1 files changed, 69 insertions, 0 deletions
diff --git a/starship/src/modules/character.rs b/starship/src/modules/character.rs
new file mode 100644
index 000000000..9385e53c9
--- /dev/null
+++ b/starship/src/modules/character.rs
@@ -0,0 +1,69 @@
+use super::{Context, Module};
+use ansi_term::Color;
+
+/// Creates a module for the prompt character
+///
+/// The character segment prints an arrow character in a color dependant on the exit-
+/// code of the last executed command:
+/// - If the exit-code was "0", the arrow will be formatted with `style_success`
+/// (green by default)
+/// - If the exit-code was anything else, the arrow will be formatted with
+/// `style_failure` (red by default)
+pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
+    const SUCCESS_CHAR: &str = "❯";
+    const FAILURE_CHAR: &str = "✖";
+    const VICMD_CHAR: &str = "❮";
+    enum ShellEditMode {
+        Normal,
+        Insert,
+    };
+    const ASSUMED_MODE: ShellEditMode = ShellEditMode::Insert;
+    // TODO: extend config to more modes
+
+    let mut module = context.new_module("character");
+    module.get_prefix().set_value("");
+
+    let style_success = module
+        .config_value_style("style_success")
+        .unwrap_or_else(|| Color::Green.bold());
+    let style_failure = module
+        .config_value_style("style_failure")
+        .unwrap_or_else(|| Color::Red.bold());
+
+    let arguments = &context.arguments;
+    let use_symbol = module
+        .config_value_bool("use_symbol_for_status")
+        .unwrap_or(false);
+    let exit_success = arguments.value_of("status_code").unwrap_or("0") == "0";
+    let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
+    let keymap = arguments.value_of("keymap").unwrap_or("viins");
+
+    // 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) {
+        ("fish", "default") | ("zsh", "vicmd") => ShellEditMode::Normal,
+        _ => ASSUMED_MODE,
+    };
+
+    /* If an error symbol is set in the config, use symbols to indicate
+    success/failure, in addition to color */
+    let symbol = if use_symbol && !exit_success {
+        module.new_segment("error_symbol", FAILURE_CHAR)
+    } else {
+        match mode {
+            ShellEditMode::Normal => module.new_segment("vicmd_symbol", VICMD_CHAR),
+            ShellEditMode::Insert => module.new_segment("symbol", SUCCESS_CHAR),
+        }
+    };
+
+    if exit_success {
+        symbol.set_style(style_success);
+    } else {
+        symbol.set_style(style_failure);
+    };
+
+    Some(module)
+}