feat: add Filters

1 files changed, 46 insertions, 0 deletions

diff --git a/cmd/filters.go b/cmd/filters.go
new file mode 100644
index 0000000..28592ba
--- /dev/null
+++ b/cmd/filters.go
@@ -0,0 +1,46 @@
+package cmd
+
+import (
+	"strings"
+)
+
+var filterList = map[string]interface{}{
+	"uppercase":       NewUppercaseFilter,
+	"lowercase":       NewLowercaseFilter,
+	"lowercase_extra": NewLowercaseFilterWithExtraSteps,
+}
+
+func NewUppercaseFilter() Filter {
+	uppercaseFilter := Filter{
+		name:       "Uppercase",
+		action:     strings.ToUpper,
+		subfilters: []Filter{},
+	}
+
+	return uppercaseFilter
+}
+
+func NewLowercaseFilter() Filter {
+	lowercaseFilter := Filter{
+		name:       "Lowercase",
+		action:     strings.ToLower,
+		subfilters: []Filter{},
+	}
+
+	return lowercaseFilter
+}
+
+func NewLowercaseFilterWithExtraSteps() Filter {
+	var subfilters []Filter
+
+	subfilters = append(subfilters, NewUppercaseFilter())
+	subfilters = append(subfilters, NewLowercaseFilter())
+
+	filter := Filter{
+		name:       "Lowercase (extra dumb)",
+		action:     func(string) string { return "" },
+		subfilters: subfilters,
+	}
+
+	return filter
+}