forked from gliderlabs/sigil
/
sigil.go
88 lines (78 loc) · 1.79 KB
/
sigil.go
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package sigil
import (
"bytes"
"fmt"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/mgood/go-posix"
)
var (
TemplatePath []string
PosixPreprocess bool
)
var fnMap = template.FuncMap{}
func Register(fm template.FuncMap) {
for k, v := range fm {
fnMap[k] = v
}
}
func PushPath(path string) {
TemplatePath = append([]string{path}, TemplatePath...)
}
func PopPath() {
_, TemplatePath = TemplatePath[0], TemplatePath[1:]
}
func LookPath(file string) (string, error) {
if strings.HasPrefix(file, "/") {
return file, nil
}
cwd, _ := os.Getwd()
search := append([]string{cwd}, TemplatePath...)
for _, path := range search {
filepath := filepath.Join(path, file)
if _, err := os.Stat(filepath); err == nil {
return filepath, nil
}
}
return "", fmt.Errorf("Not found in path: %s %v", file, TemplatePath)
}
func restoreEnv(env []string) {
os.Clearenv()
for _, kvp := range env {
kv := strings.SplitN(kvp, "=", 2)
os.Setenv(kv[0], kv[1])
}
}
func Execute(input []byte, vars map[string]string, name string) (bytes.Buffer, error) {
var tmplVars string
var err error
defer restoreEnv(os.Environ())
for k, v := range vars {
err := os.Setenv(k, v)
if err != nil {
return bytes.Buffer{}, err
}
escaped := strings.Replace(v, "\"", "\\\"", -1)
tmplVars = tmplVars + fmt.Sprintf("{{ $%s := \"%s\" }}", k, escaped)
}
inputStr := string(input)
if PosixPreprocess {
inputStr, err = posix.ExpandEnv(inputStr)
if err != nil {
return bytes.Buffer{}, err
}
}
inputStr = strings.Replace(inputStr, "\\}}\n{{", "}}{{", -1)
tmpl, err := template.New(name).Funcs(fnMap).Parse(tmplVars + inputStr)
if err != nil {
return bytes.Buffer{}, err
}
var buf bytes.Buffer
err = tmpl.Execute(&buf, vars)
if err != nil {
return bytes.Buffer{}, err
}
return buf, nil
}