forked from ondrajz/go-callvis
/
dot.go
165 lines (140 loc) · 3.09 KB
/
dot.go
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package main
import (
"bytes"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"text/template"
)
var (
minlen uint
nodesep float64
)
// location of dot executable for converting from .dot to .svg
// it's usually at: /usr/bin/dot
var dotExe string
func dotToImage(dot []byte) (string, error) {
if dotExe == "" {
dot, err := exec.LookPath("dot")
if err != nil {
log.Fatalln("unable to find program 'dot', please install it or check your PATH")
}
dotExe = dot
}
img := filepath.Join(os.TempDir(), fmt.Sprintf("go-callvis_export.svg"))
cmd := exec.Command(dotExe, "-Tsvg", "-o", img)
cmd.Stdin = bytes.NewReader(dot)
if err := cmd.Run(); err != nil {
return "", err
}
return img, nil
}
const (
FontTitle = "Consolas"
FontNode = "Tahoma"
)
const tmplCluster = `{{define "cluster" -}}
{{printf "subgraph %q {" .}}
{{printf "%s" .Attrs.Lines}}
{{range .Nodes}}
{{template "node" .}}
{{- end}}
{{range .Clusters}}
{{template "cluster" .}}
{{- end}}
{{println "}" }}
{{- end}}`
const tmplNode = `{{define "edge" -}}
{{printf "%q -> %q [ %s ]" .From .To .Attrs}}
{{- end}}`
const tmplEdge = `{{define "node" -}}
{{printf "%q [ %s ]" .ID .Attrs}}
{{- end}}`
const tmplGraph = `digraph gocallvis {
label="{{.Title}}";
labeljust="l";
fontname="Arial";
fontsize="14";
rankdir="LR";
bgcolor="lightgray";
style="solid";
penwidth="0.5";
pad="0.0";
nodesep="{{.Options.nodesep}}";
node [shape="ellipse" style="filled" fillcolor="honeydew" fontname="Verdana" penwidth="1.0" margin="0.05,0.0"];
edge [minlen="{{.Options.minlen}}"]
{{template "cluster" .Cluster}}
{{- range .Edges}}
{{template "edge" .}}
{{- end}}
}
`
func WriteDot(w io.Writer, g *dotGraph) error {
t := template.New("dot")
for _, s := range []string{tmplCluster, tmplNode, tmplEdge, tmplGraph} {
if _, err := t.Parse(s); err != nil {
return err
}
}
var buf bytes.Buffer
if err := t.Execute(&buf, g); err != nil {
return err
}
_, err := buf.WriteTo(w)
return err
}
type dotGraph struct {
Title string
Minlen uint
Attrs dotAttrs
Cluster *dotCluster
Nodes []*dotNode
Edges []*dotEdge
Options map[string]string
}
type dotCluster struct {
ID string
Clusters map[string]*dotCluster
Nodes []*dotNode
Attrs dotAttrs
}
func NewDotCluster(id string) *dotCluster {
return &dotCluster{
ID: id,
Clusters: make(map[string]*dotCluster),
Attrs: make(dotAttrs),
}
}
func (c *dotCluster) String() string {
return fmt.Sprintf("cluster_%s", c.ID)
}
type dotNode struct {
ID string
Attrs dotAttrs
}
func (n *dotNode) String() string {
return n.ID
}
type dotEdge struct {
From *dotNode
To *dotNode
Attrs dotAttrs
}
type dotAttrs map[string]string
func (p dotAttrs) List() []string {
l := []string{}
for k, v := range p {
l = append(l, fmt.Sprintf("%s=%q", k, v))
}
return l
}
func (p dotAttrs) String() string {
return strings.Join(p.List(), " ")
}
func (p dotAttrs) Lines() string {
return fmt.Sprintf("%s;", strings.Join(p.List(), ";\n"))
}