Add function GetRulesToApplyToSourcePath.

editorconfig/apply.go

@@ -0,0 +1,73 @@
+package editorconfig
+
+import (
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+func GetRulesToApplyToSourcePath(sourcePath string, cfs []ConfigFile) map[string]string {
+	applicable := FilterConfigFilesToApplyToSourcePath(sourcePath, cfs)
+	applicableSorted := SortConfigFilesByPrecendence(applicable)
+
+	rules := make(map[string]string)
+
+	for _, cf := range applicableSorted {
+		for _, rule := range cf.DefaultRuleSet {
+			rules[rule.Name] = rule.Value
+		}
+
+		for _, rs := range cf.FileConstrainedRuleSets {
+			if rs.ConstraintRegexp.MatchString(sourcePath) {
+				for _, rule := range rs.Rules {
+					rules[rule.Name] = rule.Value
+				}
+			}
+		}
+	}
+
+	delete(rules, "root")
+
+	return rules
+}
+
+func FilterConfigFilesToApplyToSourcePath(sourcePath string, cfs []ConfigFile) []ConfigFile {
+	applicable := []ConfigFile{}
+
+	for _, cf := range cfs {
+		absSourcePath, err := filepath.Abs(sourcePath)
+		if err != nil {
+			ExitBecauseOfInternalError("Could not get absolute path for " + sourcePath)
+		}
+		absCfDir, err := filepath.Abs(cf.Dir())
+		if err != nil {
+			ExitBecauseOfInternalError("Could not get absolute path for " + cf.Dir())
+		}
+		if strings.HasPrefix(absSourcePath, absCfDir) {
+			applicable = append(applicable, cf)
+		}
+	}
+
+	return applicable
+}
+
+// ByPrecedence implements sort.Interface for []ConfigFile based on how many slashes are in the file's path.
+type ByPrecedence []ConfigFile
+
+func (a ByPrecedence) Len() int {
+	return len(a)
+}
+func (a ByPrecedence) Swap(i, j int) {
+	a[i], a[j] = a[j], a[i]
+}
+func (a ByPrecedence) Less(i, j int) bool {
+	return a[i].Precedence() < a[j].Precedence()
+}
+
+/**
+ * @return Least important files first, most important files last.
+ */
+func SortConfigFilesByPrecendence(cfs []ConfigFile) []ConfigFile {
+	sort.Sort(ByPrecedence(cfs))
+	return cfs
+}