Update docs for sys deprecation in 0.94.0 (#1387)

* Update docs for `sys` deprecation

* Add `null` return

* Restore old examples

* Rework structured data examples

* Restore make_docs.nu

book/coming_from_bash.md

@@ -49,7 +49,7 @@ Note: this table assumes Nu 0.91.0 or later.
 | `command1 && command2` | `command1; command2` | Run a command, and if it's successful run a second |
 | `stat $(which git)` | `stat (which git).path` | Use command output as argument for other command |
 | `echo /tmp/$RANDOM` | `$"/tmp/(random integer)"` | Use command output in a string |
-| `cargo b --jobs=$(nproc)` | `cargo b $"--jobs=(sys \| get cpu \| length)"` | Use command output in an option |
+| `cargo b --jobs=$(nproc)` | `cargo b $"--jobs=(sys cpu \| length)"`  | Use command output in an option |
 | `echo $PATH` | `$env.PATH` (Non-Windows) or `$env.Path` (Windows) | See the current path |
 | `<update ~/.bashrc>` | `vim $nu.config-path` | Update PATH permanently |
 | `export PATH = $PATH:/usr/other/bin` | `$env.PATH = ($env.PATH \| append /usr/other/bin)` | Update PATH temporarily |

book/nushell_map.md

@@ -2,7 +2,7 @@
 
 The idea behind this table is to help you understand how Nu builtins and plugins relate to other known shells and domain specific languages. We've tried to produce a map of relevant Nu commands and what their equivalents are in other languages. Contributions are welcome.
 
-Note: this table assumes Nu 0.43 or later.
+Note: this table assumes Nu 0.94 or later.
 
 
 | Nushell | SQL | .Net LINQ (C#) | PowerShell (without external modules) | Bash |
@@ -59,7 +59,9 @@ Note: this table assumes Nu 0.43 or later.
 | str join | concat_ws | Join | Join-String | |
 | str trim | rtrim, ltrim | Trim, TrimStart, TrimEnd | Trim | |
 | sum | sum | Sum | Measure-Object, measure | |
-| sys | | | Get-ComputerInfo | uname, lshw, lsblk, lscpu, lsusb, hdparam, free |
+| sys host | | | Get-ComputerInfo | uname |
+| sys disks | | | Get-ComputerInfo | lsblk |
+| sys mem | | | Get-ComputerInfo | free |
 | table | | | Format-Table, ft, Format-List, fl | |
 | take | top, limit | Take | Select-Object -First | head |
 | take until | | TakeWhile | | |

book/nushell_map_imperative.md

@@ -16,7 +16,7 @@ Note: this table assumes Nu 0.43 or later.
 | du | shutil.disk_usage | | | |
 | each | for | for | for | for |
 | exit | exit | System.exit, kotlin.system.exitProcess | exit | exit |
-| http get | urllib.request.urlopen | | | | 
+| http get | urllib.request.urlopen | | | |
 | first | list[:x] | List[0], peek | vector[0], top | Vec[0] |
 | format | format | format | format | format! |
 | from | csv, json, sqlite3 | | | |
@@ -32,7 +32,7 @@ Note: this table assumes Nu 0.43 or later.
 | kill | os.kill | | | |
 | last | list[-x:] | | | &Vec[Vec.len()-1] |
 | lines | split, splitlines | split | views::split | split, split_whitespace, rsplit, lines |
-| ls | os.listdir | | | fs::read_dir | 
+| ls | os.listdir | | | fs::read_dir |
 | match | match | when | | match |
 | merge | dict.append | | | map.extend |
 | mkdir | os.mkdir | | | fs::create_dir |
@@ -57,20 +57,19 @@ Note: this table assumes Nu 0.43 or later.
 | size | len | | | len |
 | skip | list[x:] | | | &Vec[x..],skip |
 | skip until | itertools.dropwhile | | | |
-| skip while | itertools.dropwhile | | | skip_while | 
+| skip while | itertools.dropwhile | | | skip_while |
 | sort-by | sorted, list.sort | sortedBy, sortedWith, Arrays.sort, Collections.sort | sort | sort |
 | split row | str.split{,lines}, re.split | split | views::split | split |
 | str | str functions | String functions | string functions | &str, String functions |
 | str join | str.join | joinToString | | join |
 | str trim | strip, rstrip, lstrip | trim, trimStart, trimEnd | regex | trim, trim*{start,end}, strip*{suffix,prefix} |
 | sum | sum | sum | reduce | sum |
-| sys | sys | | | |
 | to | import csv, json, sqlite3 | | | |
 | touch | open(path, 'a').close() | | | |
 | uniq | set | Set | set | HashSet |
 | upsert | dict[\"key\"] = val | | | |
 | version | sys.version, sys.version_info | | | |
 | with-env | os.environ | | | |
-| where | filter | filter | filter | filter | 
+| where | filter | filter | filter | filter |
 | which | shutil.which | | | |
 | wrap | { "key" : val } | | | |

book/operators.md

@@ -213,7 +213,7 @@ operator. You can use the spread multiple records inside a single record literal
  ...$config,
  users: [alice bob],
  ...{ url: example.com },
- ...(sys | get mem)
+ ...(sys mem)
  }
 ╭────────────┬───────────────╮
 │ path │ /tmp │