nu-cli refactor moving commands into their own crate nu-command (#2910)

* move commands, futures.rs, script.rs, utils

* move over maybe_print_errors

* add nu_command crate references to nu_cli

* in commands.rs open up to pub mod from pub(crate)

* nu-cli, nu-command, and nu tests are now passing

* cargo fmt

* clean up nu-cli/src/prelude.rs

* code cleanup

* for some reason lex.rs was not formatted, may be causing my error

* remove mod completion from lib.rs which was not being used along with quickcheck macros

* add in allow unused imports

* comment out one failing external test; comment out one failing internal test

* revert commenting out failing tests; something else might be going on; someone with a windows machine should check and see what is going on with these failing windows tests

* Update Cargo.toml

Extend the optional features to nu-command

Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>

crates/nu-command/tests/commands/every.rs

@@ -0,0 +1,209 @@
+use nu_test_support::fs::Stub::EmptyFile;
+use nu_test_support::playground::Playground;
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn gets_all_rows_by_every_zero() {
+    Playground::setup("every_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 0
+                | to json
+            "#
+        ));
+
+        assert_eq!(
+            actual.out,
+            r#"["amigos.txt","arepas.clu","los.txt","tres.txt"]"#
+        );
+    })
+}
+
+#[test]
+fn gets_no_rows_by_every_skip_zero() {
+    Playground::setup("every_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 0 --skip
+                | to json
+            "#
+        ));
+
+        assert_eq!(actual.out, "");
+    })
+}
+
+#[test]
+fn gets_all_rows_by_every_one() {
+    Playground::setup("every_test_3", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 1
+                | to json
+            "#
+        ));
+
+        assert_eq!(
+            actual.out,
+            r#"["amigos.txt","arepas.clu","los.txt","tres.txt"]"#
+        );
+    })
+}
+
+#[test]
+fn gets_no_rows_by_every_skip_one() {
+    Playground::setup("every_test_4", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 1 --skip
+                | to json
+            "#
+        ));
+
+        assert_eq!(actual.out, "");
+    })
+}
+
+#[test]
+fn gets_first_row_by_every_too_much() {
+    Playground::setup("every_test_5", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 999
+            "#
+        ));
+
+        let expected = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                echo [ amigos.txt ]
+            "#
+        ));
+
+        assert_eq!(actual.out, expected.out);
+    })
+}
+
+#[test]
+fn gets_all_rows_except_first_by_every_skip_too_much() {
+    Playground::setup("every_test_6", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 999 --skip
+                | to json
+            "#
+        ));
+
+        assert_eq!(actual.out, r#"["arepas.clu","los.txt","tres.txt"]"#);
+    })
+}
+
+#[test]
+fn gets_every_third_row() {
+    Playground::setup("every_test_7", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("quatro.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 3
+                | to json
+            "#
+        ));
+
+        assert_eq!(actual.out, r#"["amigos.txt","quatro.txt"]"#);
+    })
+}
+
+#[test]
+fn skips_every_third_row() {
+    Playground::setup("every_test_8", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("amigos.txt"),
+            EmptyFile("arepas.clu"),
+            EmptyFile("los.txt"),
+            EmptyFile("quatro.txt"),
+            EmptyFile("tres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | get name
+                | every 3 --skip
+                | to json
+            "#
+        ));
+
+        assert_eq!(actual.out, r#"["arepas.clu","los.txt","tres.txt"]"#);
+    })
+}