1 files changed, 61 insertions, 0 deletions
diff --git a/run.go b/run.go
new file mode 100644
index 0000000..d0c9a57
--- /dev/null
+++ b/run.go
@@ -0,0 +1,61 @@
+package complete
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+const (
+	envComplete = "COMP_LINE"
+	envDebug    = "COMP_DEBUG"
+)
+
+// Run get a command, get the typed arguments from environment
+// variable, and print out the complete options
+func Run(c Command) {
+	args := getLine()
+	Log("Completing args: %s", args)
+
+	options := complete(c, args)
+
+	Log("Completion: %s", options)
+	output(options)
+}
+
+// complete get a command an command line arguments and returns
+// matching completion options
+func complete(c Command, args []string) (matching []string) {
+	options, _ := c.options(args[:len(args)-1])
+
+	// choose only matching options
+	l := last(args)
+	for _, option := range options {
+		if option.Matches(l) {
+			matching = append(matching, option.String())
+		}
+	}
+	return
+}
+
+func getLine() []string {
+	line := os.Getenv(envComplete)
+	if line == "" {
+		panic("should be run as a complete script")
+	}
+	return strings.Split(line, " ")
+}
+
+func last(args []string) (last string) {
+	if len(args) > 0 {
+		last = args[len(args)-1]
+	}
+	return
+}
+
+func output(options []string) {
+	// stdout of program defines the complete options
+	for _, option := range options {
+		fmt.Println(option)
+	}
+}