add --table_mode -m parameter (#5513)

* add `--table_mode` `-m` parameter

* underscores to dashes

crates/nu-cli/src/commands.rs

@@ -6,7 +6,7 @@ use nu_parser::parse;
 use nu_protocol::engine::Stack;
 use nu_protocol::{
     engine::{EngineState, StateDelta, StateWorkingSet},
-    PipelineData, Spanned,
+    PipelineData, Spanned, Value,
 };
 use std::path::Path;
 
@@ -17,6 +17,7 @@ pub fn evaluate_commands(
     stack: &mut Stack,
     input: PipelineData,
     is_perf_true: bool,
+    table_mode: Option<Value>,
 ) -> Result<()> {
     // Run a command (or commands) given to us by the user
     let (block, delta) = {
@@ -37,7 +38,10 @@ pub fn evaluate_commands(
         report_error(&working_set, &err);
     }
 
-    let config = engine_state.get_config().clone();
+    let mut config = engine_state.get_config().clone();
+    if let Some(t_mode) = table_mode {
+        config.table_mode = t_mode.as_string()?;
+    }
 
     // Merge the delta in case env vars changed in the config
     match nu_engine::env::current_dir(engine_state, stack) {
@@ -66,7 +70,7 @@ pub fn evaluate_commands(
 
     match eval_block(engine_state, stack, &block, input, false, false) {
         Ok(pipeline_data) => {
-            crate::eval_file::print_table_or_error(engine_state, stack, pipeline_data, &config)
+            crate::eval_file::print_table_or_error(engine_state, stack, pipeline_data, &mut config)
         }
         Err(err) => {
             let working_set = StateWorkingSet::new(engine_state);

crates/nu-cli/src/eval_file.rs

@@ -61,16 +61,19 @@ pub fn evaluate_file(
 }
 
 pub fn print_table_or_error(
-    engine_state: &EngineState,
+    engine_state: &mut EngineState,
     stack: &mut Stack,
     mut pipeline_data: PipelineData,
-    config: &Config,
+    config: &mut Config,
 ) {
     let exit_code = match &mut pipeline_data {
         PipelineData::ExternalStream { exit_code, .. } => exit_code.take(),
         _ => None,
     };
 
+    // Change the engine_state config to use the passed in configuration
+    engine_state.set_config(config);
+
     match engine_state.find_decl("table".as_bytes(), &[]) {
         Some(decl_id) => {
             let table = engine_state.get_decl(decl_id).run(