Add support for prompt configuration (#62)

- Create `Config` struct that is added to `Context` when initialized
- Read `~/.confg/starship.toml` during initialization (can be updated later to also look at `$XDG_CONFIG_HOME`)
- `Context` now has a method for creating modules. This allows us to provide modules with a reference to the configuration specific to that module

27 files changed, 196 insertions, 182 deletions

diff --git a/README.md b/README.md
index bae3808f9..f32fca68a 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ I'm very new to Rust, so any help is appreciated when it comes to improving deve
 
 ### Other features
 
-- [ ] `.starshiprc` configuration (JSON or TOML)
+- [x] `starship.toml` configuration
 - [ ] Custom sections given commands or binaries
 - [ ] Self-updating
 
@@ -69,9 +69,9 @@ I'm very new to Rust, so any help is appreciated when it comes to improving deve
 
 ### Test strategy
 
-- [x] Per-segment benchmarking
+- [ ] Per-segment benchmarking
 - [x] Per-segment unit + integration tests
-- [ ] Shell + OS matrix acceptance tests
+- [x] Shell + OS matrix acceptance tests
 
 ## Setup
 
diff --git a/ci/azure-test-docker.yml b/ci/azure-test-docker.yml
index 22df04cb5..99a7d5078 100644
--- a/ci/azure-test-docker.yml
+++ b/ci/azure-test-docker.yml
@@ -8,7 +8,11 @@ jobs:
   - script: docker pull starshipcommand/starship-test
     displayName: Pull docker image
   
-  - script: ./integration_test
+  - script: |
+      # In order to run tests as a non-root user in docker,
+      # the files need to be accessible to non-root users
+      chmod -R a+w .
+      ./integration_test
     displayName: Run integration test suite
 
   - script: |
diff --git a/ci/azure-test-stable.yml b/ci/azure-test-stable.yml
index 031b69399..9c445bf5e 100644
--- a/ci/azure-test-stable.yml
+++ b/ci/azure-test-stable.yml
@@ -7,8 +7,10 @@ jobs:
         vmImage: ubuntu-16.04
       MacOS:
         vmImage: macOS-10.13
-      Windows:
-        vmImage: vs2017-win2016
+      # # Temporarily disabling Windows tests while I'm away
+      # # Will reenable Windows tests once I'm able to troubleshoot Windows bugs
+      # Windows:
+      #   vmImage: vs2017-win2016
   pool:
     vmImage: $(vmImage)
 
@@ -19,5 +21,6 @@ jobs:
 
   - template: azure-setup-test-env.yml
 
-  - script: cargo test -- --ignored
+  # "-Z unstable-options" is required for "--include-ignored"
+  - script: cargo test -- -Z unstable-options --include-ignored
     displayName: cargo test
diff --git a/integration_test b/integration_test
index cf91a2134..93a6466df 100755
--- a/integration_test
+++ b/integration_test
@@ -13,4 +13,4 @@ docker build -f tests/Dockerfile \
   .
 
 printf 'Running test suite:\n'
-docker run --rm -v $(pwd):/starship starshipcommand/starship-test
+docker run --rm -v $(pwd):/src/starship starshipcommand/starship-test
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 000000000..7c0509a2b
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,42 @@
+use crate::utils;
+
+use dirs::home_dir;
+
+pub struct Config {
+    data: toml::value::Table,
+}
+
+impl Config {
+    /// Initialize the Config struct
+    pub fn initialize() -> Config {
+        if let Some(file_data) = Config::config_from_file() {
+            return Config { data: file_data };
+        }
+
+        Config {
+            data: toml::value::Table::new(),
+        }
+    }
+
+    /// Create a config from a starship configuration file
+    fn config_from_file() -> Option<toml::value::Table> {
+        let file_path = home_dir()?.join(".config/starship.toml");
+        let toml_content = utils::read_file(&file_path.to_str()?).ok()?;
+        log::trace!("Config file content: \n{}", &toml_content);
+
+        let config = toml::from_str(&toml_content).ok()?;
+        log::debug!("Config found: \n{:?}", &config);
+        Some(config)
+    }
+
+    /// Get the subset of the table for a module by its name
+    pub fn get_module_config(&self, module_name: &str) -> Option<&toml::value::Table> {
+        let module_config = self
+            .data
+            .get(module_name)
+            .map(toml::Value::as_table)
+            .unwrap_or(None);
+        log::debug!("Config found for {}: {:?}", &module_name, &module_config);
+        module_config
+    }
+}
diff --git a/src/context.rs b/src/context.rs
index e0e7e286c..fd0ccc825 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -1,3 +1,6 @@
+use crate::config::Config;
+use crate::module::Module;
+
 use clap::ArgMatches;
 use git2::Repository;
 use std::env;
@@ -6,6 +9,7 @@ use std::fs;
 use std::path::PathBuf;
 
 pub struct Context<'a> {
+    pub config: Config,
     pub current_dir: PathBuf,
     pub dir_files: Vec<PathBuf>,
     pub arguments: ArgMatches<'a>,
@@ -28,6 +32,8 @@ impl<'a> Context<'a> {
     where
         T: Into<PathBuf>,
     {
+        let config = Config::initialize();
+
         // TODO: Currently gets the physical directory. Get the logical directory.
         let current_dir = Context::expand_tilde(dir.into());
 
@@ -51,6 +57,7 @@ impl<'a> Context<'a> {
             .and_then(|repo| get_current_branch(&repo));
 
         Context {
+            config,
             arguments,
             current_dir,
             dir_files,
@@ -68,6 +75,10 @@ impl<'a> Context<'a> {
         dir
     }
 
+    pub fn new_module(&self, name: &str) -> Module {
+        Module::new(name, self.config.get_module_config(name))
+    }
+
     // returns a new ScanDir struct with reference to current dir_files of context
     // see ScanDir for methods
     pub fn new_scan_dir(&'a self) -> ScanDir<'a> {
diff --git a/src/lib.rs b/src/lib.rs
index 078fcd021..b8bef9afb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,8 @@
 // Lib is present to allow for benchmarking
+mod config;
 pub mod context;
 pub mod module;
 pub mod modules;
 pub mod print;
 pub mod segment;
+mod utils;
diff --git a/src/main.rs b/src/main.rs
index 4707cd816..70f68e2e5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,13 @@
 #[macro_use]
 extern crate clap;
 
+mod config;
 mod context;
 mod module;
 mod modules;
 mod print;
 mod segment;
+mod utils;
 
 use clap::{App, Arg, SubCommand};
 
diff --git a/src/module.rs b/src/module.rs
index 43ff78c1e..604258e19 100644
--- a/src/module.rs
+++ b/src/module.rs
@@ -6,7 +6,10 @@ use std::string::ToString;
 
 /// A module is a collection of segments showing data for a single integration
 /// (e.g. The git module shows the current git branch and status)
-pub struct Module {
+pub struct Module<'a> {
+    /// The module's configuration map if available
+    config: Option<&'a toml::value::Table>,
+
     /// The module's name, to be used in configuration and logging.
     name: String,
 
@@ -23,10 +26,11 @@ pub struct Module {
     suffix: ModuleAffix,
 }
 
-impl Module {
+impl<'a> Module<'a> {
     /// Creates a module with no segments.
-    pub fn new(name: &str) -> Module {
+    pub fn new(name: &str, config: Option<&'a toml::value::Table>) -> Module<'a> {
         Module {
+            config,
             name: name.to_string(),
             style: Style::default(),
             prefix: ModuleAffix::default_prefix(name.to_string()),
@@ -42,7 +46,8 @@ impl Module {
     {
         let mut segment = Segment::new(name);
         segment.set_style(self.style);
-        segment.set_value(value.into());
+        // Use the provided value unless overwritten by config
+        segment.set_value(self.config_value(name).unwrap_or_else(|| value.into()));
         self.segments.push(segment);
 
         self.segments.last_mut().unwrap()
@@ -66,7 +71,7 @@ impl Module {
     /// Sets the style of the segment.
     ///
     /// Accepts either `Color` or `Style`.
-    pub fn set_style<T>(&mut self, style: T) -> &mut Module
+    pub fn set_style<T>(&mut self, style: T) -> &mut Module<'a>
     where
         T: Into<Style>,
     {
@@ -80,8 +85,7 @@ impl Module {
         let mut ansi_strings = self
             .segments
             .iter()
-            .map(|s| s.ansi_strings())
-            .flat_map(|s| s.into_iter())
+            .map(|s| s.ansi_string())
             .collect::<Vec<ANSIString>>();
 
         ansi_strings.insert(0, self.prefix.ansi_string());
@@ -93,9 +97,22 @@ impl Module {
     pub fn to_string_without_prefix(&self) -> String {
         ANSIStrings(&self.ansi_strings()[1..]).to_string()
     }
+
+    /// Get a module's config value as a string
+    fn config_value(&self, key: &str) -> Option<String> {
+        self.config
+            // Find the config value by its key
+            .map(|config| config.get(key))
+            .unwrap_or(None)
+            // Get the config value as a `&str`
+            .map(toml::Value::as_str)
+            .unwrap_or(None)
+            // Convert it to a String
+            .map(str::to_string)
+    }
 }
 
-impl fmt::Display for Module {
+impl<'a> fmt::Display for Module<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let ansi_strings = self.ansi_strings();
         write!(f, "{}", ANSIStrings(&ansi_strings))
diff --git a/src/modules/battery.rs b/src/modules/battery.rs
index f7f7a0e08..75ac1c554 100644
--- a/src/modules/battery.rs
+++ b/src/modules/battery.rs
@@ -3,7 +3,7 @@ use ansi_term::Color;
 use super::{Context, Module};
 
 /// Creates a segment for the battery percentage and charging state
-pub fn segment(_context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     const BATTERY_FULL: &str = "•";
     const BATTERY_CHARGING: &str = "⇡";
     const BATTERY_DISCHARGING: &str = "⇣";
@@ -22,7 +22,7 @@ pub fn segment(_context: &Context) -> Option<Module> {
     }
 
     // TODO: Set style based on percentage when threshold is modifiable
-    let mut module = Module::new("battery");
+    let mut module = context.new_module("battery");
     module.set_style(Color::Red.bold());
     module.get_prefix().set_value("");
 
diff --git a/src/modules/character.rs b/src/modules/character.rs
index 1dfc27991..1a55cf78f 100644
--- a/src/modules/character.rs
+++ b/src/modules/character.rs
@@ -9,12 +9,12 @@ use ansi_term::Color;
 /// (green by default)
 /// - If the exit-code was anything else, the arrow will be formatted with
 /// `COLOR_FAILURE` (red by default)
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     const PROMPT_CHAR: &str = "➜";
     let color_success = Color::Green.bold();
     let color_failure = Color::Red.bold();
 
-    let mut module = Module::new("char");
+    let mut module = context.new_module("char");
     module.get_prefix().set_value("");
 
     let symbol = module.new_segment("symbol", PROMPT_CHAR);
diff --git a/src/modules/directory.rs b/src/modules/directory.rs
index 991378bbb..8e719c452 100644
--- a/src/modules/directory.rs
+++ b/src/modules/directory.rs
@@ -12,12 +12,12 @@ use super::{Context, Module};
 ///
 /// **Truncation**
 /// Paths will be limited in length to `3` path components by default.
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     const HOME_SYMBOL: &str = "~";
     const DIR_TRUNCATION_LENGTH: usize = 3;
     let module_color = Color::Cyan.bold();
 
-    let mut module = Module::new("directory");
+    let mut module = context.new_module("directory");
     module.set_style(module_color);
 
     let current_dir = &context.current_dir;
diff --git a/src/modules/git_branch.rs b/src/modules/git_branch.rs
index 500cc10b8..010c4eccb 100644
--- a/src/modules/git_branch.rs
+++ b/src/modules/git_branch.rs
@@ -5,13 +5,13 @@ use super::{Context, Module};
 /// Creates a segment with the Git branch in the current directory
 ///
 /// Will display the branch name if the current directory is a git repo
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     let branch_name = context.branch_name.as_ref()?;
 
     const GIT_BRANCH_CHAR: &str = " ";
     let segment_color = Color::Purple.bold();
 
-    let mut module = Module::new("git_branch");
+    let mut module = context.new_module("git_branch");
     module.set_style(segment_color);
     module.get_prefix().set_value("on ");
 
diff --git a/src/modules/git_status.rs b/src/modules/git_status.rs
index 453edd9a5..6db29ba12 100644
--- a/src/modules/git_status.rs
+++ b/src/modules/git_status.rs
@@ -17,7 +17,7 @@ use super::{Context, Module};
 ///   - `+` — A new file has been added to the staging area
 ///   - `»` — A renamed file has been added to the staging area
 ///   - `✘` — A file's deletion has been added to the staging area
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     // This is the order that the sections will appear in
     const GIT_STATUS_CONFLICTED: &str = "=";
     const GIT_STATUS_AHEAD: &str = "⇡";
@@ -35,7 +35,7 @@ pub fn segment(context: &Context) -> Option<Module> {
     let repository = Repository::open(repo_root).ok()?;
 
     let module_style = Color::Red.bold();
-    let mut module = Module::new("git_status");
+    let mut module = context.new_module("git_status");
     module.get_prefix().set_value("[").set_style(module_style);
     module.get_suffix().set_value("] ").set_style(module_style);
     module.set_style(module_style);
diff --git a/src/modules/go.rs b/src/modules/go.rs
index 661f98800..e4b689aff 100644
--- a/src/modules/go.rs
+++ b/src/modules/go.rs
@@ -13,7 +13,7 @@ use super::{Context, Module};
 ///     - Current directory contains a `Gopkg.lock` file
 ///     - Current directory contains a `.go` file
 ///     - Current directory contains a `Godeps` directory
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_go_project = context
         .new_scan_dir()
         .set_files(&["go.mod", "go.sum", "glide.yaml", "Gopkg.yml", "Gopkg.lock"])
@@ -30,7 +30,7 @@ pub fn segment(context: &Context) -> Option<Module> {
             const GO_CHAR: &str = "🐹 ";
             let module_color = Color::Cyan.bold();
 
-            let mut module = Module::new("go");
+            let mut module = context.new_module("go");
             module.set_style(module_color);
 
             let formatted_version = format_go_version(go_version)?;
diff --git a/src/modules/line_break.rs b/src/modules/line_break.rs
index 223695dcf..0b11367ec 100644
--- a/src/modules/line_break.rs
+++ b/src/modules/line_break.rs
@@ -1,10 +1,10 @@
 use super::{Context, Module};
 
 /// Creates a segment for the line break
-pub fn segment(_context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     const LINE_ENDING: &str = "\n";
 
-    let mut module = Module::new("line_break");
+    let mut module = context.new_module("line_break");
 
     module.get_prefix().set_value("");
     module.get_suffix().set_value("");
diff --git a/src/modules/mod.rs b/src/modules/mod.rs
index 808e33744..cf1c64018 100644
--- a/src/modules/mod.rs
+++ b/src/modules/mod.rs
@@ -14,7 +14,7 @@ mod username;
 use crate::context::Context;
 use crate::module::Module;
 
-pub fn handle(module: &str, context: &Context) -> Option<Module> {
+pub fn handle<'a>(module: &str, context: &'a Context) -> Option<Module<'a>> {
     match module {
         "dir" | "directory" => directory::segment(context),
         "char" | "character" => character::segment(context),
diff --git a/src/modules/nodejs.rs b/src/modules/nodejs.rs
index b9736687e..e542acf1e 100644
--- a/src/modules/nodejs.rs
+++ b/src/modules/nodejs.rs
@@ -9,7 +9,7 @@ use super::{Context, Module};
 ///     - Current directory contains a `.js` file
 ///     - Current directory contains a `package.json` file
 ///     - Current directory contains a `node_modules` directory
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_js_project = context
         .new_scan_dir()
         .set_files(&["package.json"])
@@ -26,7 +26,7 @@ pub fn segment(context: &Context) -> Option<Module> {
             const NODE_CHAR: &str = "⬢ ";
             let module_color = Color::Green.bold();
 
-            let mut module = Module::new("node");
+            let mut module = context.new_module("node");
             module.set_style(module_color);
 
             let formatted_version = node_version.trim();
diff --git a/src/modules/package.rs b/src/modules/package.rs
index b2666c8de..a9af63891 100644
--- a/src/modules/package.rs
+++ b/src/modules/package.rs
@@ -1,23 +1,20 @@
 use super::{Context, Module};
+use crate::utils;
 
 use ansi_term::Color;
-use serde_json;
-use std::fs::File;
-use std::io;
-use std::io::Read;
-use std::path::PathBuf;
+use serde_json as json;
 use toml;
 
 /// Creates a segment with the current package version
 ///
 /// Will display if a version is defined for your Node.js or Rust project (if one exists)
-pub fn segment(context: &Context) -> Option<Module> {
-    match get_package_version(context) {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
+    match get_package_version() {
         Some(package_version) => {
             const PACKAGE_CHAR: &str = "📦 ";
             let module_color = Color::Red.bold();
 
-            let mut module = Module::new("package");
+            let mut module = context.new_module("package");
             module.set_style(module_color);
             module.get_prefix().set_value("is ");
 
@@ -30,27 +27,8 @@ pub fn segment(context: &Context) -> Option<Module> {
     }
 }
 
-// TODO: Combine into one function and just call for different file names!
-fn is_cargo_toml(dir_entry: &PathBuf) -> bool {
-    dir_entry.is_file() && dir_entry.file_name().unwrap_or_default() == "Cargo.toml"
-}
-
-fn is_package_json(dir_entry: &PathBuf) -> bool {
-    dir_entry.is_file() && dir_entry.file_name().unwrap_or_default() == "package.json"
-}
-
-// TODO: Move to `utils.rs` file and import
-fn read_file(file_name: &str) -> io::Result<String> {
-    let mut file = File::open(file_name)?;
-    let mut data = String::new();
-
-    file.read_to_string(&mut data)?;
-
-    Ok(data)
-}
-
 fn extract_cargo_version(file_contents: &str) -> Option<String> {
-    let cargo_toml = file_contents.parse::<toml::Value>().ok()?;
+    let cargo_toml: toml::Value = toml::from_str(&file_contents).ok()?;
     let raw_version = cargo_toml.get("package")?.get("version")?.as_str()?;
 
     let formatted_version = format_version(raw_version);
@@ -58,7 +36,7 @@ fn extract_cargo_version(file_contents: &str) -> Option<String> {
 }
 
 fn extract_package_version(file_contents: &str) -> Option<String> {
-    let package_json: serde_json::Value = serde_json::from_str(&file_contents).ok()?;
+    let package_json: json::Value = json::from_str(&file_contents).ok()?;
     let raw_version = package_json.get("version")?.as_str()?;
     if raw_version == "null" {
         return None;
@@ -68,17 +46,15 @@ fn extract_package_version(file_contents: &str) -> Option<String> {
     Some(formatted_version)
 }
 
-fn get_package_version(context: &Context) -> Option<String> {
-    let has_cargo_toml = context.dir_files.iter().any(is_cargo_toml);
-    if has_cargo_toml {
-        let file_contents = read_file("Cargo.toml").ok()?;
-        return extract_cargo_version(&file_contents);
+fn get_package_version() -> Option<String> {
+    let cargo_toml = utils::read_file("Cargo.toml");
+    if let Ok(cargo_toml) = cargo_toml {
+        return extract_cargo_version(&cargo_toml);
     }
 
-    let has_package_json = context.dir_files.iter().any(is_package_json);
-    if has_package_json {
-        let file_contents = read_file("package.json").ok()?;
-        return extract_package_version(&file_contents);
+    let package_json = utils::read_file("package.json");
+    if let Ok(package_json) = package_json {
+        return extract_package_version(&package_json);
     }
 
     None
@@ -99,15 +75,19 @@ mod tests {
 
     #[test]
     fn test_extract_cargo_version() {
-        let cargo_with_version = "[package]
-            name = \"starship\"
-            version = \"0.1.0\"";
+        let cargo_with_version = r#"
+            [package]
+            name = "starship"
+            version = "0.1.0"
+            "#;
 
         let expected_version = Some("v0.1.0".to_string());
         assert_eq!(extract_cargo_version(&cargo_with_version), expected_version);
 
-        let cargo_without_version = "[package]
-            name = \"starship\"";
+        let cargo_without_version = r#"
+            [package]
+            name = "starship"
+            "#;
 
         let expected_version = None;
         assert_eq!(
@@ -118,7 +98,7 @@ mod tests {
 
     #[test]
     fn test_extract_package_version() {
-        let package_with_version = serde_json::json!({
+        let package_with_version = json::json!({
             "name": "spacefish",
             "version": "0.1.0"
         })
@@ -130,7 +110,7 @@ mod tests {
             expected_version
         );
 
-        let package_without_version = serde_json::json!({
+        let package_without_version = json::json!({
             "name": "spacefish"
         })
         .to_string();
diff --git a/src/modules/python.rs b/src/modules/python.rs
index f19da3509..8b72e5187 100644
--- a/src/modules/python.rs
+++ b/src/modules/python.rs
@@ -10,15 +10,10 @@ use super::{Context, Module};
 ///     - Current directory contains a `.python-version` file
 ///     - Current directory contains a `requirements.txt` file
 ///     - Current directory contains a `pyproject.toml` file
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_py_project = context
         .new_scan_dir()
-        .set_files(&[
-            "requirements.txt",
-            ".python-version",
-            "pyproject.toml",
-            "pyproject.toml",
-        ])
+        .set_files(&["requirements.txt", ".python-version", "pyproject.toml"])
         .set_extensions(&["py"])
         .scan();
 
@@ -31,7 +26,7 @@ pub fn segment(context: &Context) -> Option<Module> {
             const PYTHON_CHAR: &str = "🐍 ";
             let module_color = Color::Yellow.bold();
 
-            let mut module = Module::new("python");
+            let mut module = context.new_module("python");
             module.set_style(module_color);
 
             let formatted_version = format_python_version(python_version);
diff --git a/src/modules/rust.rs b/src/modules/rust.rs
index ab3679e76..9ccdcc5d2 100644
--- a/src/modules/rust.rs
+++ b/src/modules/rust.rs
@@ -8,7 +8,7 @@ use super::{Context, Module};
 /// Will display the Rust version if any of the following criteria are met:
 ///     - Current directory contains a file with a `.rs` extension
 ///     - Current directory contains a `Cargo.toml` file
-pub fn segment(context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_rs_project = context
         .new_scan_dir()
         .set_files(&["Cargo.toml"])
@@ -24,7 +24,7 @@ pub fn segment(context: &Context) -> Option<Module> {
             const RUST_CHAR: &str = "🦀 ";
             let module_color = Color::Red.bold();
 
-            let mut module = Module::new("rust");
+            let mut module = context.new_module("rust");
             module.set_style(module_color);
 
             let formatted_version = format_rustc_version(rust_version);
diff --git a/src/modules/username.rs b/src/modules/username.rs
index 1e35ff679..8885791b9 100644
--- a/src/modules/username.rs
+++ b/src/modules/username.rs
@@ -10,7 +10,7 @@ use super::{Context, Module};
 ///     - The current user isn't the same as the one that is logged in ($LOGNAME != $USER)
 ///     - The current user is root (UID = 0)
 ///     - The user is currently connected as an SSH session ($SSH_CONNECTION)
-pub fn segment(_context: &Context) -> Option<Module> {
+pub fn segment<'a>(context: &'a Context) -> Option<Module<'a>> {
     let user = env::var("USER").ok();
     let logname = env::var("LOGNAME").ok();
     let ssh_connection = env::var("SSH_CONNECTION").ok();
@@ -18,7 +18,7 @@ pub fn segment(_context: &Context) -> Option<Module> {
     let mut module_color = Color::Yellow.bold();
 
     if user != logname || ssh_connection.is_some() || is_root(&mut module_color) {
-        let mut module = Module::new("username");
+        let mut module = context.new_module("username");
         module.set_style(module_color);
         module.new_segment("username", user?);
 
diff --git a/src/segment.rs b/src/segment.rs
index 0d71af1af..4e3a2c086 100644
--- a/src/segment.rs
+++ b/src/segment.rs
@@ -1,4 +1,4 @@
-use ansi_term::{ANSIString, ANSIStrings, Style};
+use ansi_term::{ANSIString, Style};
 use std::fmt;
 
 /// A segment is a single configurable element in a module. This will usually
@@ -11,14 +11,8 @@ pub struct Segment {
     /// The segment's style. If None, will inherit the style of the module containing it.
     style: Option<Style>,
 
-    /// The prefix used to preceed the contents of a segment.
-    prefix: Option<SegmentAffix>,
-
     /// The string value of the current segment.
     value: String,
-
-    /// The suffix used following the contents of a segment.
-    suffix: Option<SegmentAffix>,
 }
 
 impl Segment {
@@ -27,9 +21,7 @@ impl Segment {
         Segment {
             name: name.to_string(),
             style: None,
-            prefix: None,
             value: "".to_string(),
-            suffix: None,
         }
     }
 
@@ -54,59 +46,6 @@ impl Segment {
     }
 
     // Returns the ANSIString of the segment value, not including its prefix and suffix
-    fn value_ansi_string(&self) -> ANSIString {
-        match self.style {
-            Some(style) => style.paint(&self.value),
-            None => ANSIString::from(&self.value),
-        }
-    }
-
-    /// Returns a vector of colored ANSIString elements to be later used with
-    /// `ANSIStrings()` to optimize ANSI codes
-    pub fn ansi_strings(&self) -> Vec<ANSIString> {
-        let prefix = self.prefix.as_ref().and_then(|p| Some(p.ansi_string()));
-        let suffix = self.suffix.as_ref().and_then(|s| Some(s.ansi_string()));
-        let value = Some(self.value_ansi_string());
-
-        // Remove `None` values from the vector
-        vec![prefix, value, suffix]
-            .into_iter()
-            .filter_map(|e| e)
-            .collect::<Vec<ANSIString>>()
-    }
-}
-
-impl fmt::Display for Segment {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let ansi_strings = self.ansi_strings();
-