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package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/varlink/go/varlink/idl"
)
func readFileToString(path string) (string, error) {
content, err := ioutil.ReadFile(path)
if err != nil {
return "", err
}
return string(content), nil
}
func exit(err error) {
fmt.Println(err.Error())
os.Exit(1)
}
func typeToString(input *idl.Type) string {
switch input.Kind {
case idl.TypeString:
return "string"
case idl.TypeBool:
return "bool"
case idl.TypeFloat:
return "float"
case idl.TypeArray:
result := input.ElementType.Alias
if result == "" {
return fmt.Sprintf("[]%s", typeToString(input.ElementType))
}
return result
case idl.TypeAlias:
return input.Alias
case idl.TypeMap:
return "map[string]"
case idl.TypeInt:
return "int"
}
return ""
}
func typeToLink(input string) string {
switch input {
case "string":
return "https://godoc.org/builtin#string"
case "int":
return "https://godoc.org/builtin#int"
case "bool":
return "https://godoc.org/builtin#bool"
case "float":
return "https://golang.org/src/builtin/builtin.go#L58"
default:
return fmt.Sprintf("#%s", input)
}
}
type funcArgs struct {
paramName string
paramKind string
}
type funcDescriber struct {
Name string
inputParams []funcArgs
returnParams []funcArgs
doc string
}
type typeAttrs struct {
Name string
AttrType string
}
type typeDescriber struct {
Name string
doc string
Attrs []typeAttrs
}
type err struct {
Name string
doc string
}
// collects defined types in the idl
func getTypes(tidl *idl.IDL) []typeDescriber {
var types []typeDescriber
for _, x := range tidl.Aliases {
i := typeDescriber{
Name: x.Name,
doc: x.Doc,
}
ta := []typeAttrs{}
for _, y := range x.Type.Fields {
result := typeToString(y.Type)
ta = append(ta, typeAttrs{Name: y.Name, AttrType: result})
}
i.Attrs = ta
types = append(types, i)
}
return types
}
// collects defined methods in the idl
func getMethods(midl *idl.IDL) []funcDescriber {
var methods []funcDescriber
for _, t := range midl.Methods {
m := funcDescriber{
Name: t.Name,
doc: t.Doc,
}
fa := []funcArgs{}
fo := []funcArgs{}
for _, i := range t.In.Fields {
fa = append(fa, funcArgs{paramName: i.Name, paramKind: typeToString(i.Type)})
}
for _, f := range t.Out.Fields {
fo = append(fo, funcArgs{paramName: f.Name, paramKind: typeToString(f.Type)})
}
m.inputParams = fa
m.returnParams = fo
methods = append(methods, m)
}
return methods
}
// collects defined errors in the idl
func getErrors(midl *idl.IDL) []err {
var errors []err
for _, e := range midl.Errors {
myError := err{
Name: e.Name,
doc: e.Doc,
}
errors = append(errors, myError)
}
return errors
}
// generates the index for the top of the markdown page
func generateIndex(methods []funcDescriber, types []typeDescriber, errors []err, b bytes.Buffer) bytes.Buffer {
for _, method := range methods {
var inArgs []string
var outArgs []string
for _, inArg := range method.inputParams {
inArgs = append(inArgs, fmt.Sprintf("%s: %s", inArg.paramName, inArg.paramKind))
}
for _, outArg := range method.returnParams {
outArgs = append(outArgs, fmt.Sprintf("%s", outArg.paramKind))
}
b.WriteString(fmt.Sprintf("\n[func %s(%s) %s](#%s)\n", method.Name, strings.Join(inArgs, ", "), strings.Join(outArgs, ", "), method.Name))
}
for _, t := range types {
b.WriteString(fmt.Sprintf("[type %s](#%s)\n\n", t.Name, t.Name))
}
for _, e := range errors {
b.WriteString(fmt.Sprintf("[error %s](#%s)\n\n", e.Name, e.Name))
}
return b
}
// performs the output for defined methods
func generateFuncDescriptions(methods []funcDescriber, b bytes.Buffer) bytes.Buffer {
for _, method := range methods {
b.WriteString(fmt.Sprintf("### <a name=\"%s\"></a>func %s\n", method.Name, method.Name))
var inArgs []string
var outArgs []string
for _, inArg := range method.inputParams {
inArgs = append(inArgs, fmt.Sprintf("%s: [%s](%s)", inArg.paramName, inArg.paramKind, typeToLink(inArg.paramKind)))
}
for _, outArg := range method.returnParams {
outArgs = append(outArgs, fmt.Sprintf("[%s](%s)", outArg.paramKind, typeToLink(outArg.paramKind)))
}
b.WriteString(fmt.Sprintf("<div style=\"background-color: #E8E8E8; padding: 15px; margin: 10px; border-radius: 10px;\">\n\nmethod %s(%s) %s</div>", method.Name, strings.Join(inArgs, ", "), strings.Join(outArgs, ", ")))
b.WriteString("\n")
b.WriteString(method.doc)
b.WriteString("\n")
}
return b
}
// performs the output for defined types/structs
func generateTypeDescriptions(types []typeDescriber, b bytes.Buffer) bytes.Buffer {
for _, t := range types {
b.WriteString(fmt.Sprintf("### <a name=\"%s\"></a>type %s\n", t.Name, t.Name))
b.WriteString(fmt.Sprintf("\n%s\n", t.doc))
for _, i := range t.Attrs {
b.WriteString(fmt.Sprintf("\n%s [%s](%s)\n", i.Name, i.AttrType, typeToLink(i.AttrType)))
}
}
return b
}
// performs the output for defined errors
func generateErrorDescriptions(errors []err, b bytes.Buffer) bytes.Buffer {
for _, e := range errors {
b.WriteString(fmt.Sprintf("### <a name=\"%s\"></a>type %s\n", e.Name, e.Name))
b.WriteString(fmt.Sprintf("\n%s\n", e.doc))
}
return b
}
func main() {
args := os.Args
if len(args) < 2 {
exit(fmt.Errorf("you must provide an input and output path"))
}
varlinkFile := args[1]
mdFile := args[2]
varlinkInput, err := readFileToString(varlinkFile)
if err != nil {
exit(err)
}
varlinkInput = strings.TrimRight(varlinkInput, "\n")
// Run the idl parser
midl, err := idl.New(varlinkInput)
if err != nil {
exit(err)
}
// Collect up the info from the idl
methods := getMethods(midl)
types := getTypes(midl)
errors := getErrors(midl)
out := bytes.Buffer{}
out.WriteString("## Index\n")
out = generateIndex(methods, types, errors, out)
out.WriteString("## Methods\n")
out = generateFuncDescriptions(methods, out)
out.WriteString("## Types\n")
out = generateTypeDescriptions(types, out)
out.WriteString("## Errors\n")
out = generateErrorDescriptions(errors, out)
ioutil.WriteFile(mdFile, out.Bytes(), 0755)
}
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