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add output flag to the diff command #8

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add output flag to the diff command #8

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25 changes: 21 additions & 4 deletions cmd/pgdesigner/commands.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import (
"encoding/json"
"flag"
"fmt"
"io"
"log"
"os"
"path/filepath"
Expand Down Expand Up @@ -177,8 +178,9 @@ func printIssues(issues []lint.Issue, errors int, outputFmt string) {
func runDiff(args []string) {
fs := flag.NewFlagSet("diff", flag.ExitOnError)
outputFmt := fs.String("f", "sql", "output format: sql, json")
outputFile := fs.String("o", "", "a pathname of an output file. Creates a file if it doesn't exist, overwrites otherwise. Output format is determined by the -f flag")
fs.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: pgdesigner diff [-f sql|json] <old.pgd> <new.pgd>\n\nFlags:\n")
fmt.Fprintf(os.Stderr, "Usage: pgdesigner diff [-f sql|json] [-o file] <old.pgd> <new.pgd>\n\nFlags:\n")
fs.PrintDefaults()
}
_ = fs.Parse(args)
Expand All @@ -204,13 +206,28 @@ func runDiff(args []string) {
return
}

var w io.Writer = os.Stdout

if outputFile != nil && *outputFile != "" {
f, err := os.Create(*outputFile)
if err != nil {
log.Fatalf("failed to open %s: %v", *outputFile, err)
}
defer f.Close()
w = io.MultiWriter(os.Stdout, f)
}

switch *outputFmt {
case "json":
enc := json.NewEncoder(os.Stdout)
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
_ = enc.Encode(result.Changes)
if err := enc.Encode(result.Changes); err != nil {
log.Fatalf("failed to encode JSON: %v", err)
}
default:
fmt.Print(result.SQL())
if _, err := fmt.Fprint(w, result.SQL()); err != nil {
log.Fatalf("failed to write output: %v", err)
}
}

if result.HasHazards() {
Expand Down