Open files with spaces in filename, allow opening multiple files (#1231)

3 files changed, 239 insertions, 71 deletions

diff --git a/helix-core/src/lib.rs b/helix-core/src/lib.rs
index 4ae044cc..92a59f31 100644
--- a/helix-core/src/lib.rs
+++ b/helix-core/src/lib.rs
@@ -17,6 +17,7 @@ mod position;
 pub mod register;
 pub mod search;
 pub mod selection;
+pub mod shellwords;
 mod state;
 pub mod surround;
 pub mod syntax;
diff --git a/helix-core/src/shellwords.rs b/helix-core/src/shellwords.rs
new file mode 100644
index 00000000..13f6f3e9
--- /dev/null
+++ b/helix-core/src/shellwords.rs
@@ -0,0 +1,164 @@
+use std::borrow::Cow;
+
+/// Get the vec of escaped / quoted / doublequoted filenames from the input str
+pub fn shellwords(input: &str) -> Vec<Cow<'_, str>> {
+    enum State {
+        Normal,
+        NormalEscaped,
+        Quoted,
+        QuoteEscaped,
+        Dquoted,
+        DquoteEscaped,
+    }
+
+    use State::*;
+
+    let mut state = Normal;
+    let mut args: Vec<Cow<str>> = Vec::new();
+    let mut escaped = String::with_capacity(input.len());
+
+    let mut start = 0;
+    let mut end = 0;
+
+    for (i, c) in input.char_indices() {
+        state = match state {
+            Normal => match c {
+                '\\' => {
+                    escaped.push_str(&input[start..i]);
+                    start = i + 1;
+                    NormalEscaped
+                }
+                '"' => {
+                    end = i;
+                    Dquoted
+                }
+                '\'' => {
+                    end = i;
+                    Quoted
+                }
+                c if c.is_ascii_whitespace() => {
+                    end = i;
+                    Normal
+                }
+                _ => Normal,
+            },
+            NormalEscaped => Normal,
+            Quoted => match c {
+                '\\' => {
+                    escaped.push_str(&input[start..i]);
+                    start = i + 1;
+                    QuoteEscaped
+                }
+                '\'' => {
+                    end = i;
+                    Normal
+                }
+                _ => Quoted,
+            },
+            QuoteEscaped => Quoted,
+            Dquoted => match c {
+                '\\' => {
+                    escaped.push_str(&input[start..i]);
+                    start = i + 1;
+                    DquoteEscaped
+                }
+                '"' => {
+                    end = i;
+                    Normal
+                }
+                _ => Dquoted,
+            },
+            DquoteEscaped => Dquoted,
+        };
+
+        if i >= input.len() - 1 && end == 0 {
+            end = i + 1;
+        }
+
+        if end > 0 {
+            let esc_trim = escaped.trim();
+            let inp = &input[start..end];
+
+            if !(esc_trim.is_empty() && inp.trim().is_empty()) {
+                if esc_trim.is_empty() {
+                    args.push(inp.into());
+                } else {
+                    args.push([escaped, inp.into()].concat().into());
+                    escaped = "".to_string();
+                }
+            }
+            start = i + 1;
+            end = 0;
+        }
+    }
+    args
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_normal() {
+        let input = r#":o single_word twó wörds \three\ \"with\ escaping\\"#;
+        let result = shellwords(input);
+        let expected = vec![
+            Cow::from(":o"),
+            Cow::from("single_word"),
+            Cow::from("twó"),
+            Cow::from("wörds"),
+            Cow::from(r#"three "with escaping\"#),
+        ];
+        // TODO test is_owned and is_borrowed, once they get stabilized.
+        assert_eq!(expected, result);
+    }
+
+    #[test]
+    fn test_quoted() {
+        let quoted =
+            r#":o 'single_word' 'twó wörds' '' ' ''\three\' \"with\ escaping\\' 'quote incomplete"#;
+        let result = shellwords(quoted);
+        let expected = vec![
+            Cow::from(":o"),
+            Cow::from("single_word"),
+            Cow::from("twó wörds"),
+            Cow::from(r#"three' "with escaping\"#),
+            Cow::from("quote incomplete"),
+        ];
+        assert_eq!(expected, result);
+    }
+
+    #[test]
+    fn test_dquoted() {
+        let dquoted = r#":o "single_word" "twó wörds" "" "  ""\three\' \"with\ escaping\\" "dquote incomplete"#;
+        let result = shellwords(dquoted);
+        let expected = vec![
+            Cow::from(":o"),
+            Cow::from("single_word"),
+            Cow::from("twó wörds"),
+            Cow::from(r#"three' "with escaping\"#),
+            Cow::from("dquote incomplete"),
+        ];
+        assert_eq!(expected, result);
+    }
+
+    #[test]
+    fn test_mixed() {
+        let dquoted = r#":o single_word 'twó wörds' "\three\' \"with\ escaping\\""no space before"'and after' $#%^@ "%^&(%^" ')(*&^%''a\\\\\b' '"#;
+        let result = shellwords(dquoted);
+        let expected = vec![
+            Cow::from(":o"),
+            Cow::from("single_word"),
+            Cow::from("twó wörds"),
+            Cow::from("three' \"with escaping\\"),
+            Cow::from("no space before"),
+            Cow::from("and after"),
+            Cow::from("$#%^@"),
+            Cow::from("%^&(%^"),
+            Cow::from(")(*&^%"),
+            Cow::from(r#"a\\b"#),
+            //last ' just changes to quoted but since we dont have anything after it, it should be ignored
+        ];
+        assert_eq!(expected, result);
+    }
+}
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 87c5a63f..314cd11f 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -10,7 +10,7 @@ use helix_core::{
     movement::{self, Direction},
     object, pos_at_coords,
     regex::{self, Regex, RegexBuilder},
-    search, selection, surround, textobject,
+    search, selection, shellwords, surround, textobject,
     unicode::width::UnicodeWidthChar,
     LineEnding, Position, Range, Rope, RopeGraphemes, RopeSlice, Selection, SmallVec, Tendril,
     Transaction,
@@ -173,14 +173,14 @@ impl MappableCommand {
     pub fn execute(&self, cx: &mut Context) {
         match &self {
             MappableCommand::Typable { name, args, doc: _ } => {
-                let args: Vec<&str> = args.iter().map(|arg| arg.as_str()).collect();
+                let args: Vec<Cow<str>> = args.iter().map(Cow::from).collect();
                 if let Some(command) = cmd::TYPABLE_COMMAND_MAP.get(name.as_str()) {
                     let mut cx = compositor::Context {
                         editor: cx.editor,
                         jobs: cx.jobs,
                         scroll: None,
                     };
-                    if let Err(e) = (command.fun)(&mut cx, &args, PromptEvent::Validate) {
+                    if let Err(e) = (command.fun)(&mut cx, &args[..], PromptEvent::Validate) {
                         cx.editor.set_error(format!("{}", e));
                     }
                 }
@@ -1963,13 +1963,13 @@ pub mod cmd {
         pub aliases: &'static [&'static str],
         pub doc: &'static str,
         // params, flags, helper, completer
-        pub fun: fn(&mut compositor::Context, &[&str], PromptEvent) -> anyhow::Result<()>,
+        pub fun: fn(&mut compositor::Context, &[Cow<str>], PromptEvent) -> anyhow::Result<()>,
         pub completer: Option<Completer>,
     }
 
     fn quit(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         // last view and we have unsaved changes
@@ -1984,7 +1984,7 @@ pub mod cmd {
 
     fn force_quit(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         cx.editor.close(view!(cx.editor).id);
@@ -1994,17 +1994,19 @@ pub mod cmd {
 
     fn open(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
-        let path = args.get(0).context("wrong argument count")?;
-        let _ = cx.editor.open(path.into(), Action::Replace)?;
+        ensure!(!args.is_empty(), "wrong argument count");
+        for arg in args {
+            let _ = cx.editor.open(arg.as_ref().into(), Action::Replace)?;
+        }
         Ok(())
     }
 
     fn buffer_close(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let view = view!(cx.editor);
@@ -2015,7 +2017,7 @@ pub mod cmd {
 
     fn force_buffer_close(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let view = view!(cx.editor);
@@ -2024,15 +2026,12 @@ pub mod cmd {
         Ok(())
     }
 
-    fn write_impl<P: AsRef<Path>>(
-        cx: &mut compositor::Context,
-        path: Option<P>,
-    ) -> anyhow::Result<()> {
+    fn write_impl(cx: &mut compositor::Context, path: Option<&Cow<str>>) -> anyhow::Result<()> {
         let jobs = &mut cx.jobs;
         let (_, doc) = current!(cx.editor);
 
         if let Some(ref path) = path {
-            doc.set_path(Some(path.as_ref()))
+            doc.set_path(Some(path.as_ref().as_ref()))
                 .context("invalid filepath")?;
         }
         if doc.path().is_none() {
@@ -2061,7 +2060,7 @@ pub mod cmd {
 
     fn write(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         write_impl(cx, args.first())
@@ -2069,7 +2068,7 @@ pub mod cmd {
 
     fn new_file(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         cx.editor.new_file(Action::Replace);
@@ -2079,7 +2078,7 @@ pub mod cmd {
 
     fn format(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let (_, doc) = current!(cx.editor);
@@ -2094,7 +2093,7 @@ pub mod cmd {
     }
     fn set_indent_style(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         use IndentStyle::*;
@@ -2114,7 +2113,7 @@ pub mod cmd {
         // Attempt to parse argument as an indent style.
         let style = match args.get(0) {
             Some(arg) if "tabs".starts_with(&arg.to_lowercase()) => Some(Tabs),
-            Some(&"0") => Some(Tabs),
+            Some(Cow::Borrowed("0")) => Some(Tabs),
             Some(arg) => arg
                 .parse::<u8>()
                 .ok()
@@ -2133,7 +2132,7 @@ pub mod cmd {
     /// Sets or reports the current document's line ending setting.
     fn set_line_ending(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         use LineEnding::*;
@@ -2177,7 +2176,7 @@ pub mod cmd {
 
     fn earlier(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let uk = args.join(" ").parse::<UndoKind>().map_err(|s| anyhow!(s))?;
@@ -2193,7 +2192,7 @@ pub mod cmd {
 
     fn later(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let uk = args.join(" ").parse::<UndoKind>().map_err(|s| anyhow!(s))?;
@@ -2208,7 +2207,7 @@ pub mod cmd {
 
     fn write_quit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         write_impl(cx, args.first())?;
@@ -2217,7 +2216,7 @@ pub mod cmd {
 
     fn force_write_quit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         write_impl(cx, args.first())?;
@@ -2248,7 +2247,7 @@ pub mod cmd {
 
     fn write_all_impl(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
         quit: bool,
         force: bool,
@@ -2284,7 +2283,7 @@ pub mod cmd {
 
     fn write_all(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         write_all_impl(cx, args, event, false, false)
@@ -2292,7 +2291,7 @@ pub mod cmd {
 
     fn write_all_quit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         write_all_impl(cx, args, event, true, false)
@@ -2300,7 +2299,7 @@ pub mod cmd {
 
     fn force_write_all_quit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         write_all_impl(cx, args, event, true, true)
@@ -2308,7 +2307,7 @@ pub mod cmd {
 
     fn quit_all_impl(
         editor: &mut Editor,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
         force: bool,
     ) -> anyhow::Result<()> {
@@ -2327,7 +2326,7 @@ pub mod cmd {
 
     fn quit_all(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         quit_all_impl(cx.editor, args, event, false)
@@ -2335,7 +2334,7 @@ pub mod cmd {
 
     fn force_quit_all(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         event: PromptEvent,
     ) -> anyhow::Result<()> {
         quit_all_impl(cx.editor, args, event, true)
@@ -2343,7 +2342,7 @@ pub mod cmd {
 
     fn cquit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let exit_code = args
@@ -2362,7 +2361,7 @@ pub mod cmd {
 
     fn theme(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let theme = args.first().context("theme not provided")?;
@@ -2371,7 +2370,7 @@ pub mod cmd {
 
     fn yank_main_selection_to_clipboard(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         yank_main_selection_to_clipboard_impl(cx.editor, ClipboardType::Clipboard)
@@ -2379,20 +2378,18 @@ pub mod cmd {
 
     fn yank_joined_to_clipboard(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let (_, doc) = current!(cx.editor);
-        let separator = args
-            .first()
-            .copied()
-            .unwrap_or_else(|| doc.line_ending.as_str());
+        let default_sep = Cow::Borrowed(doc.line_ending.as_str());
+        let separator = args.first().unwrap_or(&default_sep);
         yank_joined_to_clipboard_impl(cx.editor, separator, ClipboardType::Clipboard)
     }
 
     fn yank_main_selection_to_primary_clipboard(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         yank_main_selection_to_clipboard_impl(cx.editor, ClipboardType::Selection)
@@ -2400,20 +2397,18 @@ pub mod cmd {
 
     fn yank_joined_to_primary_clipboard(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let (_, doc) = current!(cx.editor);
-        let separator = args
-            .first()
-            .copied()
-            .unwrap_or_else(|| doc.line_ending.as_str());
+        let default_sep = Cow::Borrowed(doc.line_ending.as_str());
+        let separator = args.first().unwrap_or(&default_sep);
         yank_joined_to_clipboard_impl(cx.editor, separator, ClipboardType::Selection)
     }
 
     fn paste_clipboard_after(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         paste_clipboard_impl(cx.editor, Paste::After, ClipboardType::Clipboard)
@@ -2421,7 +2416,7 @@ pub mod cmd {
 
     fn paste_clipboard_before(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         paste_clipboard_impl(cx.editor, Paste::After, ClipboardType::Clipboard)
@@ -2429,7 +2424,7 @@ pub mod cmd {
 
     fn paste_primary_clipboard_after(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         paste_clipboard_impl(cx.editor, Paste::After, ClipboardType::Selection)
@@ -2437,7 +2432,7 @@ pub mod cmd {
 
     fn paste_primary_clipboard_before(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         paste_clipboard_impl(cx.editor, Paste::After, ClipboardType::Selection)
@@ -2467,7 +2462,7 @@ pub mod cmd {
 
     fn replace_selections_with_clipboard(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         replace_selections_with_clipboard_impl(cx, ClipboardType::Clipboard)
@@ -2475,7 +2470,7 @@ pub mod cmd {
 
     fn replace_selections_with_primary_clipboard(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         replace_selections_with_clipboard_impl(cx, ClipboardType::Selection)
@@ -2483,7 +2478,7 @@ pub mod cmd {
 
     fn show_clipboard_provider(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         cx.editor
@@ -2493,12 +2488,13 @@ pub mod cmd {
 
     fn change_current_directory(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let dir = helix_core::path::expand_tilde(
             args.first()
                 .context("target directory not provided")?
+                .as_ref()
                 .as_ref(),
         );
 
@@ -2516,7 +2512,7 @@ pub mod cmd {
 
     fn show_current_directory(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let cwd = std::env::current_dir().context("Couldn't get the new working directory")?;
@@ -2528,7 +2524,7 @@ pub mod cmd {
     /// Sets the [`Document`]'s encoding..
     fn set_encoding(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let (_, doc) = current!(cx.editor);
@@ -2544,7 +2540,7 @@ pub mod cmd {
     /// Reload the [`Document`] from its source file.
     fn reload(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let (view, doc) = current!(cx.editor);
@@ -2553,7 +2549,7 @@ pub mod cmd {
 
     fn tree_sitter_scopes(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let (view, doc) = current!(cx.editor);
@@ -2567,15 +2563,18 @@ pub mod cmd {
 
     fn vsplit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let id = view!(cx.editor).doc;
 
-        if let Some(path) = args.get(0) {
-            cx.editor.open(path.into(), Action::VerticalSplit)?;
-        } else {
+        if args.is_empty() {
             cx.editor.switch(id, Action::VerticalSplit);
+        } else {
+            for arg in args {
+                cx.editor
+                    .open(PathBuf::from(arg.as_ref()), Action::VerticalSplit)?;
+            }
         }
 
         Ok(())
@@ -2583,15 +2582,18 @@ pub mod cmd {
 
     fn hsplit(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let id = view!(cx.editor).doc;
 
-        if let Some(path) = args.get(0) {
-            cx.editor.open(path.into(), Action::HorizontalSplit)?;
-        } else {
+        if args.is_empty() {
             cx.editor.switch(id, Action::HorizontalSplit);
+        } else {
+            for arg in args {
+                cx.editor
+                    .open(PathBuf::from(arg.as_ref()), Action::HorizontalSplit)?;
+            }
         }
 
         Ok(())
@@ -2599,7 +2601,7 @@ pub mod cmd {
 
     fn tutor(
         cx: &mut compositor::Context,
-        _args: &[&str],
+        _args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         let path = helix_core::runtime_dir().join("tutor.txt");
@@ -2611,7 +2613,7 @@ pub mod cmd {
 
     pub(super) fn goto_line_number(
         cx: &mut compositor::Context,
-        args: &[&str],
+        args: &[Cow<str>],
         _event: PromptEvent,
     ) -> anyhow::Result<()> {
         ensure!(!args.is_empty(), "Line number required");
@@ -2980,7 +2982,7 @@ fn command_mode(cx: &mut Context) {
 
             // If command is numeric, interpret as line number and go there.
             if parts.len() == 1 && parts[0].parse::<usize>().ok().is_some() {
-                if let Err(e) = cmd::goto_line_number(cx, &parts[0..], event) {
+                if let Err(e) = cmd::goto_line_number(cx, &[Cow::from(parts[0])], event) {
                     cx.editor.set_error(format!("{}", e));
                 }
                 return;
@@ -2988,7 +2990,8 @@ fn command_mode(cx: &mut Context) {
 
             // Handle typable commands
             if let Some(cmd) = cmd::TYPABLE_COMMAND_MAP.get(parts[0]) {
-                if let Err(e) = (cmd.fun)(cx, &parts[1..], event) {
+                let args = shellwords::shellwords(input);
+                if let Err(e) = (cmd.fun)(cx, &args[1..], event) {
                     cx.editor.set_error(format!("{}", e));
                 }
             } else {