129 lines
2.7 KiB
Go
129 lines
2.7 KiB
Go
package complete
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import (
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"os"
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"path/filepath"
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)
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// Predicate determines what terms can follow a command or a flag
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type Predicate struct {
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// Predictor is function that returns list of arguments that can
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// come after the flag/command
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Predictor func(last string) []Option
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}
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// Or unions two predicate struct, so that the result predicate
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// returns the union of their predication
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func (p *Predicate) Or(other *Predicate) *Predicate {
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if p == nil || other == nil {
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return nil
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}
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return &Predicate{
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Predictor: func(last string) []Option { return append(p.predict(last), other.predict(last)...) },
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}
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}
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func (p *Predicate) predict(last string) []Option {
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if p == nil || p.Predictor == nil {
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return nil
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}
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return p.Predictor(last)
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}
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var (
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PredictNothing *Predicate = nil
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PredictAnything = &Predicate{}
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PredictDirs = &Predicate{Predictor: dirs}
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)
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func PredictSet(options ...string) *Predicate {
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return &Predicate{
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Predictor: func(last string) []Option {
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ret := make([]Option, len(options))
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for i := range options {
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ret[i] = Arg(options[i])
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}
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return ret
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},
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}
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}
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func PredictFiles(pattern string) *Predicate {
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return &Predicate{Predictor: glob(pattern)}
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}
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func dirs(last string) (options []Option) {
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dir := dirFromLast(last)
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return dirsAt(dir)
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}
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func dirsAt(path string) []Option {
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dirs := []string{}
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filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
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if info.IsDir() {
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dirs = append(dirs, path)
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}
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return nil
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})
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if !filepath.IsAbs(path) {
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filesToRel(dirs)
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}
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return filesToOptions(dirs)
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}
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func glob(pattern string) func(last string) []Option {
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return func(last string) []Option {
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dir := dirFromLast(last)
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files, err := filepath.Glob(filepath.Join(dir, pattern))
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if err != nil {
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Log("failed glob operation with pattern '%s': %s", pattern, err)
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}
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if !filepath.IsAbs(pattern) {
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filesToRel(files)
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}
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return filesToOptions(files)
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}
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}
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func filesToRel(files []string) {
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wd, err := os.Getwd()
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if err != nil {
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return
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}
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for i := range files {
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abs, err := filepath.Abs(files[i])
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if err != nil {
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continue
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}
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rel, err := filepath.Rel(wd, abs)
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if err != nil {
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continue
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}
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if rel == "." {
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rel = ""
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}
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files[i] = "./" + rel
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}
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return
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}
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func filesToOptions(files []string) []Option {
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options := make([]Option, len(files))
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for i, f := range files {
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options[i] = ArgFileName(f)
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}
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return options
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}
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// dirFromLast gives the directory of the current written
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// last argument if it represents a file name being written.
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// in case that it is not, we fall back to the current directory.
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func dirFromLast(last string) string {
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dir := filepath.Dir(last)
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_, err := os.Stat(dir)
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if err != nil {
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return "./"
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}
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return dir
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}
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