feat(config): allow printing default and computed config (#2521)

* feat: allow printing default and computed config

* fix custom modules

* actually fix custom modules

61 files changed, 246 insertions, 139 deletions

diff --git a/src/config.rs b/src/config.rs
index f8a0a3a13..0e6a35df5 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -2,6 +2,7 @@ use crate::configs::StarshipRootConfig;
 use crate::utils;
 use ansi_term::{Color, Style};
 use indexmap::IndexMap;
+use serde::Serialize;
 
 use std::clone::Clone;
 use std::collections::HashMap;
@@ -174,7 +175,7 @@ where
 
 /// A wrapper around `Vec<T>` that implements `ModuleConfig`, and either
 /// accepts a value of type `T` or a list of values of type `T`.
-#[derive(Clone, Default)]
+#[derive(Clone, Default, Serialize)]
 pub struct VecOr<T>(pub Vec<T>);
 
 impl<'a, T> ModuleConfig<'a> for VecOr<T>
@@ -479,7 +480,7 @@ mod tests {
 
     #[test]
     fn test_load_config() {
-        #[derive(Clone, ModuleConfig)]
+        #[derive(Clone, Default, ModuleConfig)]
         struct TestConfig<'a> {
             pub symbol: &'a str,
             pub disabled: bool,
@@ -505,13 +506,13 @@ mod tests {
 
     #[test]
     fn test_load_nested_config() {
-        #[derive(Clone, ModuleConfig)]
+        #[derive(Clone, Default, ModuleConfig)]
         struct TestConfig<'a> {
             pub untracked: SegmentDisplayConfig<'a>,
             pub modified: SegmentDisplayConfig<'a>,
         }
 
-        #[derive(PartialEq, Debug, Clone, ModuleConfig)]
+        #[derive(PartialEq, Debug, Clone, Default, ModuleConfig)]
         struct SegmentDisplayConfig<'a> {
             pub value: &'a str,
             pub style: Style,
@@ -552,7 +553,7 @@ mod tests {
 
     #[test]
     fn test_load_optional_config() {
-        #[derive(Clone, ModuleConfig)]
+        #[derive(Clone, Default, ModuleConfig)]
         struct TestConfig<'a> {
             pub optional: Option<&'a str>,
             pub hidden: Option<&'a str>,
@@ -573,7 +574,7 @@ mod tests {
 
     #[test]
     fn test_load_enum_config() {
-        #[derive(Clone, ModuleConfig)]
+        #[derive(Clone, Default, ModuleConfig)]
         struct TestConfig {
             pub switch_a: Switch,
             pub switch_b: Switch,
@@ -586,6 +587,12 @@ mod tests {
             Off,
         }
 
+        impl Default for Switch {
+            fn default() -> Self {
+                Self::Off
+            }
+        }
+
         impl<'a> ModuleConfig<'a> for Switch {
             fn from_config(config: &'a Value) -> Option<Self> {
                 match config.as_str()? {
diff --git a/src/configs/aws.rs b/src/configs/aws.rs
index adc3868e8..8cef66362 100644
--- a/src/configs/aws.rs
+++ b/src/configs/aws.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 use std::collections::HashMap;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct AwsConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/battery.rs b/src/configs/battery.rs
index 578fc040b..db313daa7 100644
--- a/src/configs/battery.rs
+++ b/src/configs/battery.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct BatteryConfig<'a> {
     pub full_symbol: &'a str,
     pub charging_symbol: &'a str,
@@ -32,7 +33,7 @@ impl<'a> Default for BatteryConfig<'a> {
     }
 }
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Default, Serialize)]
 pub struct BatteryDisplayConfig<'a> {
     pub threshold: i64,
     pub style: &'a str,
diff --git a/src/configs/character.rs b/src/configs/character.rs
index 3e7153370..19204fe3c 100644
--- a/src/configs/character.rs
+++ b/src/configs/character.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct CharacterConfig<'a> {
     pub format: &'a str,
     pub success_symbol: &'a str,
diff --git a/src/configs/cmake.rs b/src/configs/cmake.rs
index 8b9f51c85..d225b0d90 100644
--- a/src/configs/cmake.rs
+++ b/src/configs/cmake.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct CMakeConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/cmd_duration.rs b/src/configs/cmd_duration.rs
index 096fbf8e1..be5d2f732 100644
--- a/src/configs/cmd_duration.rs
+++ b/src/configs/cmd_duration.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct CmdDurationConfig<'a> {
     pub min_time: i64,
     pub format: &'a str,
diff --git a/src/configs/conda.rs b/src/configs/conda.rs
index 54e9434ef..623b4fc67 100644
--- a/src/configs/conda.rs
+++ b/src/configs/conda.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct CondaConfig<'a> {
     pub truncation_length: usize,
     pub format: &'a str,
diff --git a/src/configs/crystal.rs b/src/configs/crystal.rs
index ae3c4da75..e5b61476e 100644
--- a/src/configs/crystal.rs
+++ b/src/configs/crystal.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct CrystalConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/custom.rs b/src/configs/custom.rs
index df6d03de5..bced89319 100644
--- a/src/configs/custom.rs
+++ b/src/configs/custom.rs
@@ -1,29 +1,22 @@
 use crate::config::{ModuleConfig, VecOr};
 
+use serde::{self, Serialize};
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, Default, PartialEq)]
-pub struct Files<'a>(pub Vec<&'a str>);
-
-#[derive(Clone, Default, PartialEq)]
-pub struct Extensions<'a>(pub Vec<&'a str>);
-
-#[derive(Clone, Default, PartialEq)]
-pub struct Directories<'a>(pub Vec<&'a str>);
-
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct CustomConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
     pub command: &'a str,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub when: Option<&'a str>,
     pub shell: VecOr<&'a str>,
     pub description: &'a str,
     pub style: &'a str,
     pub disabled: bool,
-    pub files: Files<'a>,
-    pub extensions: Extensions<'a>,
-    pub directories: Directories<'a>,
+    pub files: Vec<&'a str>,
+    pub extensions: Vec<&'a str>,
+    pub directories: Vec<&'a str>,
 }
 
 impl<'a> Default for CustomConfig<'a> {
@@ -37,57 +30,9 @@ impl<'a> Default for CustomConfig<'a> {
             description: "<custom config>",
             style: "green bold",
             disabled: false,
-            files: Files::default(),
-            extensions: Extensions::default(),
-            directories: Directories::default(),
+            files: Vec::default(),
+            extensions: Vec::default(),
+            directories: Vec::default(),
         }
     }
 }
-
-impl<'a> ModuleConfig<'a> for Files<'a> {
-    fn from_config(config: &'a toml::Value) -> Option<Self> {
-        let mut files = Vec::new();
-
-        for item in config.as_array()? {
-            if let Some(file) = item.as_str() {
-                files.push(file);
-            } else {
-                log::warn!("Unexpected file {:?}", item);
-            }
-        }
-
-        Some(Files(files))
-    }
-}
-
-impl<'a> ModuleConfig<'a> for Extensions<'a> {
-    fn from_config(config: &'a toml::Value) -> Option<Self> {
-        let mut extensions = Vec::new();
-
-        for item in config.as_array()? {
-            if let Some(file) = item.as_str() {
-                extensions.push(file);
-            } else {
-                log::warn!("Unexpected extension {:?}", item);
-            }
-        }
-
-        Some(Extensions(extensions))
-    }
-}
-
-impl<'a> ModuleConfig<'a> for Directories<'a> {
-    fn from_config(config: &'a toml::Value) -> Option<Self> {
-        let mut directories = Vec::new();
-
-        for item in config.as_array()? {
-            if let Some(file) = item.as_str() {
-                directories.push(file);
-            } else {
-                log::warn!("Unexpected directory {:?}", item);
-            }
-        }
-
-        Some(Directories(directories))
-    }
-}
diff --git a/src/configs/dart.rs b/src/configs/dart.rs
index ef8e16bba..94f5112e4 100644
--- a/src/configs/dart.rs
+++ b/src/configs/dart.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct DartConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/directory.rs b/src/configs/directory.rs
index 47fa8bdcf..9f1b27ad4 100644
--- a/src/configs/directory.rs
+++ b/src/configs/directory.rs
@@ -1,9 +1,10 @@
 use crate::config::ModuleConfig;
 use indexmap::IndexMap;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct DirectoryConfig<'a> {
     pub truncation_length: i64,
     pub truncate_to_repo: bool,
diff --git a/src/configs/docker_context.rs b/src/configs/docker_context.rs
index 7d8757d4d..b026acda9 100644
--- a/src/configs/docker_context.rs
+++ b/src/configs/docker_context.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct DockerContextConfig<'a> {
     pub symbol: &'a str,
     pub style: &'a str,
diff --git a/src/configs/dotnet.rs b/src/configs/dotnet.rs
index 33118e7c9..05438f363 100644
--- a/src/configs/dotnet.rs
+++ b/src/configs/dotnet.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct DotnetConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/elixir.rs b/src/configs/elixir.rs
index 3fddbb979..9eb5b347c 100644
--- a/src/configs/elixir.rs
+++ b/src/configs/elixir.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct ElixirConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/elm.rs b/src/configs/elm.rs
index 4b582867b..d97cddd9c 100644
--- a/src/configs/elm.rs
+++ b/src/configs/elm.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct ElmConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/env_var.rs b/src/configs/env_var.rs
index 07aef6090..30ab72e95 100644
--- a/src/configs/env_var.rs
+++ b/src/configs/env_var.rs
@@ -1,12 +1,15 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct EnvVarConfig<'a> {
     pub symbol: &'a str,
     pub style: &'a str,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub variable: Option<&'a str>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub default: Option<&'a str>,
     pub format: &'a str,
     pub disabled: bool,
diff --git a/src/configs/erlang.rs b/src/configs/erlang.rs
index 9e04105df..b0a7515ef 100644
--- a/src/configs/erlang.rs
+++ b/src/configs/erlang.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct ErlangConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/gcloud.rs b/src/configs/gcloud.rs
index d3f3c2028..fd291badf 100644
--- a/src/configs/gcloud.rs
+++ b/src/configs/gcloud.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 use std::collections::HashMap;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct GcloudConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/git_branch.rs b/src/configs/git_branch.rs
index 87ab33f1a..d9c40c9ad 100644
--- a/src/configs/git_branch.rs
+++ b/src/configs/git_branch.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct GitBranchConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/git_commit.rs b/src/configs/git_commit.rs
index d07a9d765..01c4c3ee3 100644
--- a/src/configs/git_commit.rs
+++ b/src/configs/git_commit.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct GitCommitConfig<'a> {
     pub commit_hash_length: usize,
     pub format: &'a str,
diff --git a/src/configs/git_state.rs b/src/configs/git_state.rs
index 5bc214dd4..d0773dcdd 100644
--- a/src/configs/git_state.rs
+++ b/src/configs/git_state.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct GitStateConfig<'a> {
     pub rebase: &'a str,
     pub merge: &'a str,
diff --git a/src/configs/git_status.rs b/src/configs/git_status.rs
index e2b2f8f78..9def0ca58 100644
--- a/src/configs/git_status.rs
+++ b/src/configs/git_status.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct GitStatusConfig<'a> {
     pub format: &'a str,
     pub style: &'a str,
diff --git a/src/configs/go.rs b/src/configs/go.rs
index 9db7f28f7..c4fb3dca5 100644
--- a/src/configs/go.rs
+++ b/src/configs/go.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct GoConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/helm.rs b/src/configs/helm.rs
index dfa2b46be..a99ad7aba 100644
--- a/src/configs/helm.rs
+++ b/src/configs/helm.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct HelmConfig<'a> {
     pub format: &'a str,
     pub symbol: &'a str,
diff --git a/src/configs/hg_branch.rs b/src/configs/hg_branch.rs
index c06f9a1d0..cb50afc52 100644
--- a/src/configs/hg_branch.rs
+++ b/src/configs/hg_branch.rs
@@ -1,8 +1,9 @@
 use crate::config::ModuleConfig;
 
+use serde::Serialize;
 use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig)]
+#[derive(Clone, ModuleConfig, Serialize)]
 pub struct HgBranchConfig<'a> {
     pub symbol: &'a str,
     pub style: &'a str,
diff --git a/src/configs/hostname.rs b/src/configs/hostname.rs
index f1e91bea0..074fabcaf 100644
--- a/src/configs/hostname.rs
+++ b/src/configs/hostname.rs