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Implement --prefix option for prepending custom strings #8

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Merged
toru merged 1 commit into from
Oct 23, 2025
Merged

Implement --prefix option for prepending custom strings #8

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11 changes: 10 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,11 @@ puff uuid --version 7 --time 1687689000
puff uuid --version 7 --time "2025-06-15T10:30:00.123Z"
01977323-90bb-72bb-89d6-86c1cbdd8912

# Print UUIDs with custom prefix
puff uuid -n 2 --compact --prefix "0x"
0x3826b9cce03c926dbebb0c0ed7467356
0x27751047cd3e1314500210ce1477b9ec

# Print UUIDs with custom suffix
puff uuid -n 2 --compact --suffix ".png"
8659b17b768a4ec5b48d1bac08279750.png
Expand All @@ -111,7 +116,11 @@ YPjRDxaUYFkurRAhz0MUzzl8Hh3Y0Z79DZcrJX5R/4g=
puff base64 --url-safe
7KtUKGFAvVHoDdsQDIuRtQ

# Print a URL-safe base64-encoded with custom suffix
# Print a URL-safe base64-encoded value with custom prefix
puff base64 --url-safe --prefix "bucket-x-"
bucket-x-tyIADpZWmW5W04QlCK9TPQ

# Print a URL-safe base64-encoded value with custom suffix
puff base64 --url-safe --suffix ".png"
BvOqihvrdg2kmtPQaxKx6A.png
```
Expand Down
21 changes: 17 additions & 4 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ const (
delimiterParam = "delimiter"
numParam = "num"
outputParam = "output"
prefixParam = "prefix"
suffixParam = "suffix"
timeParam = "time"
urlSafeParam = "url-safe"
Expand Down Expand Up @@ -117,6 +118,7 @@ func printError(w io.Writer, err error) {
// delimiter, except the final value.
func generateHex(c *cli.Context) error {
iterations := c.Int(numParam)
prefix := c.String(prefixParam)
suffix := c.String(suffixParam)

if iterations <= 0 {
Expand All @@ -141,7 +143,7 @@ func generateHex(c *cli.Context) error {
delimiter = defaultDelimiter
}

fmt.Printf("%s%s%s", hex.EncodeToString(src), suffix, delimiter)
fmt.Printf("%s%s%s%s", prefix, hex.EncodeToString(src), suffix, delimiter)
}

return nil
Expand All @@ -153,6 +155,7 @@ func generateUUID(c *cli.Context) error {
version := c.Int(uuidVersionParam)
compact := c.Bool(compactParam)
iterations := c.Int(numParam)
prefix := c.String(prefixParam)
suffix := c.String(suffixParam)

if version != uuidV4 && version != uuidV7 {
Expand Down Expand Up @@ -195,7 +198,7 @@ func generateUUID(c *cli.Context) error {
delimiter = defaultDelimiter
}

fmt.Printf("%s%s%s", line, suffix, delimiter)
fmt.Printf("%s%s%s%s", prefix, line, suffix, delimiter)
}

return nil
Expand All @@ -208,6 +211,7 @@ func generateBase64(c *cli.Context) error {
iterations := c.Int(numParam)
delimiter := resolveDelimiter(c.String(delimiterParam))
urlSafe := c.Bool(urlSafeParam)
prefix := c.String(prefixParam)
suffix := c.String(suffixParam)

if len(delimiter) == 0 {
Expand All @@ -226,9 +230,9 @@ func generateBase64(c *cli.Context) error {
}

if urlSafe {
fmt.Printf("%s%s%s", base64.RawURLEncoding.EncodeToString(src), suffix, delimiter)
fmt.Printf("%s%s%s%s", prefix, base64.RawURLEncoding.EncodeToString(src), suffix, delimiter)
} else {
fmt.Printf("%s%s%s", base64.StdEncoding.EncodeToString(src), suffix, delimiter)
fmt.Printf("%s%s%s%s", prefix, base64.StdEncoding.EncodeToString(src), suffix, delimiter)
}
}

Expand Down Expand Up @@ -310,6 +314,12 @@ func main() {
Value: defaultDelimiter,
}

prefixFlag := &cli.StringFlag{
Name: "prefix",
Aliases: []string{"p"},
Usage: "optional value to prepend to the values",
}

suffixFlag := &cli.StringFlag{
Name: "suffix",
Aliases: []string{"s"},
Expand All @@ -330,6 +340,7 @@ func main() {
Value: 1,
},
delimiterFlag,
prefixFlag,
suffixFlag,
}

Expand Down Expand Up @@ -376,6 +387,7 @@ func main() {
Usage: "timestamp for UUID v7 (iso8601 or unix timestamp)",
},
delimiterFlag,
prefixFlag,
suffixFlag,
},
},
Expand All @@ -401,6 +413,7 @@ func main() {
Usage: "use url-safe encoding",
},
delimiterFlag,
prefixFlag,
suffixFlag,
},
},
Expand Down