config: Make YAML/JSON modular and optional (#21)

Cargo.toml

@@ -8,12 +8,15 @@ edition = "2018"
 lto = "fat"
 
 [features]
-default = ["alsa-widget", "pulseaudio-widget"]
+default = ["alsa-widget", "pulseaudio-widget", "yaml-cfg", "json-cfg"]
 damage_debug = []
+
+yaml-cfg = ["serde_yaml"]
+json-cfg = ["serde_json"]
+
 alsa-widget = ["alsa"]
 pulseaudio-widget = ["libpulse-binding"]
 
-
 [dependencies]
 smithay-client-toolkit = "0.6.4"
 byteorder = "1.3"
@@ -30,9 +33,10 @@ lazy_static = "1.4"
 rcalc_lib = { version = "0.9" }
 rust-ini = "0.13"
 shlex = "0.1"
-serde_json = "1.0"
-serde_yaml = "0.8"
+
 serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0", optional = true }
+serde_yaml = { version = "0.8", optional = true }
 
 libpulse-binding = { version = "2.11", optional = true }
 alsa = { version = "0.3.0", optional = true }