Add ~emersion/go-scfg as a subdirectory

1 files changed, 55 insertions, 0 deletions

diff --git a/scfg/scfg.go b/scfg/scfg.go
new file mode 100644
index 0000000..6f20b49
--- /dev/null
+++ b/scfg/scfg.go
@@ -0,0 +1,55 @@
+// Package scfg parses and formats configuration files.
+package scfg
+
+import (
+	"fmt"
+)
+
+// Block is a list of directives.
+type Block []*Directive
+
+// GetAll returns a list of directives with the provided name.
+func (blk Block) GetAll(name string) []*Directive {
+	l := make([]*Directive, 0, len(blk))
+	for _, child := range blk {
+		if child.Name == name {
+			l = append(l, child)
+		}
+	}
+	return l
+}
+
+// Get returns the first directive with the provided name.
+func (blk Block) Get(name string) *Directive {
+	for _, child := range blk {
+		if child.Name == name {
+			return child
+		}
+	}
+	return nil
+}
+
+// Directive is a configuration directive.
+type Directive struct {
+	Name   string
+	Params []string
+
+	Children Block
+
+	lineno int
+}
+
+// ParseParams extracts parameters from the directive. It errors out if the
+// user hasn't provided enough parameters.
+func (d *Directive) ParseParams(params ...*string) error {
+	if len(d.Params) < len(params) {
+		return fmt.Errorf("directive %q: want %v params, got %v", d.Name, len(params), len(d.Params))
+	}
+	for i, ptr := range params {
+		if ptr == nil {
+			continue
+		}
+		*ptr = d.Params[i]
+	}
+	return nil
+}