Add new form for shell-specific variables and deprecate the old form

Cargo.toml

@@ -27,3 +27,7 @@ shellexpand = "2.1.0"
 human-panic = "1.0.3"
 log = "0.4.16"
 env_logger = "0.9.0"
+
+[dev-dependencies]
+indoc = "1.0.4"
+pretty_assertions = "1.2.1"

README.md

@@ -118,18 +118,26 @@ PATH = ["$PATH", "$BIN_HOME", "$CARGO_HOME/bin"]
 
 #### Shell Specific Environment Variables
 
-To set environment variables for only one shell, add a new table called `[shell.NAME]` after all standard definitions,
-where `NAME` is on of `bash`, `zsh`, or `fish`.
-Then list the environment variables that will only be added if `xshe` is being used for the given shell.
+To set environment variables for only one shell, add a `.NAME` prefix after the name of the environment variable,
+where `NAME` is one of `bash`, `zsh`, or `fish`.
+These environment variables will only be added if the given shell is used.
+
+As an example, these lines make `$HISTFILE` be set to different values between different shells,
+and to have `$ZSH_CACHE_DIR` only be set in **zsh**, do this:
 
-For example, to make `$HISTFILE` be different between shells and `$ZSH_CACHE_DIR` only be set in **zsh**, do this:
 ```toml
-[shell.bash]
-HISTFILE = "$XDG_STATE_HOME/bash_history"
+HISTFILE.bash = "$XDG_STATE_HOME/bash_history"
+HISTFILE.zsh = "$XDG_STATE_HOME/zsh_history"
+
+ZSH_CACHE_DIR.zsh = "$XDG_CACHE_HOME/oh-my-zsh"
+```
 
-[shell.zsh]
-HISTFILE = "$XDG_STATE_HOME/zsh_history"
-ZSH_CACHE_DIR = "$XDG_CACHE_HOME/oh-my-zsh"
+You can use `._` instead of using a shell name to specify a default if an option doesn't apply to any of the shells.
+For example, these lines set the `$EDITOR` to `nano` on **bash**, but [`micro`][micro] on everything else:
+
+```toml
+EDITOR.bash = "$(which nano)"
+EDITOR._ = "$(which micro)"
 ```
 
 ### Sourcing the `xshe.toml` file
@@ -272,6 +280,7 @@ additional terms or conditions.
 [Cargo]: https://doc.rust-lang.org/cargo/
 [install Cargo/Rust]: https://www.rust-lang.org/tools/install
 [toml]: https://toml.io/en/
+[micro]: https://micro-editor.github.io/
 
-[example]: https://gist.github.com/superatomic/8f22ada9864c85984d51e0cc6fae4250
+[example]: https://gist.github.com/superatomic/52a46e53a4afce75ede4db7ba6354e0a
 [path?]: https://askubuntu.com/questions/551990/what-does-path-mean

src/config_file.rs

@@ -18,15 +18,16 @@ use serde::Deserialize;
 use std::collections::HashMap;
 use std::string::String;
 
-pub(crate) type EnvironmentVariables = IndexMap<String, EnvValue>;
+pub(crate) type EnvironmentVariables = IndexMap<String, EnvVariableOption>;
 
 /// The TOML file to load environment variables from.
-#[derive(Deserialize, Debug)]
+#[derive(Deserialize, Debug, Clone, Eq, PartialEq)]
 pub(crate) struct ConfigFile {
     #[serde(flatten)]
     pub(crate) vars: EnvironmentVariables,
 
-    pub(crate) shell: Option<HashMap<String, EnvironmentVariables>>,
+    // Deprecated
+    pub(crate) shell: Option<HashMap<String, IndexMap<String, EnvVariableValue>>>,
 }
 
 impl ConfigFile {
@@ -35,10 +36,140 @@ impl ConfigFile {
     }
 }
 
+#[derive(Deserialize, Debug, Clone, Eq, PartialEq)]
+#[serde(untagged)]
+pub(crate) enum EnvVariableOption {
+    Specific(IndexMap<String, EnvVariableValue>),
+    General(EnvVariableValue),
+}
+
 /// Enum of possible environment variable value types.
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Deserialize, Debug, Clone, Eq, PartialEq)]
 #[serde(untagged)]
-pub(crate) enum EnvValue {
+pub(crate) enum EnvVariableValue {
     String(String),
     Array(Vec<String>),
 }
+
+#[cfg(test)]
+mod tests {
+    use indexmap::indexmap;
+    use indoc::indoc;
+    use pretty_assertions::assert_eq;
+
+    use super::*;
+    use EnvVariableOption::*;
+
+    /// A function to get a ConfigFile from a str more easily.
+    fn to_config(toml_str: &str) -> ConfigFile {
+        toml::from_str(toml_str).unwrap()
+    }
+
+    /// Used to compare TOML to its expected representation in all other tests.
+    fn assert_config_value(toml_str: &str, map: EnvironmentVariables) {
+        assert_eq!(to_config(toml_str).vars, map);
+    }
+
+    #[test]
+    fn test_config_file_load_string() {
+        assert_config_value(
+            indoc! {r#"
+                FOO = "Bar"
+            "#},
+            indexmap! {
+                "FOO".into() => General(EnvVariableValue::String("Bar".into())),
+            },
+        )
+    }
+
+    #[test]
+    fn test_config_file_load_path() {
+        assert_config_value(
+            indoc! {r#"
+                PATH = ["/usr/local/bin", "/usr/bin", "/bin", "/usr/sbin", "/sbin"]
+            "#},
+            indexmap! {
+                "PATH".into() => General(EnvVariableValue::Array(vec![
+                    "/usr/local/bin".into(),
+                    "/usr/bin".into(),
+                    "/bin".into(),
+                    "/usr/sbin".into(),
+                    "/sbin".into(),
+                ])),
+            },
+        )
+    }
+
+    #[test]
+    fn test_config_file_load_specific() {
+        assert_config_value(
+            indoc! {r#"
+                ONLY_FOR_BASH.bash = "Do people read test cases?"
+            "#},
+            indexmap! {
+                "ONLY_FOR_BASH".into() => Specific(indexmap! {
+                    "bash".into() => EnvVariableValue::String("Do people read test cases?".into()),
+                }),
+            },
+        )
+    }
+
+    #[test]
+    fn test_config_file_load_specific_other() {
+        assert_config_value(
+            indoc! {r#"
+                SOME_VARIABLE.fish = "you're pretty"
+                SOME_VARIABLE._ = '[ACCESS DENIED]'
+            "#},
+            indexmap! {
+                "SOME_VARIABLE".into() => Specific(indexmap! {
+                    "fish".into() => EnvVariableValue::String("you're pretty".into()),
+                    "_".into() => EnvVariableValue::String("[ACCESS DENIED]".into()),
+                })
+            },
+        )
+    }
+
+    #[test]
+    fn test_config_file_load_specific_other_alt() {
+        assert_config_value(
+            indoc! {r#"
+                [SOME_VARIABLE]
+                fish = "you're pretty"
+                _ = '[ACCESS DENIED]'
+
+                [ANOTHER_VARIABLE]
+                zsh = 'Zzz'
+            "#},
+            indexmap! {
+                "SOME_VARIABLE".into() => Specific(indexmap! {
+                    "fish".into() => EnvVariableValue::String("you're pretty".into()),
+                    "_".into() => EnvVariableValue::String("[ACCESS DENIED]".into()),
+                }),
+                "ANOTHER_VARIABLE".into() => Specific(indexmap! {
+                    "zsh".into() => EnvVariableValue::String("Zzz".into()),
+                }),
+            },
+        )
+    }
+
+    #[test]
+    fn test_config_file_everything() {
+        assert_config_value(
+            indoc! {r#"
+                FOO = 'bar'
+                BAZ.zsh = 'zž'
+                BAZ.fish = ['gone', 'fishing']
+                BAZ._ = 'other'
+            "#},
+            indexmap! {
+                "FOO".into() => General(EnvVariableValue::String("bar".into())),
+                "BAZ".into() => Specific(indexmap! {
+                    "zsh".into() => EnvVariableValue::String("zž".into()),
+                    "fish".into() => EnvVariableValue::Array(vec!["gone".into(), "fishing".into()]),
+                    "_".into() => EnvVariableValue::String("other".into()),
+                })
+            },
+        )
+    }
+}