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graphviz_dot.go
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graphviz_dot.go
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// +build !graphviz
package main
import (
"fmt"
"log"
"os"
"path/filepath"
"strings"
)
func write(f *os.File, data string) {
_, err := f.WriteString(data)
if err != nil {
log.Panicln(err)
}
}
func createHeader(f *os.File) {
write(f, fmt.Sprintln("digraph \"\" {"))
write(f, fmt.Sprintln("\tgraph [ rankdir=LR ];"))
}
func createNode(name string, f *os.File, nodes map[string]struct{}) {
if _, ok := nodes[name]; ok {
return
}
write(f, fmt.Sprintf("\t\"%s\"\t[ style=bold ];\n", name))
nodes[name] = struct{}{}
}
func createLine(from, to string, f *os.File) {
format := "\t\"%s\" -> \"%s\" [ key=\"%s\", URL=\"#%s->%s\", style=bold ];\n"
write(f, fmt.Sprintf(format, from, to, from, from, to))
}
func createFooter(f *os.File) {
write(f, fmt.Sprintln("}"))
}
func resultToSvg(result map[string][]string) {
fn := *graphResultFile
if !strings.HasSuffix(fn, ".dot") {
fn += ".dot"
}
f, err := os.Create(fn)
if err != nil {
log.Panicln("open result file failed", result, err)
}
defer f.Close()
createHeader(f)
nodes := make(map[string]struct{})
for from, tos := range result {
createNode(from, f, nodes)
for _, to := range tos {
createNode(to, f, nodes)
createLine(from, to, f)
}
}
createFooter(f)
err = f.Close()
if err != nil {
log.Panicln(err)
}
if *graphResultFile == fn {
fmt.Println("result saved to " + *graphResultFile)
} else {
fmt.Println("\ninstall graphviz and run the following command to generate result file:")
format := strings.Trim(filepath.Ext(*graphResultFile), ".")
fmt.Printf("dot -T%v %v -o %v\n\n", format, fn, *graphResultFile)
}
}