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cmd: Add --diff option for caddy fmt (#4695)

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Francis Lavoie 2022-04-12 14:49:19 -04:00 committed by GitHub
parent 3e3bb00265
commit 6512832f9f
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2 changed files with 21 additions and 0 deletions
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15
cmd/commandfuncs.go
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@ -32,6 +32,7 @@ import (
"sort"
"strings"
"github.com/aryann/difflib"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
@ -569,6 +570,20 @@ func cmdFmt(fl Flags) (int, error) {
if err := os.WriteFile(formatCmdConfigFile, output, 0600); err != nil {
return caddy.ExitCodeFailedStartup, fmt.Errorf("overwriting formatted file: %v", err)
}
} else if fl.Bool("diff") {
diff := difflib.Diff(
strings.Split(string(input), "\n"),
strings.Split(string(output), "\n"))
for _, d := range diff {
switch d.Delta {
case difflib.Common:
fmt.Printf(" %s\n", d.Payload)
case difflib.LeftOnly:
fmt.Printf("- %s\n", d.Payload)
case difflib.RightOnly:
fmt.Printf("+ %s\n", d.Payload)
}
}
} else {
fmt.Print(string(output))
}

6
cmd/commands.go
View file

@ -282,12 +282,18 @@ human readability. It prints the result to stdout.
If --overwrite is specified, the output will be written to the config file
directly instead of printing it.
If --diff is specified, the output will be compared against the input, and
lines will be prefixed with '-' and '+' where they differ. Note that
unchanged lines are prefixed with two spaces for alignment, and that this
is not a valid patch format.
If you wish you use stdin instead of a regular file, use - as the path.
When reading from stdin, the --overwrite flag has no effect: the result
is always printed to stdout.`,
Flags: func() *flag.FlagSet {
fs := flag.NewFlagSet("fmt", flag.ExitOnError)
fs.Bool("overwrite", false, "Overwrite the input file with the results")
fs.Bool("diff", false, "Print the differences between the input file and the formatted output")
return fs
}(),
})