A couple more (#1149)

crates/nu-protocol/src/value/column_path.rs

@@ -48,8 +48,8 @@ impl ColumnPath {
         self.members.iter()
     }
 
-    pub fn split_last(&self) -> (&PathMember, &[PathMember]) {
-        self.members.split_last().unwrap()
+    pub fn split_last(&self) -> Option<(&PathMember, &[PathMember])> {
+        self.members.split_last()
     }
 }
 

crates/nu-source/src/pretty.rs

@@ -414,8 +414,7 @@ pub trait PrettyDebug {
         let doc = self.pretty_doc();
         let mut buffer = termcolor::Buffer::no_color();
 
-        doc.render_raw(width, &mut TermColored::new(&mut buffer))
-            .unwrap();
+        let _ = doc.render_raw(width, &mut TermColored::new(&mut buffer));
 
         String::from_utf8_lossy(buffer.as_slice()).to_string()
     }
@@ -424,8 +423,7 @@ pub trait PrettyDebug {
         let doc = self.pretty_doc();
         let mut buffer = termcolor::Buffer::ansi();
 
-        doc.render_raw(width, &mut TermColored::new(&mut buffer))
-            .unwrap();
+        let _ = doc.render_raw(width, &mut TermColored::new(&mut buffer));
 
         String::from_utf8_lossy(buffer.as_slice()).to_string()
     }

crates/nu-value-ext/src/lib.rs

@@ -291,25 +291,30 @@ pub fn insert_data_at_column_path(
     split_path: &ColumnPath,
     new_value: Value,
 ) -> Result<Value, ShellError> {
-    let (last, front) = split_path.split_last();
-    let mut original = value.clone();
+    if let Some((last, front)) = split_path.split_last() {
+        let mut original = value.clone();
 
-    let mut current: &mut Value = &mut original;
+        let mut current: &mut Value = &mut original;
 
-    for member in front {
-        let type_name = current.spanned_type_name();
+        for member in front {
+            let type_name = current.spanned_type_name();
 
-        current = get_mut_data_by_member(current, &member).ok_or_else(|| {
-            ShellError::missing_property(
-                member.plain_string(std::usize::MAX).spanned(member.span),
-                type_name,
-            )
-        })?
+            current = get_mut_data_by_member(current, &member).ok_or_else(|| {
+                ShellError::missing_property(
+                    member.plain_string(std::usize::MAX).spanned(member.span),
+                    type_name,
+                )
+            })?
+        }
+
+        insert_data_at_member(current, &last, new_value)?;
+
+        Ok(original)
+    } else {
+        Err(ShellError::untagged_runtime_error(
+            "Internal error: could not split column-path correctly",
+        ))
     }
-
-    insert_data_at_member(current, &last, new_value)?;
-
-    Ok(original)
 }
 
 pub fn replace_data_at_column_path(

src/commands/classified/internal.rs

@@ -148,10 +148,10 @@ pub(crate) async fn run_internal_command(
                     let doc = PrettyDebug::pretty_doc(&v);
                     let mut buffer = termcolor::Buffer::ansi();
 
-                    doc.render_raw(
+                    let _ = doc.render_raw(
                         context.with_host(|host| host.width() - 5),
                         &mut nu_source::TermColored::new(&mut buffer),
-                    ).unwrap();
+                    );
 
                     let value = String::from_utf8_lossy(buffer.as_slice());
 

src/commands/config.rs

@@ -155,7 +155,7 @@ pub fn config(
 
             if result.contains_key(&key) {
                 result.swap_remove(&key);
-                config::write(&result, &configuration).unwrap();
+                config::write(&result, &configuration)?
             } else {
                 yield Err(ShellError::labeled_error(
                     "Key does not exist in config",

src/commands/edit.rs

@@ -38,7 +38,7 @@ impl PerItemCommand for Edit {
         value: Value,
     ) -> Result<OutputStream, ShellError> {
         let value_tag = value.tag();
-        let field = call_info.args.expect_nth(0)?.as_column_path().unwrap();
+        let field = call_info.args.expect_nth(0)?.as_column_path()?;
         let replacement = call_info.args.expect_nth(1)?.tagged_unknown();
 
         let stream = match value {

src/commands/format.rs

@@ -37,9 +37,17 @@ impl PerItemCommand for Format {
         value: Value,
     ) -> Result<OutputStream, ShellError> {
         //let value_tag = value.tag();
-        let pattern = call_info.args.expect_nth(0)?.as_string().unwrap();
+        let pattern = call_info.args.expect_nth(0)?;
+        let pattern_tag = pattern.tag.clone();
+        let pattern = pattern.as_string()?;
 
-        let format_pattern = format(&pattern).unwrap();
+        let format_pattern = format(&pattern).map_err(|_| {
+            ShellError::labeled_error(
+                "Could not create format pattern",
+                "could not create format pattern",
+                pattern_tag,
+            )
+        })?;
         let commands = format_pattern.1;
 
         let output = if let Value {

src/commands/save.rs

@@ -178,7 +178,7 @@ fn save(
         let content : Result<Vec<u8>, ShellError> = 'scope: loop {
             break if !save_raw {
                 if let Some(extension) = full_path.extension() {
-                    let command_name = format!("to-{}", extension.to_str().unwrap());
+                    let command_name = format!("to-{}", extension.to_string_lossy());
                     if let Some(converter) = registry.get_command(&command_name) {
                         let new_args = RawCommandArgs {
                             host,

src/commands/table.rs

@@ -39,7 +39,12 @@ fn table(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream,
         let host = args.host.clone();
         let start_number = match args.get("start_number") {
             Some(Value { value: UntaggedValue::Primitive(Primitive::Int(i)), .. }) => {
-                i.to_usize().unwrap()
+                if let Some(num) = i.to_usize() {
+                    num
+                } else {
+                    yield Err(ShellError::labeled_error("Expected a row number", "expected a row number", &args.args.call_info.name_tag));
+                    0
+                }
             }
             _ => {
                 0