add except method (#65)

cli/gnorm.toml

@@ -1,4 +1,6 @@
-# ConnStr is the connection string for the database.
+# ConnStr is the connection string for the database.  Any environment variables
+# in this string will be expanded, so for example dbname=$MY_DDB will do the
+# right thing.
 # MySQL example:
 # ConnStr = "root:admin@tcp/"
 # Postgres example:

cli/sample.go

@@ -24,7 +24,9 @@ package cli
 // 	fmt.Println("`")
 // }
 // gocog]]]
-const sample = `# ConnStr is the connection string for the database.
+const sample = `# ConnStr is the connection string for the database.  Any environment variables
+# in this string will be expanded, so for example dbname=$MY_DDB will do the
+# right thing.
 # MySQL example:
 # ConnStr = "root:admin@tcp/"
 # Postgres example:

run/data/data.go

@@ -154,6 +154,26 @@ func (s Strings) Sprintf(format string) Strings {
 	return ret
 }
 
+// Except returns a copy of the Strings with the given values removed.
+func (s Strings) Except(excludes []string) Strings {
+	ret := make(Strings, 0, len(s))
+	for x := range s {
+		if !contains(excludes, s[x]) {
+			ret = append(ret, s[x])
+		}
+	}
+	return ret
+}
+
+func contains(list []string, s string) bool {
+	for x := range list {
+		if s == list[x] {
+			return true
+		}
+	}
+	return false
+}
+
 // Columns represents the ordered list of columns in a table.
 type Columns []*Column
 

run/data/data_test.go

@@ -1,6 +1,9 @@
 package data
 
-import "testing"
+import (
+	"reflect"
+	"testing"
+)
 
 func TestStringsSprintf(t *testing.T) {
 	s := Strings{"one", "two", "three"}
@@ -14,3 +17,11 @@ func TestStringsSprintf(t *testing.T) {
 		}
 	}
 }
+
+func TestStringsExcept(t *testing.T) {
+	vals := Strings{"one", "two", "three", "four"}.Except([]string{"ONE", "two", "three"})
+	expected := Strings{"one", "four"}
+	if !reflect.DeepEqual(vals, expected) {
+		t.Fatalf("expected %q, but got %q", expected, vals)
+	}
+}

site/content/cli/configuration.md

@@ -35,7 +35,9 @@ func main() {
 }
 gocog}}} -->
 ```
-# ConnStr is the connection string for the database.
+# ConnStr is the connection string for the database.  Any environment variables
+# in this string will be expanded, so for example dbname=$MY_DDB will do the
+# right thing.
 # MySQL example:
 # ConnStr = "root:admin@tcp/"
 # Postgres example:

site/content/templates/data.md

@@ -148,6 +148,7 @@ Strings is a list of string values with the following methods
 | Method | Arguments | Description |
 | --- | ---- | --- |
 | Sprintf | format (string) | Sprintf calls [fmt.Sprintf](https://golang.org/pkg/fmt/#Sprintf)(format, str) for every string in this value and returns the results as a new Strings value.
+| Except | vals ([]string) | Except returns a Strings value with the given values removed from the list (if they existed).  The check is case sensitive.
 
 ### Table