shell/shell.go
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package shell
import (
"bytes"
"context"
"fmt"
"log"
"os"
"strings"
"j3s.sh/zoa/color"
"j3s.sh/zoa/utils"
maybeio "github.com/google/renameio/maybe"
"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
func Run(r *interp.Runner, script string) {
f, err := parseFile(script)
if err != nil {
log.Fatal(err)
}
ctx := context.TODO()
for _, stmt := range f.Stmts {
// 14:8
pos := stmt.Pos()
ctx = context.WithValue(ctx, "position", pos)
err = r.Run(ctx, stmt)
if err != nil {
// we yell but keep plowing forward
// twirling, twirling
color.ZoaYell(fmt.Sprintf("%s:%s: %s", script, pos, err.Error()))
}
}
}
func CallHandler(ctx context.Context, args []string) ([]string, error) {
command := args[0]
fmt.Println()
// shell tips go here
if command == "echo" {
color.ZoaSay(`prefer printf over echo!
ex: printf '%s\n' "hello world!"`)
}
fmt.Printf("$ %s\n", strings.Join(args, " "))
return args, nil
}
func parseFile(filename string) (*syntax.File, error) {
var result = &syntax.File{}
f, err := os.Open(filename)
if err != nil {
return result, err
}
defer f.Close()
result, err = syntax.NewParser().Parse(f, "")
return result, err
}
func ZoaFmt(script string) {
f, err := os.Open(script)
if err != nil {
log.Fatal(err)
}
defer f.Close()
p := syntax.NewParser()
syntax.KeepComments(true)(p)
syntax.Variant(syntax.LangPOSIX)(p)
node, err := p.Parse(f, "")
if err != nil {
return
}
var writeBuf bytes.Buffer
syntax.NewPrinter().Print(&writeBuf, node)
res := writeBuf.Bytes()
info, err := os.Lstat(script)
if err != nil {
log.Fatal(err)
}
perm := info.Mode().Perm()
// TODO: remove maybeio when golang implements atomic writing
if err := maybeio.WriteFile(script, res, perm); err != nil {
log.Fatal(err)
}
}
// ZoaCopy copies a file from src to dst, optionally modifying its mode.
// zoaCopy defaults to 0666 for permissions (before umask)
func ZoaCopy(src string, dst string, mode os.FileMode) {
srcChk, err := utils.ChecksumFile(src)
if err != nil {
// source file should always exist, return error
fmt.Println(err)
os.Exit(1)
}
dstChk, err := utils.ChecksumFile(dst)
if err != nil {
// dstfile may not exist for a million
// reasons, set checksum to blank
// to force a mismatch
// TODO: why did i do this? revise errors.
dstChk = ""
}
// TODO: templating engine?
// - expand vars
// - loop support?
if srcChk != dstChk {
err = utils.Copy(src, dst)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}
fi, err := os.Lstat(dst)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
if fi.Mode().Perm() != mode {
err = os.Chmod(dst, mode)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}
}