[stdlib-candidate] Clean up file bulk-rename a little (#798)

[Generated diff](https://www.diffnow.com/report/xmq4f) for command
because move broke it.

- No `file` prefix similar to other [filesystem
commands](https://www.nushell.sh/commands/categories/filesystem.html)
- Input paths instead of directory param for filters or globbing
- Record closure param with original path (`$in` is still stem)
- `--verbose` table output
- `--no-exectute` for dry run with `--verbose`
- Shorthand flags
- Parallel renaming for large directories
- More tests

@amtoine Request feedback 🙏🏼 Happy to revise ot revert anything!

```console
❯ bulk-rename -h
Rename bulk input files in parallel using a closure.

The reason behind this command is quite simple:
- Sometimes one receives a bunch of files with integer ids: 1, 2, 3, ...
- These ids come rarely with padding... i.e. 1 instead of 001 when there are 3-digit ids
- This means that file with id 9 will be sorted way after file with id 1000

This command allows to do such a task!

Examples:
  Rename `.mise.toml` files to `.mise.local.toml` recursively
  > glob **/.mise.toml | bulk-rename { str append .local }

  Rename files in `/foo` with a name that has an id to have 3 digits with 0-padding
  > ls /foo | bulk-rename { |path|
     if $path.input.type == file {
       $path.stem | parse "some_format_{id}"
         | get 0
         | update id { fill --alignment r --character 0 --width 3 }
         | $"some_format_($in.id)"
     }
     # else skip dirs
   }

Usage:
  > main {flags} <update_stem>

Flags:
  -v, --verbose - Show which files were renamed, if any
  -n, --no-execute - Do not make any changes; add --verbose to see what would be made
whitespace bug: nushell/nushell#12264
  -h, --help - Display the help message for this command

Parameters:
  update_stem <closure()>: The code to rename the file stem: receives the old stem as input and a record param with both `stem` and `input` keys

Input/output types:
  ╭───┬───────────┬─────────────────────────────────╮
  │ # │   input   │             output              │
  ├───┼───────────┼─────────────────────────────────┤
  │ 0 │ list<any> │ nothing                         │
  │ 1 │ list<any> │ table<old: string, new: string> │
  ╰───┴───────────┴─────────────────────────────────╯
```

stdlib-candidate/std-rfc/bulk-rename.nu

@@ -0,0 +1,49 @@
+# Rename bulk input files in parallel using a closure.
+#
+# The reason behind this command is quite simple:
+# - Sometimes one receives a bunch of files with integer ids: 1, 2, 3, ...
+# - These ids come rarely with padding... i.e. 1 instead of 001 when there are 3-digit ids
+# - This means that file with id 9 will be sorted way after file with id 1000
+#
+# This command allows to do such a task!
+#
+# Examples:
+#   Rename `.mise.toml` files to `.mise.local.toml` recursively
+#   > glob **/.mise.toml | bulk-rename { str append .local }
+#
+#   Rename files in `/foo` with a name that has an id to have 3 digits with 0-padding
+#   > ls /foo | bulk-rename { |path|
+#      if $path.input.type == file {
+#        $path.stem | parse "some_format_{id}"
+#          | get 0
+#          | update id { fill --alignment r --character 0 --width 3 }
+#          | $"some_format_($in.id)"
+#      }
+#      # else skip dirs
+#    }
+export def main [
+    update_stem: closure, # The code to rename the file stem: receives the old stem as input and a record param with both `stem` and `input` keys
+    --verbose (-v), # Show which files were renamed, if any
+    --no-execute (-n) # Do not make any changes; add --verbose to see what would be made
+]: [list<any> -> nothing, list<any> -> table<old: path new: path>] {
+    let renamed = par-each --keep-order { |input|
+        let update_or_keep_stem = { |parts|
+            do $update_stem { stem: $in input: $input } | default $parts.stem
+        }
+        let old = if ($input | describe) == string {
+            $input
+        } else {
+            $input.name # convenience for ls
+        }
+        let new = $old | path parse | update stem $update_or_keep_stem | path join
+        if $new != $old {
+            if not $no_execute {
+                mv --force --verbose=$verbose $old $new
+            }
+            { old: $old new: $new }
+        }
+    }
+    if $verbose {
+        $renamed
+    }
+}

stdlib-candidate/std-rfc/mod.nu

@@ -2,5 +2,5 @@
 export module record/
 export module str/
 # commands
-export use fs.nu *
+export use bulk-rename.nu *
 export use set-env.nu *

stdlib-candidate/tests/bulk-rename.nu

@@ -0,0 +1,95 @@
+use std assert
+use ../std-rfc 'bulk-rename'
+
+const fixture = [
+    .gitignore
+    Cargo.toml
+    LICENSE
+    README.md
+    src
+    test.nu
+]
+
+export def 'test ls' [] {
+    let expects = [
+        .gitignore # hidden by ls
+        _Cargo.toml
+        _LICENSE
+        _README.md
+        _src
+        _test.nu
+    ]
+    test $expects {
+        ls $in | bulk-rename { '_' + $in }
+    }
+}
+
+export def 'test --no-execute' [] {
+    test $fixture {
+        ls $in | bulk-rename --no-execute { '_' + $in }
+    }
+}
+
+export def 'test --verbose' [] {
+    let expects = [
+        # .gitignore unchanged
+        _Cargo.toml
+        _LICENSE
+        _README.md
+        _src
+        _test.nu
+    ]
+    let renamed = test $fixture {
+        ls $in | bulk-rename --verbose --no-execute { '_' + $in }
+    }
+    assert equal ($renamed.new | each { path basename }) $expects
+}
+
+export def 'test skip-extensions' [] {
+    let expects = [
+        .gitignore
+        Cargo.toml
+        LICENSE.txt # changed
+        README.md
+        src.txt # changed
+        test.nu
+    ]
+    test $expects {
+        ls $in | bulk-rename { |path|
+            if $path.input.name ends-with $path.stem {
+                $path.stem + .txt
+            }
+        }
+    }
+}
+
+export def 'test glob' [] {
+    let expects = [
+        LICENSE # skipped
+        _.gitignore
+        _Cargo.toml
+        _README.md
+        _test.nu
+        src # skipped
+    ]
+    test $expects {
+        glob ($in | path join *.*) | bulk-rename { '_' + $in }
+    }
+}
+
+def test [expects: list<string> command: closure] {
+    let test_dir = $nu.temp-path | path join (random uuid)
+    def actual-files [] {
+        ls --all --short-names $test_dir | get name | sort
+    }
+    # before
+    mkdir $test_dir
+    $fixture | each { |name| touch ($test_dir | path join $name) }
+    assert equal (actual-files) $fixture
+    # test
+    let renamed = $test_dir | do $command
+    assert equal (actual-files) $expects
+    # after
+    rm --recursive --force $test_dir
+    $renamed
+}

stdlib-candidate/tests/mod.nu

@@ -1,3 +1,3 @@
-export module fs.nu
+export module bulk-rename.nu
 export module record.nu
 export module str_xpend.nu