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package main |
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import ( |
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"bytes" |
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"flag" |
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"fmt" |
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"io" |
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"os" |
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"olexsmir.xyz/clerk/journal" |
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"olexsmir.xyz/clerk/journal/printer" |
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) |
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func runFormat(args []string) { |
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fs := flag.NewFlagSet("format", flag.ExitOnError) |
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check := fs.Bool("c", false, "Exit code 0 if already formatted, 1 otherwise") |
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diff := fs.Bool("d", false, "Display diffs instead of rewriting files") |
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list := fs.Bool("l", false, "List files whose formatting differs") |
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write := fs.Bool("w", false, "Write result back to file instead of stdout") |
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fs.Usage = func() { |
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fmt.Fprintf(os.Stderr, "Usage: clerk format [flags] [path ...]\n") |
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fs.PrintDefaults() |
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} |
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fs.Parse(args) |
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paths := fs.Args() |
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// Read from stdin if no paths given |
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if len(paths) == 0 { |
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src, err := io.ReadAll(os.Stdin) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "error reading stdin: %v\n", err) |
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os.Exit(1) |
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} |
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pf, err := journal.NewLoader().LoadBytes("stdin", src) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "parse error: %v\n", err) |
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os.Exit(1) |
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} |
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if len(pf.Errors) > 0 { |
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fmt.Fprintf(os.Stderr, "parse error: %v\n", pf.Errors[0].Message) |
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os.Exit(1) |
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} |
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var buf bytes.Buffer |
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if err := printer.Fprint(&buf, pf.Ast); err != nil { |
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fmt.Fprintf(os.Stderr, "format error: %v\n", err) |
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os.Exit(1) |
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} |
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formatted := buf.Bytes() |
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switch { |
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case *check: |
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if bytes.Equal(src, formatted) { |
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os.Exit(0) |
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} |
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os.Exit(1) |
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case *diff: |
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diffLines("stdin", src, formatted) |
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default: |
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os.Stdout.Write(formatted) |
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} |
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return |
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} |
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// Process each file |
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exitCode := 0 |
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for _, path := range paths { |
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info, err := os.Stat(path) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "error: %s: %v\n", path, err) |
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exitCode = 1 |
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continue |
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} |
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if info.IsDir() { |
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fmt.Fprintf(os.Stderr, "error: %s: is a directory\n", path) |
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exitCode = 1 |
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continue |
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} |
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src, err := os.ReadFile(path) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "error: %s: %v\n", path, err) |
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exitCode = 1 |
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continue |
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} |
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pf, err := journal.NewLoader().LoadBytes(path, src) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, "error: %s: %v\n", path, err) |
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exitCode = 1 |
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continue |
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} |
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if len(pf.Errors) > 0 || len(pf.FileErrors) > 0 { |
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fmt.Fprintf(os.Stderr, "error: %s: has errors, refusing to format\n", path) |
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exitCode = 1 |
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continue |
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} |
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var buf bytes.Buffer |
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if err := printer.Fprint(&buf, pf.Ast); err != nil { |
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fmt.Fprintf(os.Stderr, "error: %s: %v\n", path, err) |
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exitCode = 1 |
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continue |
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} |
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formatted := buf.Bytes() |
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changed := !bytes.Equal(src, formatted) |
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switch { |
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case *check: |
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if changed { |
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fmt.Fprintf(os.Stderr, "%s: not formatted\n", path) |
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exitCode = 1 |
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} |
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case *list: |
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if changed { |
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fmt.Println(path) |
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} |
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case *diff: |
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if changed { |
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diffLines(path, src, formatted) |
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} |
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case *write: |
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if changed { |
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if err := os.WriteFile(path, formatted, 0o644); err != nil { |
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fmt.Fprintf(os.Stderr, "error: %s: %v\n", path, err) |
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exitCode = 1 |
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} |
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} |
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default: |
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if _, err := os.Stdout.Write(formatted); err != nil { |
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fmt.Fprintf(os.Stderr, "error writing stdout: %v\n", err) |
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exitCode = 1 |
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} |
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} |
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} |
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os.Exit(exitCode) |
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} |
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func diffLines(path string, src, formatted []byte) { |
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fmt.Printf("--- %s\n+++ %s\n", path, path) |
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srcLines := bytes.Split(src, []byte("\n")) |
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fmtLines := bytes.Split(formatted, []byte("\n")) |
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lines := max(len(fmtLines), len(srcLines)) |
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for i := range lines { |
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var sLine, fLine []byte |
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if i < len(srcLines) { |
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sLine = srcLines[i] |
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} |
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if i < len(fmtLines) { |
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fLine = fmtLines[i] |
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} |
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if !bytes.Equal(sLine, fLine) { |
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if len(sLine) > 0 { |
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fmt.Printf("-%s\n", sLine) |
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} else { |
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fmt.Println("-") |
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} |
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if len(fLine) > 0 { |
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fmt.Printf("+%s\n", fLine) |
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} else { |
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fmt.Println("+") |
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} |
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} |
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} |
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} |