shell/shell.go
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package shell
import (
"bytes"
"context"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"j3s.sh/zoa/utils"
"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
// this is used to detect when the script
// name changes from run to run, which allows
// us to prettily-print
var lastScriptPath string
var ctx = context.Background()
// TODO: make dis a git dingy
var rootDir = "test/"
func RunCommands(scriptPath string, r *interp.Runner) {
script, err := parseFile(scriptPath)
if err != nil {
fmt.Println("error in " + scriptPath)
fmt.Println(err)
os.Exit(1)
}
// execute every statement individually, decorating
// each with ->, and doing some speshul logicks against
// certain strings
for _, stmt := range script.Stmts {
cmdName := commandName(stmt)
command, after, _ := strings.Cut(cmdName, " ")
if command == "zoa-script" {
// recursion detected!! :3
subScriptPath := filepath.Join(rootDir + "scripts/" + after)
RunCommands(subScriptPath, r)
continue
}
if command == "zoa-file" {
// after = "nginx /etc/nginx/conf.d/jesse.conf systemctl nginx reload"
zoaFileParts := strings.Split(after, " ")
if len(zoaFileParts) < 2 {
log.Fatal("zoa-file requires 2+ arguments")
}
src := zoaFileParts[0]
dst := zoaFileParts[1]
optionalCmd := ""
if len(zoaFileParts) > 2 {
optionalCmd = strings.Join(zoaFileParts[2:], " ")
}
fmt.Printf("$ zoa-file %s %s\n", src, dst)
dstChanged, err := zoaCopy(src, dst)
if err != nil {
log.Fatal(err)
}
// if there's an optional argument
if optionalCmd != "" && dstChanged {
re := strings.NewReader(optionalCmd)
f, err := syntax.NewParser().Parse(re, "")
if err != nil {
log.Fatal(err)
}
for _, stmt := range f.Stmts {
runCommand(ctx, stmt, r)
}
}
return
}
// if the script name changed between runs,
// print it
if scriptPath != lastScriptPath {
utils.BluePrintln("-> " + scriptPath)
lastScriptPath = scriptPath
}
fmt.Printf("$ %s\n", cmdName)
err = r.Run(ctx, stmt)
if err != nil {
// ignore err here bc it's just the status code
os.Exit(1)
}
}
}
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 runCommand(c context.Context, s *syntax.Stmt, r *interp.Runner) {
name := commandName(s)
fmt.Printf("$ %s\n", name)
err := r.Run(c, s)
if err != nil {
os.Exit(1)
}
}
func commandName(statement *syntax.Stmt) string {
b := new(bytes.Buffer)
syntax.NewPrinter().Print(b, statement)
return b.String()
}
// zoaCopy copies a file from zoaRoot/scripts/src to dst.
// if the dst was changed, zoaCopy will return true,
// otherwise it will return false
// zoaCopy defaults to 0666 for permissions (before umask)
func zoaCopy(src string, dst string) (bool, error) {
src = filepath.Join(rootDir + "scripts/" + src)
srcChk, err := utils.ChecksumFile(src)
if err != nil {
// source file should always exist, return error
return false, err
}
dstChk, err := utils.ChecksumFile(dst)
if err != nil {
// dstfile may not exist for a million
// reasons, set checksum to blank
// to force a mismatch
dstChk = ""
}
if srcChk == dstChk {
fmt.Println("file unchanged")
return false, nil
}
// TODO: pass the file through a templating engine
// - expand vars
// - loop support?
err = utils.Copy(src, dst)
if err != nil {
return false, err
}
return true, nil
}