Make serde optional (#188)

argh/Cargo.toml

@@ -20,5 +20,6 @@ once_cell = "1.10.0"
 trybuild = "1.0.63"
 
 [features]
-default = ["help"]
+default = ["help", "serde"]
 help = ["argh_derive/help"]
+serde = ["argh_shared/serde"]

argh_shared/Cargo.toml

@@ -9,4 +9,4 @@ repository = "https://github.com/google/argh"
 readme = "README.md"
 
 [dependencies]
-serde = { version = "1", features = ["derive"] }
+serde = { version = "1", optional = true, features = ["derive"] }

argh_shared/src/lib.rs

@@ -15,7 +15,8 @@ pub struct CommandInfo<'a> {
 }
 
 /// Information about the command line arguments for a given command.
-#[derive(Debug, Default, PartialEq, Eq, Clone, serde::Serialize)]
+#[derive(Debug, Default, PartialEq, Eq, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub struct CommandInfoWithArgs<'a> {
     /// The name of the command.
     pub name: &'a str,
@@ -36,7 +37,8 @@ pub struct CommandInfoWithArgs<'a> {
 }
 
 /// Information about a documented error code.
-#[derive(Debug, PartialEq, Eq, serde::Serialize)]
+#[derive(Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub struct ErrorCodeInfo<'a> {
     /// The code value.
     pub code: i32,
@@ -45,7 +47,8 @@ pub struct ErrorCodeInfo<'a> {
 }
 
 /// Information about positional arguments
-#[derive(Debug, PartialEq, Eq, serde::Serialize)]
+#[derive(Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub struct PositionalInfo<'a> {
     /// Name of the argument.
     pub name: &'a str,
@@ -63,7 +66,8 @@ pub struct PositionalInfo<'a> {
 /// Dynamic subcommands do not implement
 /// get_args_info(), so the command field
 /// only contains the name and description.
-#[derive(Debug, Default, PartialEq, Eq, Clone, serde::Serialize)]
+#[derive(Debug, Default, PartialEq, Eq, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub struct SubCommandInfo<'a> {
     /// The subcommand name.
     pub name: &'a str,
@@ -72,7 +76,8 @@ pub struct SubCommandInfo<'a> {
 }
 
 /// Information about a flag or option.
-#[derive(Debug, Default, PartialEq, Eq, serde::Serialize)]
+#[derive(Debug, Default, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub struct FlagInfo<'a> {
     /// The kind of flag.
     pub kind: FlagInfoKind<'a>,
@@ -92,7 +97,8 @@ pub struct FlagInfo<'a> {
 }
 
 /// The kind of flags.
-#[derive(Debug, Default, PartialEq, Eq, serde::Serialize)]
+#[derive(Debug, Default, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub enum FlagInfoKind<'a> {
     /// switch represents a boolean flag,
     #[default]
@@ -104,7 +110,8 @@ pub enum FlagInfoKind<'a> {
 
 /// The optionality defines the requirements related
 /// to the presence of the argument on the command line.
-#[derive(Debug, Default, PartialEq, Eq, serde::Serialize)]
+#[derive(Debug, Default, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize))]
 pub enum Optionality {
     /// Required indicates the argument is required
     /// exactly once.