Added glob patterns to the syntax shapes

Bare words now represent literal file names, and globs are a different
syntax shape called "Pattern". This allows commands like `cp` to ask for
a pattern as a source and a literal file as a target.

This also means that attempting to pass a glob to a command that expects
a literal path will produce an error.

src/commands/cp.rs

@@ -21,7 +21,7 @@ impl PerItemCommand for Cpy {
 
     fn signature(&self) -> Signature {
         Signature::build("cp")
-            .required("src", SyntaxType::Path)
+            .required("src", SyntaxType::Pattern)
             .required("dst", SyntaxType::Path)
             .named("file", SyntaxType::Any)
             .switch("recursive")

src/commands/to_bson.rs

@@ -50,6 +50,7 @@ pub fn value_to_bson_value(v: &Tagged<Value>) -> Result<Bson, ShellError> {
         }
         Value::Primitive(Primitive::Nothing) => Bson::Null,
         Value::Primitive(Primitive::String(s)) => Bson::String(s.clone()),
+        Value::Primitive(Primitive::Pattern(p)) => Bson::String(p.clone()),
         Value::Primitive(Primitive::Path(s)) => Bson::String(s.display().to_string()),
         Value::Table(l) => Bson::Array(
             l.iter()

src/commands/to_json.rs

@@ -45,6 +45,7 @@ pub fn value_to_json_value(v: &Tagged<Value>) -> Result<serde_json::Value, Shell
             CoerceInto::<i64>::coerce_into(i.tagged(v.tag), "converting to JSON number")?,
         )),
         Value::Primitive(Primitive::Nothing) => serde_json::Value::Null,
+        Value::Primitive(Primitive::Pattern(s)) => serde_json::Value::String(s.clone()),
         Value::Primitive(Primitive::String(s)) => serde_json::Value::String(s.clone()),
         Value::Primitive(Primitive::Path(s)) => serde_json::Value::String(s.display().to_string()),
 

src/commands/to_sqlite.rs

@@ -91,6 +91,7 @@ fn nu_value_to_sqlite_string(v: Value) -> String {
             Primitive::Int(i) => format!("{}", i),
             Primitive::Decimal(f) => format!("{}", f),
             Primitive::Bytes(u) => format!("{}", u),
+            Primitive::Pattern(s) => format!("'{}'", s.replace("'", "''")),
             Primitive::String(s) => format!("'{}'", s.replace("'", "''")),
             Primitive::Boolean(true) => "1".into(),
             Primitive::Boolean(_) => "0".into(),

src/commands/to_toml.rs

@@ -44,6 +44,7 @@ pub fn value_to_toml_value(v: &Tagged<Value>) -> Result<toml::Value, ShellError>
             toml::Value::Integer(i.tagged(v.tag).coerce_into("converting to TOML integer")?)
         }
         Value::Primitive(Primitive::Nothing) => toml::Value::String("<Nothing>".to_string()),
+        Value::Primitive(Primitive::Pattern(s)) => toml::Value::String(s.clone()),
         Value::Primitive(Primitive::String(s)) => toml::Value::String(s.clone()),
         Value::Primitive(Primitive::Path(s)) => toml::Value::String(s.display().to_string()),
 

src/commands/to_yaml.rs

@@ -42,6 +42,7 @@ pub fn value_to_yaml_value(v: &Tagged<Value>) -> Result<serde_yaml::Value, Shell
             CoerceInto::<i64>::coerce_into(i.tagged(v.tag), "converting to YAML number")?,
         )),
         Value::Primitive(Primitive::Nothing) => serde_yaml::Value::Null,
+        Value::Primitive(Primitive::Pattern(s)) => serde_yaml::Value::String(s.clone()),
         Value::Primitive(Primitive::String(s)) => serde_yaml::Value::String(s.clone()),
         Value::Primitive(Primitive::Path(s)) => serde_yaml::Value::String(s.display().to_string()),