started working on help command

2 files changed, 31 insertions, 2 deletions

diff --git a/cmd/datamaps/main.go b/cmd/datamaps/main.go
index dc87f4f..66f78a0 100644
--- a/cmd/datamaps/main.go
+++ b/cmd/datamaps/main.go
@@ -12,12 +12,15 @@ import (
 )
 
 func main() {
+	opts := datamaps.ParseOptions()
+	if opts.Command == "help" {
+		os.Stdout.WriteString(datamaps.Usage)
+		os.Exit(0)
+	}
 	dbpc := datamaps.NewDBPathChecker(os.UserConfigDir)
 	if !dbpc.Check() {
 		datamaps.SetUp()
 	}
-	opts := datamaps.ParseOptions()
-
 	switch opts.Command {
 	case "import":
 		if err := datamaps.ImportToDB(opts); err != nil {
diff --git a/pkg/datamaps/config.go b/pkg/datamaps/config.go
index b21da5c..ec6f91e 100644
--- a/pkg/datamaps/config.go
+++ b/pkg/datamaps/config.go
@@ -11,6 +11,27 @@ const (
 	dbName        = "datamaps.db"
 )
 
+// Help text.
+const Usage = `
+usage: datamaps COMMAND [OPTIONS]
+
+-Managing datamap files-
+
+Command: datamap
+
+All datamap related actions. Before datamaps can do much, it must know about a datamap.
+A datamap starts life as a CSV file with the format:
+
+cell_key,template_sheet,cell_reference,type
+key1,sheet1,A10,TEXT
+key2,sheet1,A11,NUMBER
+...
+
+Options:
+	--import PATH		Import a datamap the csv datamap at PATH
+	--datamapname NAME	Name for imported datamap
+`
+
 // mocking funcs in go https://stackoverflow.com/questions/19167970/mock-functions-in-go
 // we only need the func signature to create the type. This is pretty weird, we're want to mock
 // os.UserHomeDir so that we can set it to something like /tmp in our tests. Here we are creating
@@ -194,9 +215,14 @@ func nextString(args []string, i *int, message string) string {
 }
 
 func processOptions(opts *Options, allArgs []string) {
+	if len(allArgs) == 0 {
+		allArgs = append(allArgs, "help")
+	}
 	switch allArgs[0] {
 	case "import":
 		opts.Command = "import"
+	case "help":
+		opts.Command = "help"
 	case "datamap":
 		opts.Command = "datamap"
 	case "setup":