wezterm cli split-pane now respects cwd of source pane

closes: https://github.com/wez/wezterm/issues/766

docs/changelog.md

@@ -14,6 +14,7 @@ As features stabilize some brief notes about them will accumulate here.
 * Fixed: ssh client would read `/etc/ssh/config` rather than the proper `/etc/ssh/ssh_config`
 * x11: support for [VoidSymbol](config/keys.md#voidsymbol) in key assignments. Thanks to [@digitallyserviced](https://github.com/digitallyserviced)! [#759](https://github.com/wez/wezterm/pull/759)
 * Fixed: UTF8-encoded-C1 control codes were not always recognized as control codes, and could result in a panic when later attempting to update the line. [#768](https://github.com/wez/wezterm/issues/768)
+* Fixed: `wezterm cli split-pane` didn't use the current working dir of the source pane. [#766](https://github.com/wez/wezterm/issues/766)
 
 ### 20210502-154244-3f7122cb
 

wezterm-mux-server-impl/src/sessionhandler.rs

@@ -607,14 +607,26 @@ async fn split_pane(split: SplitPane, sender: PduSender) -> anyhow::Result<Pdu>
             .ok_or_else(|| anyhow!("domain name {} is invalid", name))?,
     };
 
+    let pane_id = split.pane_id;
+    let cwd = split.command_dir.or_else(|| {
+        mux.get_pane(pane_id)
+            .and_then(|pane| pane.get_current_working_dir())
+            .map(|url| {
+                let path = url.path().to_string();
+                // On Windows the file URI can produce a path like:
+                // `/C:\Users` which is valid in a file URI, but the leading slash
+                // is not liked by the windows file APIs, so we strip it off here.
+                let bytes = path.as_bytes();
+                if bytes.len() > 2 && bytes[0] == b'/' && bytes[2] == b':' {
+                    path[1..].to_owned()
+                } else {
+                    path
+                }
+            })
+    });
+
     let pane = domain
-        .split_pane(
-            split.command,
-            split.command_dir,
-            tab_id,
-            split.pane_id,
-            split.direction,
-        )
+        .split_pane(split.command, cwd, tab_id, split.pane_id, split.direction)
         .await?;
     let dims = pane.get_dimensions();
     let size = PtySize {