I’m stuck on Stage #JV1
I’ve tried to correct my program but I’m pretty sure my cat command is working as expected. I can cat a file correctly, and I can also cat a file to redirect to another file. I can then cat the file again to see the output correctly.
I think what is happening to the test is that it is trying to cat a file that does not exist.
Here are my logs:
View our article on debugging test failures: How do I debug test failures? - CodeCrafters
codecrafters-shell-go master 2m1s
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Submitting changes (commit: 7186dfb)...
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Running tests on your code. Logs should appear shortly...
[compile] Moved ./.codecrafters/run.sh → ./your_program.sh
[compile] Compilation successful.
Debug = true
[tester::#JV1] Running tests for Stage #JV1 (Redirection - Redirect stdout)
[tester::#JV1] [setup] export PATH=/tmp/strawberry/mango/pineapple:$PATH
[tester::#JV1] Running ./your_program.sh
[tester::#JV1] [setup] echo "banana" > "/tmp/rat/banana"
[tester::#JV1] [setup] echo "pear" > "/tmp/rat/pear"
[tester::#JV1] [setup] echo "strawberry" > "/tmp/rat/strawberry"
[your-program] $ ls -1 /tmp/rat > /tmp/cow/cow.md
[your-program] $ cat /tmp/cow/cow.md
[your-program] banana
[your-program] pear
[your-program] strawberry
[tester::#JV1] ✓ Received redirected file content
[your-program] $ echo Hello Alice 1> /tmp/cow/dog.md
[your-program] $ cat /tmp/cow/dog.md
[your-program] Hello Alice
[tester::#JV1] ✓ Received redirected file content
[your-program] $ cat /tmp/rat/pear nonexistent 1> /tmp/cow/fox.md
[your-program] cat: nonexistent: No such file or directory
[tester::#JV1] ✓ Received error message
[your-program] $ cat /tmp/cow/fox.md
[your-program]
[tester::#JV1] ^ Line does not match expected value.
[tester::#JV1] Expected: "pear"
[tester::#JV1] Received: "" (empty line)
[your-program] $
[tester::#JV1] Test failed
View our article on debugging test failures: https://codecrafters.io/debug
And here’s a snippet of my code:
package main
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"os/exec"
"slices"
"strings"
)
func tokenize(command string) []string {
var tokens []string
var current strings.Builder
inSingleQuote := false
inDoubleQuote := false
escape := false
space := false
for _, ch := range command {
if escape {
current.WriteRune(ch)
escape = false
continue
}
if ch == ' ' && space && !inSingleQuote && !inDoubleQuote {
continue
} else {
space = false
}
switch {
// handling for single and double quotes
case ch == '\'' && !inSingleQuote && !inDoubleQuote:
inSingleQuote = true
case ch == '\'' && inSingleQuote:
inSingleQuote = false
case ch == '"' && !inSingleQuote && !inDoubleQuote:
inDoubleQuote = true
case ch == '"' && inDoubleQuote:
inDoubleQuote = false
case ch == ' ' && !inSingleQuote && !inDoubleQuote:
tokens = append(tokens, current.String())
current.Reset()
space = true
case ch == '\\' && !inSingleQuote:
escape = true
default:
current.WriteRune(ch)
}
}
if current.Len() > 0 {
tokens = append(tokens, current.String())
}
return tokens
}
func processTokens(tokens []string) (string, error) {
builtin := []string{"exit", "echo", "type", "pwd", "cd"}
switch tokens[0] {
case "echo":
echoOutput := fmt.Sprint(strings.Join(tokens[1:], " "))
return echoOutput, nil
case "cat":
files := tokens[1:]
content := []string{}
for _, file := range files {
contentBytes, err := os.ReadFile(file)
if err != nil {
catErrorOutput := fmt.Sprintf("%v: nonexistent: No such file or directory", tokens[0])
catError := errors.New(catErrorOutput)
return "", catError
}
content = append(content, strings.TrimSpace(string(contentBytes)))
}
return strings.Join(content, ""), nil
case "pwd":
wd, err := os.Getwd()
if err != nil {
return "", err
}
return wd, nil
case "type":
for i := 1; i < len(tokens); i++ {
if slices.Contains(builtin, tokens[i]) {
return fmt.Sprintf("%v is a shell builtin", tokens[i]), nil
} else {
path, err := exec.LookPath(tokens[i])
if err != nil {
typeErrorOutput := fmt.Sprint(tokens[i] + ": not found")
typeError := errors.New(typeErrorOutput)
return "", typeError
} else {
return fmt.Sprintf("%v is %v", tokens[i], path), nil
}
}
}
case "cd":
var err error
if tokens[1] == "~" {
homeDir, err := os.UserHomeDir()
if err != nil {
cdErrorOutput := fmt.Sprintf("error geting home directory of user: %v", err)
cdError := errors.New(cdErrorOutput)
return "", cdError
}
err = os.Chdir(homeDir)
} else {
err = os.Chdir(tokens[1])
}
if err != nil {
if errors.Is(err, os.ErrNotExist) {
cdErrorOutput := fmt.Sprintf("cd: %v: No such file or directory", tokens[1])
cdError := errors.New(cdErrorOutput)
return "", cdError
} else {
return fmt.Sprintf("error changing directory: %v", err), nil
}
}
default:
_, err := exec.LookPath(tokens[0])
if err != nil {
return fmt.Sprint(tokens[0] + ": not found"), nil
} else {
cmd := exec.Command(tokens[0], tokens[1:]...)
cmd.Stdin = os.Stdin
output, err := cmd.Output()
if err != nil {
defaultErrorOutput := fmt.Sprintf("couldn't run command: %v: %v", tokens[0], err)
defaultError := errors.New(defaultErrorOutput)
return "", defaultError
}
return strings.TrimSpace(string(output)), nil
}
}
return "", nil
}
func main() {
reader := bufio.NewReader(os.Stdin)
for {
fmt.Print("$ ")
command, err := reader.ReadString('\n')
if err != nil {
if err == io.EOF {
fmt.Println()
break
}
fmt.Fprintln(os.Stderr, "Error reading input", err)
os.Exit(1)
}
command = strings.TrimSpace(command)
tokens := tokenize(command)
if tokens[0] == "exit" {
if len(tokens) > 1 {
fmt.Fprintln(os.Stderr, "exit: too many arguments")
continue
}
return
}
if slices.Contains(tokens, ">") || slices.Contains(tokens, "1>") {
var index int
if slices.Contains(tokens, ">") {
index = slices.Index(tokens, ">")
} else if slices.Contains(tokens, "1>") {
index = slices.Index(tokens, "1>")
}
if index == -1 {
fmt.Println("Could not redirect output")
}
p := tokens[:index]
output, err := processTokens(p)
if err != nil {
fmt.Println(err)
}
//only one file on right side of ">" operator
if len(tokens[index+1:]) != 1 {
fmt.Println("Please enter only one file name")
continue
}
fileName := tokens[index+1:][0]
b := []byte(output)
err = os.WriteFile(fileName, b, 0644)
if err != nil {
fmt.Println("error writing to file:", err)
}
} else {
output, err := processTokens(tokens)
if err != nil {
fmt.Println(err)
} else {
fmt.Println(output)
}
}
}
}
