larvit/fejkdata
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Embed the shipped data, load any fs.FS, New takes options, Fake is safe for concurrent use

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Lilleman auf Larv
2026-09-01 23:07:15 +02:00
parent 91cbae2a44
commit f210c7a764
5 changed files with 197 additions and 128 deletions
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cmd/fejkdata/main.go
+25 -16
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@@ -1,10 +1,10 @@
// Command fejkdata prints fake values from one or more data directories.
// Command fejkdata prints fake values from the shipped data and any directories
// layered over it.
//
// fejkdata --data-path ./data/sv_SE person # a full person
// fejkdata --data-path ./data/sv_SE person.last # just the surname
// fejkdata --data-path ./data sv_SE.person # point at the tree, address by folder
// fejkdata --data-path ./data/sv_SE --data-path ./mydata person # layer custom data; last dir wins
// fejkdata --seed 42 --data-path ./data/sv_SE address
// fejkdata sv_SE.person # a full person
// fejkdata sv_SE.person.last # just the surname
// fejkdata --data-path ./mydata sv_SE.person # layer custom data; the last dir wins
// fejkdata --seed 42 sv_SE.address
package main
import (
@@ -23,13 +23,14 @@ const usage = `Usage: fejkdata [flags] <path>
<path> a category, or a dotted path into one (person, person.last)
-d, --data-path D a data directory, e.g. ./data/sv_SE (repeatable; last wins on a clash)
-h, --help print this help, then exit
--list list the paths the data offers, then exit
-n, --repeat N render the path N times (default 1)
-s, --seed N seed for reproducible output
--separator S string between repeated values (default newline)
--version print the version, then exit
-d, --data-path D a data directory to layer over the shipped data (repeatable; last wins on a clash)
-h, --help print this help, then exit
--list list the paths the data offers, then exit
--no-shipped-data load only the --data-path directories
-n, --repeat N render the path N times (default 1)
-s, --seed N seed for reproducible output
--separator S string between repeated values (default newline)
--version print the version, then exit
Flags may come before or after <path>; -- ends the flags.
`
@@ -38,6 +39,7 @@ type invocation struct {
dirs []string
help bool
list bool
noShipped bool
paths []string
repeat int
seed uint64
@@ -57,6 +59,7 @@ var flagDefs = []flagDef{
{"data-path", "d", true, func(in *invocation, v string) error { in.dirs = append(in.dirs, v); return nil }},
{"help", "h", false, func(in *invocation, _ string) error { in.help = true; return nil }},
{"list", "", false, func(in *invocation, _ string) error { in.list = true; return nil }},
{"no-shipped-data", "", false, func(in *invocation, _ string) error { in.noShipped = true; return nil }},
{"repeat", "n", true, func(in *invocation, v string) error {
n, err := strconv.Atoi(v)
if err != nil || n < 1 {
@@ -167,8 +170,8 @@ func run(args []string, stdout, stderr io.Writer) int {
fmt.Fprintln(stdout, "fejkdata "+buildVersion())
return 0
}
if len(in.dirs) == 0 {
return misuse(stderr, errors.New("--data-path is required"))
if in.noShipped && len(in.dirs) == 0 {
return misuse(stderr, errors.New("--no-shipped-data needs at least one --data-path"))
}
if in.list && len(in.paths) > 0 {
return misuse(stderr, errors.New("--list takes no path"))
@@ -178,10 +181,16 @@ func run(args []string, stdout, stderr io.Writer) int {
}
var opts []fejkdata.Option
if in.noShipped {
opts = append(opts, fejkdata.WithoutShippedData())
}
for _, dir := range in.dirs {
opts = append(opts, fejkdata.WithDataPath(dir))
}
if in.seeded {
opts = append(opts, fejkdata.WithSeed(in.seed))
}
f, err := fejkdata.New(in.dirs, opts...)
f, err := fejkdata.New(opts...)
if err != nil {
fmt.Fprintln(stderr, err)
return 1