Initial public release of Warp.

Repo-Sync-Origin: warpdotdev/warp-internal@12af1d983b

app/src/terminal/alias.rs

@@ -0,0 +1,51 @@
+use crate::terminal::model::session::Session;
+use smol_str::SmolStr;
+use std::sync::Arc;
+use warp_completer::parsers::simple::all_parsed_commands;
+
+/// Contains information about an aliased command.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct AliasedCommand {
+    /// The alias itself.
+    pub alias: SmolStr,
+    /// The value that the alias is mapped to.
+    pub alias_value: String,
+}
+
+/// Returns whether the alias can be expanded by Warp given its value.
+///
+/// We don't expand on any alias that starts with itself, as it leads to
+/// cases where the alias is expanded twice: once as the user types in the
+/// editor and again by the shell when the command is entered.
+// TODO: CORE-240 Don't expand if any command in the alias value is equal
+// to the alias itself.
+pub fn is_expandable_alias(alias: &str, alias_value: &str) -> bool {
+    if let Some(command_token) = alias_value.split_whitespace().next() {
+        return alias != command_token;
+    }
+    // If the alias value is empty, we don't expand.
+    false
+}
+
+/// Searches the source text for any aliases in a command position. Returns
+/// information about the alias if found.
+fn check_for_alias(source: &str, session: Arc<Session>) -> Option<AliasedCommand> {
+    let mut all_commands_iterator =
+        all_parsed_commands(source, session.shell_family().escape_char());
+    all_commands_iterator.find_map(|command| {
+        let first_token = command.parts.first()?;
+        let alias_value = session.alias_value(&first_token.item)?;
+        is_expandable_alias(&first_token.item, alias_value).then(|| AliasedCommand {
+            alias: first_token.item.as_str().into(),
+            alias_value: alias_value.into(),
+        })
+    })
+}
+
+pub async fn check_for_alias_async(source: &str, session: Arc<Session>) -> Option<AliasedCommand> {
+    check_for_alias(source, session)
+}
+
+#[cfg(test)]
+#[path = "alias_tests.rs"]
+pub mod tests;