ssh: support %l and %L in config files

We also log a warning when an unsupported token is used.

refs: https://github.com/wez/wezterm/issues/3176

Cargo.lock

@@ -1734,6 +1734,16 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "gethostname"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a329e22866dd78b35d2c639a4a23d7b950aeae300dfd79f4fb19f74055c2404"
+dependencies = [
+ "libc",
+ "windows 0.43.0",
+]
+
 [[package]]
 name = "getopts"
 version = "0.2.21"
@@ -6061,6 +6071,7 @@ dependencies = [
  "env_logger",
  "filedescriptor",
  "filenamegen",
+ "gethostname",
  "k9",
  "libc",
  "libssh-rs",
@@ -6360,6 +6371,21 @@ dependencies = [
  "windows_x86_64_msvc 0.33.0",
 ]
 
+[[package]]
+name = "windows"
+version = "0.43.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04662ed0e3e5630dfa9b26e4cb823b817f1a9addda855d973a9458c236556244"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc 0.42.1",
+ "windows_i686_gnu 0.42.1",
+ "windows_i686_msvc 0.42.1",
+ "windows_x86_64_gnu 0.42.1",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc 0.42.1",
+]
+
 [[package]]
 name = "windows"
 version = "0.44.0"

docs/changelog.md

@@ -71,6 +71,8 @@ As features stabilize some brief notes about them will accumulate here.
 * `CTRL-SHIFT-P` now activates the new [command
   palette](config/lua/keyassignment/ActivateCommandPalette.md)
   [#1485](https://github.com/wez/wezterm/issues/1485)
+* `wezterm sssh` now supports `%l` and `%L` tokens in config files.
+  [#3176](https://github.com/wez/wezterm/issues/3176)
 
 #### Fixed
 * X11: hanging or killing the IME could hang wezterm

wezterm-ssh/Cargo.toml

@@ -24,6 +24,7 @@ camino = "1.0"
 dirs-next = "2.0"
 filedescriptor = { version="0.8", path = "../filedescriptor" }
 filenamegen = "0.2"
+gethostname = "0.4"
 libc = "0.2"
 log = "0.4"
 portable-pty = { version="0.8", path = "../pty" }

wezterm-ssh/src/config.rs

@@ -477,6 +477,19 @@ impl Config {
         }
     }
 
+    fn resolve_local_host(&self, include_domain_name: bool) -> String {
+        let hostname = gethostname::gethostname().to_string_lossy().to_string();
+
+        if include_domain_name {
+            hostname
+        } else {
+            match hostname.split_once('.') {
+                Some((hostname, _domain)) => hostname.to_string(),
+                None => hostname,
+            }
+        }
+    }
+
     fn resolve_local_user(&self) -> String {
         for user in &["USER", "USERNAME"] {
             if let Some(user) = self.resolve_env(user) {
@@ -621,11 +634,16 @@ impl Config {
 
     /// Perform token substitution
     fn expand_tokens(&self, value: &mut String, tokens: &[&str], token_map: &ConfigMap) {
+        let orig_value = value.to_string();
         for &t in tokens {
             if let Some(v) = token_map.get(t) {
                 *value = value.replace(t, v);
             } else if t == "%u" {
                 *value = value.replace(t, &self.resolve_local_user());
+            } else if t == "%l" {
+                *value = value.replace(t, &self.resolve_local_host(false));
+            } else if t == "%L" {
+                *value = value.replace(t, &self.resolve_local_host(true));
             } else if t == "%d" {
                 if let Some(home) = self.resolve_home() {
                     let mut items = value
@@ -641,6 +659,8 @@ impl Config {
                     }
                     *value = items.join(" ");
                 }
+            } else if value.contains(t) {
+                log::warn!("Unsupported token {t} when evaluating `{orig_value}`");
             }
         }