From c7abb31b7cfaaff3f64b5147ff7a3f38bdfb53ed Mon Sep 17 00:00:00 2001
From: Jonathan Turner <jonathan.d.turner@gmail.com>
Date: Tue, 16 Jul 2019 19:25:48 +1200
Subject: [PATCH] Fix inc plugin

---
 src/parser/registry.rs | 8 ++++++++
 src/plugins/inc.rs     | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/parser/registry.rs b/src/parser/registry.rs
index 7a15071cb..2e910ae96 100644
--- a/src/parser/registry.rs
+++ b/src/parser/registry.rs
@@ -32,6 +32,14 @@ impl PositionalType {
         PositionalType::Mandatory(name.to_string(), SyntaxType::Any)
     }
 
+    pub fn optional(name: &str, ty: SyntaxType) -> PositionalType {
+        PositionalType::Optional(name.to_string(), ty)
+    }
+
+    pub fn optional_any(name: &str) -> PositionalType {
+        PositionalType::Optional(name.to_string(), SyntaxType::Any)
+    }
+
     pub fn mandatory_block(name: &str) -> PositionalType {
         PositionalType::Mandatory(name.to_string(), SyntaxType::Block)
     }
diff --git a/src/plugins/inc.rs b/src/plugins/inc.rs
index 0e41d585b..faf5ccc2b 100644
--- a/src/plugins/inc.rs
+++ b/src/plugins/inc.rs
@@ -17,7 +17,7 @@ impl Plugin for Inc {
     fn config(&mut self) -> Result<CommandConfig, ShellError> {
         Ok(CommandConfig {
             name: "inc".to_string(),
-            positional: vec![PositionalType::mandatory_any("Increment")],
+            positional: vec![PositionalType::optional_any("Increment")],
             is_filter: true,
             is_sink: false,
             named: IndexMap::new(),