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make2help.go
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make2help.go
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package make2help
import (
"bufio"
"os"
"regexp"
"strings"
"golang.org/x/xerrors"
)
const (
builtInTargetPhony = ".PHONY"
builtInTargetSuffixes = ".SUFFIXES"
builtInTargetDefault = ".DEFAULT"
builtInTargetPrecious = ".PRECIOUS"
builtInTargetIntermediate = ".INTERMEDIATE"
builtInTargetSecondary = ".SECONDARY"
builtInTargetSecondExpansion = ".SECONDEXPANSION"
builtInTargetDeleteOnError = ".DELETE_ON_ERROR"
builtInTargetIgnore = ".IGNORE"
builtInTargetLowResolutionTime = ".LOW_RESOLUTION_TIME"
builtInTargetSilent = ".SILENT"
builtInTargetExportAllVariables = ".EXPORT_ALL_VARIABLES"
builtInTargetNotParallel = ".NOTPARALLEL"
builtInTargetOneShell = ".ONESHELL"
builtInTargetPosix = ".POSIX"
)
var (
ruleReg = regexp.MustCompile(`^(\S+):`)
isBuiltInTargets = map[string]bool{
builtInTargetPhony: true,
builtInTargetSuffixes: true,
builtInTargetDefault: true,
builtInTargetPrecious: true,
builtInTargetIntermediate: true,
builtInTargetSecondary: true,
builtInTargetSecondExpansion: true,
builtInTargetDeleteOnError: true,
builtInTargetIgnore: true,
builtInTargetLowResolutionTime: true,
builtInTargetSilent: true,
builtInTargetExportAllVariables: true,
builtInTargetNotParallel: true,
builtInTargetOneShell: true,
builtInTargetPosix: true,
}
)
func scan(filepath string) (rules, error) {
f, err := os.Open(filepath)
if err != nil {
return nil, xerrors.Errorf("failed to open file: %w", err)
}
r := rules{}
buf := []string{}
sc := bufio.NewScanner(f)
for sc.Scan() {
line := sc.Text()
if strings.HasPrefix(line, "## ") {
buf = append(buf, line[3:])
continue
}
if matches := ruleReg.FindStringSubmatch(line); len(matches) > 1 {
target := matches[1]
if isBuiltInTargets[target] {
continue
}
r[target] = buf
}
if len(buf) > 0 {
buf = []string{}
}
}
if err = sc.Err(); err != nil {
return nil, xerrors.Errorf("scan failed: %w", err)
}
return r, nil
}