/
newer.go
85 lines (75 loc) · 1.72 KB
/
newer.go
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package builtin
import (
"os"
"time"
"github.com/c4s4/neon/neon/build"
"github.com/c4s4/neon/neon/util"
)
func init() {
build.AddBuiltin(build.BuiltinDesc{
Name: "newer",
Func: newer,
Help: `Tells if source files are newer than result ones.
Arguments:
- sources: source file(s) (may not exist).
- results: result file(s) (may not exist).
Returns:
- A boolean that tells if source files are newer than result ones.
If source files don't exist, returns false.
If result files don't exist, returns true.
Examples:
# generate PDF if source Markdown changed
if newer("source.md", "result.pdf") {
compile("source.md")
}
# generate binary if source files are newer than generated binary
if newer(find(".", "**/*.go"), "bin/binary") {
generateBinary()
}`,
})
}
func newer(sources, results interface{}) bool {
if sources == nil {
return false
}
if results == nil {
return true
}
sourceFiles, err := util.ToSliceString(sources)
if err != nil {
panic("source must be a string or list of strings")
}
resultFiles, err := util.ToSliceString(results)
if err != nil {
panic("result must be a string or list of strings")
}
var sourceTime time.Time
for _, source := range sourceFiles {
info, err := os.Stat(source)
if err != nil {
continue
}
t := info.ModTime()
if sourceTime.IsZero() || t.Before(sourceTime) {
sourceTime = t
}
}
if sourceTime.IsZero() {
return false
}
var resultTime time.Time
for _, result := range resultFiles {
info, err := os.Stat(result)
if err != nil {
continue
}
t := info.ModTime()
if resultTime.IsZero() || t.After(resultTime) {
resultTime = t
}
}
if resultTime.IsZero() {
return true
}
return sourceTime.After(resultTime)
}