enable starting hx with a working directory (#8223)

* added working path arg to cli and help menu

* improve working path cli arg handling

* enable hx to set the working path

* applied cargo formatting

* improved code from cargo clippy suggestion

* improved code from follow up review

* fix for -w <path> is set but args.files is empty

* improved formatting of --help output

1 files changed, 15 insertions, 0 deletions

diff --git a/helix-term/src/args.rs b/helix-term/src/args.rs
index dd787f1f..f782539c 100644
--- a/helix-term/src/args.rs
+++ b/helix-term/src/args.rs
@@ -17,6 +17,7 @@ pub struct Args {
     pub log_file: Option<PathBuf>,
     pub config_file: Option<PathBuf>,
     pub files: Vec<(PathBuf, Position)>,
+    pub working_directory: Option<PathBuf>,
 }
 
 impl Args {
@@ -59,6 +60,20 @@ impl Args {
                     Some(path) => args.log_file = Some(path.into()),
                     None => anyhow::bail!("--log must specify a path to write"),
                 },
+                "-w" | "--working-dir" => match argv.next().as_deref() {
+                    Some(path) => {
+                        args.working_directory = if Path::new(path).is_dir() {
+                            Some(PathBuf::from(path))
+                        } else {
+                            anyhow::bail!(
+                                "--working-dir specified does not exist or is not a directory"
+                            )
+                        }
+                    }
+                    None => {
+                        anyhow::bail!("--working-dir must specify an initial working directory")
+                    }
+                },
                 arg if arg.starts_with("--") => {
                     anyhow::bail!("unexpected double dash argument: {}", arg)
                 }