Remove preview.rs (#7555)

Leftover from `explore` development

Closes https://github.com/nushell/nushell/issues/7553

crates/nu-explore/src/commands/preview.rs

@@ -1,79 +0,0 @@
-use nu_protocol::{
-    engine::{EngineState, Stack},
-    Value,
-};
-use std::io::Result;
-
-use crate::{
-    nu_common::{self, collect_input},
-    views::Preview,
-};
-
-use super::{HelpManual, ViewCommand};
-
-#[derive(Default, Clone)]
-pub struct PreviewCmd;
-
-impl PreviewCmd {
-    pub fn new() -> Self {
-        Self
-    }
-}
-
-impl PreviewCmd {
-    pub const NAME: &'static str = "preview";
-}
-
-impl ViewCommand for PreviewCmd {
-    type View = Preview;
-
-    fn name(&self) -> &'static str {
-        Self::NAME
-    }
-
-    fn usage(&self) -> &'static str {
-        ""
-    }
-
-    fn help(&self) -> Option<HelpManual> {
-        Some(HelpManual {
-            name: "preview",
-            description:
-                "View the currently selected cell's data using the `table` Nushell command",
-            arguments: vec![],
-            examples: vec![],
-        })
-    }
-
-    fn parse(&mut self, _: &str) -> Result<()> {
-        Ok(())
-    }
-
-    fn spawn(
-        &mut self,
-        engine_state: &EngineState,
-        stack: &mut Stack,
-        value: Option<Value>,
-    ) -> Result<Self::View> {
-        let value = match value {
-            Some(value) => {
-                let (cols, vals) = collect_input(value.clone());
-
-                let has_no_head = cols.is_empty() || (cols.len() == 1 && cols[0].is_empty());
-                let has_single_value = vals.len() == 1 && vals[0].len() == 1;
-                if !has_no_head && has_single_value {
-                    let config = engine_state.get_config();
-                    vals[0][0].into_abbreviated_string(config)
-                } else {
-                    let ctrlc = engine_state.ctrlc.clone();
-                    let config = engine_state.get_config();
-
-                    nu_common::try_build_table(engine_state, stack, ctrlc, config, value)
-                }
-            }
-            None => String::new(),
-        };
-
-        Ok(Preview::new(&value))
-    }
-}