible,attr"`
+	Active  Boolean `xml:"active,attr"`
+}
+
+// Grid definition
+type Grid struct {
+	Distance float32 `xml:"distance,attr"`
+	Unitdist string  `xml:"unitdist,attr"`
+	Unit     string  `xml:"unit,attr"`
+	Style    string  `xml:"style,attr"`
+	Multiple int     `xml:"multiple,attr"`
+	Display  Boolean `xml:"display,attr"`
+
+	// Alternative Grid Information
+	AlternativeDistance     float32 `xml:"altdistance,attr"`
+	AlternativeDistanceUnit string  `xml:"altunitdist,attr"`
+	AlternativeUnit         string  `xml:"altunit,attr"`
+}
+
+type Point struct {
+	X float32 `xml:"x,attr"`
+	Y float32 `xml:"y,attr"`
+}
+type Hole struct {
+	Point
+	Drill string `xml:"drill,attr"`
+}
+
+type Line struct {
+	X1 float32 `xml:"x1,attr"`
+	X2 float32 `xml:"x2,attr"`
+	Y1 float32 `xml:"y1,attr"`
+	Y2 float32 `xml:"y2,attr"`
+}
+type Wire struct {
+	Line
+	Width float32 `xml:"width,attr"`
+	Layer int     `xml:"layer,attr"`
+	Curve float64 `xml:"curve,attr,omitempty"`
+	Cap   string  `xml:"cap,attr,omitempty"`
+}
+
+type Pad struct {
+	Point
+	Name     string   `xml:"name,attr"`
+	Drill    float32  `xml:"drill,attr"`
+	Shape    string   `xml:"shape,attr"`
+	Rotation Rotation `xml:"rot,attr,omitempty"`
+}
+type SmdPad struct {
+	Point
+	Name   string  `xml:"name,attr"`
+	Width  float32 `xml:"dx,attr"`
+	Height float32 `xml:"dy,attr"`
+	Layer  int     `xml:"layer,attr"`
+}
+
+type Text struct {
+	Point
+	Size      float32 `xml:"size,attr"`
+	Layer     int     `xml:"layer,attr"`
+	Alignment string  `xml:"align,attr,omitempty"`
+	Ratio     int     `xml:"ratio,attr,omitempty"`
+	Text      string  `xml:",innerxml"`
+}
+
+type Circle struct {
+	Point
+	Radius float32 `xml:"radius,attr"`
+	Width  float32 `xml:"width,attr"`
+	Layer  int     `xml:"layer,attr"`
+}
+
+type Rectangle struct {
+	Line
+	Layer int `xml:"layer,attr"`
+}
+
+type Primitives struct {
+	Wires     []Wire      `xml:"wire"`
+	Circles   []Circle    `xml:"circle"`
+	Texts     []Text      `xml:"text"`
+	Rectangle []Rectangle `xml:"rectangle"`
+}
+
+type Package struct {
+	Name        string `xml:"name,attr"`
+	Description string `xml:"description"`
+	Urn         string `xml:"urn,attr,omitempty"`
+
+	Primitives
+	Holes   []Hole   `xml:"hole"`
+	Pads    []Pad    `xml:"pad"`
+	SmdPads []SmdPad `xml:"smd"`
+}
+
+type Pin struct {
+	Point
+	Name      string   `xml:"name,attr"`
+	Visible   string   `xml:"visible,attr,omitempty"`
+	Length    string   `xml:"length,attr,omitempty"`
+	Direction string   `xml:"direction,attr,omitempty"`
+	Rotation  Rotation `xml:"rot,attr,omitempty"`
+	Function  string   `xml:"function,attr,omitempty"`
+}
+
+type Symbol struct {
+	Name string `xml:"name,attr"`
+	Urn  string `xml:"urn,attr,omitempty"`
+
+	Primitives
+	Pins []Pin `xml:"pin"`
+}
+
+type Gate struct {
+	Point
+	Name   string `xml:"name,attr"`
+	Symbol string `xml:"symbol,attr"`
+}
+
+type Technology struct {
+	Name string `xml:"name,attr"`
+}
+
+type Connection struct {
+	Gate string `xml:"gate,attr"`
+	Pin  string `xml:"pin,attr"`
+	Pad  string `xml:"pad,attr"`
+}
+
+type Package3d struct {
+	Urn string `xml:"package3d_urn,attr"`
+}
+
+type Device struct {
+	Name    string `xml:"name,attr"`
+	Package string `xml:"package,attr"`
+
+	Package3d    []Package3d  `xml:package3dinstances>package3dinstance"`
+	Technologies []Technology `xml:"technologies>technology"`
+	Connections  []Connection `xml:"connects>connect"`
+}
+
+type Deviceset struct {
+	Name        string `xml:"name,attr"`
+	Prefix      string `xml:"prefix,attr"`
+	Description string `xml:"description,omitempty"`
+	Urn         string `xml:"urn,attr,omitempty"`
+
+	Gates   []Gate   `xml:"gates>gate"`
+	Devices []Device `xml:"devices>device"`
+}
+
+type Library struct {
+	Packages   []Package   `xml:"packages>package"`
+	Symbols    []Symbol    `xml:"symbols>symbol"`
+	Devicesets []Deviceset `xml:"devicesets>deviceset"`
+}
+
+type Drawing struct {
+	Grid    Grid    `xml:"grid"`
+	Layers  []Layer `xml:"layers>layer"`
+	Library Library `xml:"library"`
+}
+
+type FileHeader struct {
+	Version string `xml:"version,attr"`
+}
+
+func ParseLibrary(in io.Reader) (result Drawing, err error) {
+	file := struct {
+		Eagle   FileHeader
+		Drawing Drawing `xml:"drawing"`
+	}{}
+
+	decoder := xml.NewDecoder(in)
+	err = decoder.Decode(&file)
+	return file.Drawing, err
+}
+
+// defines an eagle file
+type eagle struct {
+	FileHeader
+	Drawing *Drawing `xml:"drawing"`
+}
+
+func (drw *Drawing) WriteTo(out io.Writer) error {
+	// write DOCTYPE and xml header
+	io.WriteString(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>")
+	io.WriteString(out, "<!DOCTYPE eagle SYSTEM \"eagle.dtd\">")
+
+	encoder := xml.NewEncoder(out)
+
+	file := eagle{
+		FileHeader: FileHeader{"8.3.2"},
+		Drawing:    drw,
+	}
+
+	return encoder.Encode(&file)
+}