refactor: improve as-a-library usage by removing ArgMatches depe… (#547)

This removes ArgMatches from the Context struct and replaces it with a simple HashMap. This work is towards getting Starship in a better place for use as a library in other shells written in Rust so they don't need to use a command-line interface to invoke and configure things.

Contributes to #521

src/context.rs

@@ -4,10 +4,12 @@ use crate::module::Module;
 use clap::ArgMatches;
 use git2::{Repository, RepositoryState};
 use once_cell::sync::OnceCell;
+use std::collections::HashMap;
 use std::env;
 use std::ffi::OsStr;
 use std::fs;
 use std::path::{Path, PathBuf};
+use std::string::String;
 
 /// Context contains data or common methods that may be used by multiple modules.
 /// The data contained within Context will be relevant to this particular rendering
@@ -22,8 +24,8 @@ pub struct Context<'a> {
     /// A vector containing the full paths of all the files in `current_dir`.
     dir_files: OnceCell<Vec<PathBuf>>,
 
-    /// The map of arguments that were passed when starship was called.
-    pub arguments: ArgMatches<'a>,
+    /// Properties to provide to modules.
+    pub properties: HashMap<&'a str, String>,
 
     /// Private field to store Git information for modules who need it
     repo: OnceCell<Repo>,
@@ -49,12 +51,22 @@ impl<'a> Context<'a> {
     {
         let config = StarshipConfig::initialize();
 
+        // Unwrap the clap arguments into a simple hashtable
+        // we only care about single arguments at this point, there isn't a
+        // use-case for a list of arguments yet.
+        let properties: HashMap<&str, std::string::String> = arguments
+            .args
+            .iter()
+            .filter(|(_, v)| !v.vals.is_empty())
+            .map(|(a, b)| (*a, b.vals.first().cloned().unwrap().into_string().unwrap()))
+            .collect();
+
         // TODO: Currently gets the physical directory. Get the logical directory.
         let current_dir = Context::expand_tilde(dir.into());
 
         Context {
             config,
-            arguments,
+            properties,
             current_dir,
             dir_files: OnceCell::new(),
             repo: OnceCell::new(),

src/modules/character.rs

@@ -22,17 +22,20 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let config: CharacterConfig = CharacterConfig::try_load(module.config);
     module.get_prefix().set_value("");
 
-    let arguments = &context.arguments;
-    let exit_success = arguments.value_of("status_code").unwrap_or("0") == "0";
+    let props = &context.properties;
+    let exit_code_default = std::string::String::from("0");
+    let exit_code = props.get("status_code").unwrap_or(&exit_code_default);
     let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
-    let keymap = arguments.value_of("keymap").unwrap_or("viins");
+    let keymap_default = std::string::String::from("viins");
+    let keymap = props.get("keymap").unwrap_or(&keymap_default);
+    let exit_success = exit_code == "0";
 
     // Match shell "keymap" names to normalized vi modes
     // NOTE: in vi mode, fish reports normal mode as "default".
     // Unfortunately, this is also the name of the non-vi default mode.
     // We do some environment detection in src/init.rs to translate.
     // The result: in non-vi fish, keymap is always reported as "insert"
-    let mode = match (shell.as_str(), keymap) {
+    let mode = match (shell.as_str(), keymap.as_str()) {
         ("fish", "default") | ("zsh", "vicmd") => ShellEditMode::Normal,
         _ => ASSUMED_MODE,
     };

src/modules/cmd_duration.rs

@@ -11,10 +11,10 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let mut module = context.new_module("cmd_duration");
     let config: CmdDurationConfig = CmdDurationConfig::try_load(module.config);
 
-    let arguments = &context.arguments;
-    let elapsed = arguments
-        .value_of("cmd_duration")
-        .unwrap_or("invalid_time")
+    let props = &context.properties;
+    let elapsed = props
+        .get("cmd_duration")
+        .unwrap_or(&"invalid_time".into())
         .parse::<u64>()
         .ok()?;
 

src/modules/jobs.rs

@@ -10,10 +10,10 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 
     module.set_style(config.style);
 
-    let arguments = &context.arguments;
-    let num_of_jobs = arguments
-        .value_of("jobs")
-        .unwrap_or("0")
+    let props = &context.properties;
+    let num_of_jobs = props
+        .get("jobs")
+        .unwrap_or(&"0".into())
         .trim()
         .parse::<i64>()
         .ok()?;