Add subcommands. Switch from-* and to-* to them (#1708)

crates/nu-cli/src/cli.rs

@@ -320,6 +320,7 @@ pub fn create_default_context(
             whole_stream_command(Histogram),
             whole_stream_command(Sum),
             // File format output
+            whole_stream_command(To),
             whole_stream_command(ToBSON),
             whole_stream_command(ToCSV),
             whole_stream_command(ToHTML),
@@ -332,6 +333,7 @@ pub fn create_default_context(
             whole_stream_command(ToURL),
             whole_stream_command(ToYAML),
             // File format input
+            whole_stream_command(From),
             whole_stream_command(FromCSV),
             whole_stream_command(FromEML),
             whole_stream_command(FromTSV),

crates/nu-cli/src/commands.rs

@@ -31,6 +31,7 @@ pub(crate) mod evaluate_by;
 pub(crate) mod exit;
 pub(crate) mod first;
 pub(crate) mod format;
+pub(crate) mod from;
 pub(crate) mod from_bson;
 pub(crate) mod from_csv;
 pub(crate) mod from_eml;
@@ -101,6 +102,7 @@ pub(crate) mod sum;
 pub(crate) mod t_sort_by;
 pub(crate) mod table;
 pub(crate) mod tags;
+pub(crate) mod to;
 pub(crate) mod to_bson;
 pub(crate) mod to_csv;
 pub(crate) mod to_html;
@@ -150,6 +152,7 @@ pub(crate) use evaluate_by::EvaluateBy;
 pub(crate) use exit::Exit;
 pub(crate) use first::First;
 pub(crate) use format::Format;
+pub(crate) use from::From;
 pub(crate) use from_bson::FromBSON;
 pub(crate) use from_csv::FromCSV;
 pub(crate) use from_eml::FromEML;
@@ -219,6 +222,7 @@ pub(crate) use sum::Sum;
 pub(crate) use t_sort_by::TSortBy;
 pub(crate) use table::Table;
 pub(crate) use tags::Tags;
+pub(crate) use to::To;
 pub(crate) use to_bson::ToBSON;
 pub(crate) use to_csv::ToCSV;
 pub(crate) use to_html::ToHTML;

crates/nu-cli/src/commands/classified/internal.rs

@@ -51,7 +51,7 @@ pub(crate) fn run_internal_command(
                     }
                     CommandAction::AutoConvert(tagged_contents, extension) => {
                         let contents_tag = tagged_contents.tag.clone();
-                        let command_name = format!("from-{}", extension);
+                        let command_name = format!("from {}", extension);
                         let command = command.clone();
                         if let Some(converter) = context.registry.get_command(&command_name) {
                             let new_args = RawCommandArgs {

crates/nu-cli/src/commands/command.rs

@@ -407,7 +407,7 @@ impl Command {
 
     pub fn run(&self, args: CommandArgs, registry: &CommandRegistry) -> OutputStream {
         if args.call_info.switch_present("help") {
-            get_help(self.name(), self.usage(), self.signature()).into()
+            get_help(self.name(), self.usage(), self.signature(), registry).into()
         } else {
             match self.0.run(args, registry) {
                 Ok(stream) => stream,

crates/nu-cli/src/commands/enter.rs

@@ -95,7 +95,7 @@ fn enter(
                     let tagged_contents = contents.into_value(&contents_tag);
 
                     if let Some(extension) = file_extension {
-                        let command_name = format!("from-{}", extension);
+                        let command_name = format!("from {}", extension);
                         if let Some(converter) =
                             registry.get_command(&command_name)
                         {

crates/nu-cli/src/commands/from.rs

@@ -0,0 +1,31 @@
+use crate::commands::WholeStreamCommand;
+use crate::prelude::*;
+use nu_errors::ShellError;
+use nu_protocol::Signature;
+
+pub struct From;
+
+impl WholeStreamCommand for From {
+    fn name(&self) -> &str {
+        "from"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("from")
+    }
+
+    fn usage(&self) -> &str {
+        "Parse content (string or binary) as a table."
+    }
+
+    fn run(
+        &self,
+        _args: CommandArgs,
+        registry: &CommandRegistry,
+    ) -> Result<OutputStream, ShellError> {
+        Ok(
+            crate::commands::help::get_help(self.name(), self.usage(), self.signature(), registry)
+                .into(),
+        )
+    }
+}

crates/nu-cli/src/commands/from_bson.rs

@@ -10,15 +10,15 @@ pub struct FromBSON;
 
 impl WholeStreamCommand for FromBSON {
     fn name(&self) -> &str {
-        "from-bson"
+        "from bson"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-bson")
+        Signature::build("from bson")
     }
 
     fn usage(&self) -> &str {
-        "Parse text as .bson and create table."
+        "Parse binary as .bson and create table."
     }
 
     fn run(

crates/nu-cli/src/commands/from_csv.rs

@@ -14,11 +14,11 @@ pub struct FromCSVArgs {
 
 impl WholeStreamCommand for FromCSV {
     fn name(&self) -> &str {
-        "from-csv"
+        "from csv"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-csv")
+        Signature::build("from csv")
             .named(
                 "separator",
                 SyntaxShape::String,

crates/nu-cli/src/commands/from_eml.rs

@@ -18,11 +18,11 @@ pub struct FromEMLArgs {
 
 impl WholeStreamCommand for FromEML {
     fn name(&self) -> &str {
-        "from-eml"
+        "from eml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-eml").named(
+        Signature::build("from eml").named(
             "preview-body",
             SyntaxShape::Int,
             "How many bytes of the body to preview",

crates/nu-cli/src/commands/from_ics.rs

@@ -11,11 +11,11 @@ pub struct FromIcs;
 
 impl WholeStreamCommand for FromIcs {
     fn name(&self) -> &str {
-        "from-ics"
+        "from ics"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-ics")
+        Signature::build("from ics")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_ini.rs

@@ -8,11 +8,11 @@ pub struct FromINI;
 
 impl WholeStreamCommand for FromINI {
     fn name(&self) -> &str {
-        "from-ini"
+        "from ini"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-ini")
+        Signature::build("from ini")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_json.rs

@@ -12,11 +12,11 @@ pub struct FromJSONArgs {
 
 impl WholeStreamCommand for FromJSON {
     fn name(&self) -> &str {
-        "from-json"
+        "from json"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-json").switch(
+        Signature::build("from json").switch(
             "objects",
             "treat each line as a separate value",
             Some('o'),

crates/nu-cli/src/commands/from_ods.rs

@@ -15,11 +15,11 @@ pub struct FromODSArgs {
 
 impl WholeStreamCommand for FromODS {
     fn name(&self) -> &str {
-        "from-ods"
+        "from ods"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-ods").switch(
+        Signature::build("from ods").switch(
             "headerless",
             "don't treat the first row as column names",
             None,

crates/nu-cli/src/commands/from_sqlite.rs

@@ -10,11 +10,11 @@ pub struct FromSQLite;
 
 impl WholeStreamCommand for FromSQLite {
     fn name(&self) -> &str {
-        "from-sqlite"
+        "from sqlite"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-sqlite")
+        Signature::build("from sqlite")
     }
 
     fn usage(&self) -> &str {
@@ -34,11 +34,11 @@ pub struct FromDB;
 
 impl WholeStreamCommand for FromDB {
     fn name(&self) -> &str {
-        "from-db"
+        "from db"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-db")
+        Signature::build("from db")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_ssv.rs

@@ -17,7 +17,7 @@ pub struct FromSSVArgs {
     minimum_spaces: Option<Tagged<usize>>,
 }
 
-const STRING_REPRESENTATION: &str = "from-ssv";
+const STRING_REPRESENTATION: &str = "from ssv";
 const DEFAULT_MINIMUM_SPACES: usize = 2;
 
 impl WholeStreamCommand for FromSSV {

crates/nu-cli/src/commands/from_toml.rs

@@ -7,11 +7,11 @@ pub struct FromTOML;
 
 impl WholeStreamCommand for FromTOML {
     fn name(&self) -> &str {
-        "from-toml"
+        "from toml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-toml")
+        Signature::build("from toml")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_tsv.rs

@@ -13,11 +13,11 @@ pub struct FromTSVArgs {
 
 impl WholeStreamCommand for FromTSV {
     fn name(&self) -> &str {
-        "from-tsv"
+        "from tsv"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-tsv").switch(
+        Signature::build("from tsv").switch(
             "headerless",
             "don't treat the first row as column names",
             None,

crates/nu-cli/src/commands/from_url.rs

@@ -7,11 +7,11 @@ pub struct FromURL;
 
 impl WholeStreamCommand for FromURL {
     fn name(&self) -> &str {
-        "from-url"
+        "from url"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-url")
+        Signature::build("from url")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_vcf.rs

@@ -11,11 +11,11 @@ pub struct FromVcf;
 
 impl WholeStreamCommand for FromVcf {
     fn name(&self) -> &str {
-        "from-vcf"
+        "from vcf"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-vcf")
+        Signature::build("from vcf")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_xlsx.rs

@@ -15,11 +15,11 @@ pub struct FromXLSXArgs {
 
 impl WholeStreamCommand for FromXLSX {
     fn name(&self) -> &str {
-        "from-xlsx"
+        "from xlsx"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-xlsx").switch(
+        Signature::build("from xlsx").switch(
             "headerless",
             "don't treat the first row as column names",
             None,

crates/nu-cli/src/commands/from_xml.rs

@@ -7,11 +7,11 @@ pub struct FromXML;
 
 impl WholeStreamCommand for FromXML {
     fn name(&self) -> &str {
-        "from-xml"
+        "from xml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-xml")
+        Signature::build("from xml")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/from_yaml.rs

@@ -7,11 +7,11 @@ pub struct FromYAML;
 
 impl WholeStreamCommand for FromYAML {
     fn name(&self) -> &str {
-        "from-yaml"
+        "from yaml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-yaml")
+        Signature::build("from yaml")
     }
 
     fn usage(&self) -> &str {
@@ -31,11 +31,11 @@ pub struct FromYML;
 
 impl WholeStreamCommand for FromYML {
     fn name(&self) -> &str {
-        "from-yml"
+        "from yml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("from-yml")
+        Signature::build("from yml")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/help.rs

@@ -14,7 +14,7 @@ pub struct Help;
 
 #[derive(Deserialize)]
 pub struct HelpArgs {
-    command: Option<Tagged<String>>,
+    rest: Vec<Tagged<String>>,
 }
 
 impl WholeStreamCommand for Help {
@@ -23,11 +23,7 @@ impl WholeStreamCommand for Help {
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("help").optional(
-            "command",
-            SyntaxShape::String,
-            "the name of command(s) to get help on",
-        )
+        Signature::build("help").rest(SyntaxShape::String, "the name of command to get help on")
     }
 
     fn usage(&self) -> &str {
@@ -44,15 +40,19 @@ impl WholeStreamCommand for Help {
 }
 
 fn help(
-    HelpArgs { command }: HelpArgs,
+    HelpArgs { rest }: HelpArgs,
     RunnableContext { registry, name, .. }: RunnableContext,
 ) -> Result<OutputStream, ShellError> {
-    if let Some(document) = command {
+    if let Some(document) = rest.get(0) {
         let mut help = VecDeque::new();
         if document.item == "commands" {
             let mut sorted_names = registry.names();
             sorted_names.sort();
             for cmd in sorted_names {
+                // If it's a subcommand, don't list it during the commands list
+                if cmd.contains(' ') {
+                    continue;
+                }
                 let mut short_desc = TaggedDictBuilder::new(name.clone());
                 let document_tag = document.tag.clone();
                 let value = command_dict(
@@ -82,13 +82,31 @@ fn help(
 
                 help.push_back(ReturnSuccess::value(short_desc.into_value()));
             }
+        } else if rest.len() == 2 {
+            // Check for a subcommand
+            let command_name = format!("{} {}", rest[0].item, rest[1].item);
+            if let Some(command) = registry.get_command(&command_name) {
+                return Ok(get_help(
+                    &command.name(),
+                    &command.usage(),
+                    command.signature(),
+                    &registry,
+                )
+                .into());
+            }
         } else if let Some(command) = registry.get_command(&document.item) {
-            return Ok(get_help(&command.name(), &command.usage(), command.signature()).into());
+            return Ok(get_help(
+                &command.name(),
+                &command.usage(),
+                command.signature(),
+                &registry,
+            )
+            .into());
         } else {
             return Err(ShellError::labeled_error(
                 "Can't find command (use 'help commands' for full list)",
                 "can't find command",
-                document.tag,
+                document.tag.span,
             ));
         }
         let help = futures::stream::iter(help);
@@ -128,6 +146,7 @@ pub(crate) fn get_help(
     cmd_name: &str,
     cmd_usage: &str,
     cmd_sig: Signature,
+    registry: &CommandRegistry,
 ) -> impl Into<OutputStream> {
     let mut help = VecDeque::new();
     let mut long_desc = String::new();
@@ -137,6 +156,15 @@ pub(crate) fn get_help(
 
     let signature = cmd_sig;
 
+    let mut subcommands = String::new();
+    for name in registry.names() {
+        if name.starts_with(&format!("{} ", cmd_name)) {
+            let subcommand = registry.get_command(&name).expect("This shouldn't happen");
+
+            subcommands.push_str(&format!("  {} - {}\n", name, subcommand.usage()));
+        }
+    }
+
     let mut one_liner = String::new();
     one_liner.push_str(&signature.name);
     one_liner.push_str(" ");
@@ -156,14 +184,23 @@ pub(crate) fn get_help(
         one_liner.push_str(" ...args");
     }
 
+    if !subcommands.is_empty() {
+        one_liner.push_str("<subcommand> ");
+    }
+
     if !signature.named.is_empty() {
         one_liner.push_str("{flags} ");
     }
 
     long_desc.push_str(&format!("\nUsage:\n  > {}\n", one_liner));
 
+    if !subcommands.is_empty() {
+        long_desc.push_str("\nSubcommands:\n");
+        long_desc.push_str(&subcommands);
+    }
+
     if !signature.positional.is_empty() || signature.rest_positional.is_some() {
-        long_desc.push_str("\nparameters:\n");
+        long_desc.push_str("\nParameters:\n");
         for positional in signature.positional {
             match positional.0 {
                 PositionalType::Mandatory(name, _m) => {
@@ -180,7 +217,7 @@ pub(crate) fn get_help(
         }
     }
     if !signature.named.is_empty() {
-        long_desc.push_str("\nflags:\n");
+        long_desc.push_str("\nFlags:\n");
         for (flag, ty) in signature.named {
             let msg = match ty.0 {
                 NamedType::Switch(s) => {

crates/nu-cli/src/commands/save.rs

@@ -221,7 +221,7 @@ fn save(
         let content : Result<Vec<u8>, ShellError> = 'scope: loop {
             break if !save_raw {
                 if let Some(extension) = full_path.extension() {
-                    let command_name = format!("to-{}", extension.to_string_lossy());
+                    let command_name = format!("to {}", extension.to_string_lossy());
                     if let Some(converter) = registry.get_command(&command_name) {
                         let new_args = RawCommandArgs {
                             host,

crates/nu-cli/src/commands/to.rs

@@ -0,0 +1,31 @@
+use crate::commands::WholeStreamCommand;
+use crate::prelude::*;
+use nu_errors::ShellError;
+use nu_protocol::Signature;
+
+pub struct To;
+
+impl WholeStreamCommand for To {
+    fn name(&self) -> &str {
+        "to"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("to")
+    }
+
+    fn usage(&self) -> &str {
+        "Convert table into an output format."
+    }
+
+    fn run(
+        &self,
+        _args: CommandArgs,
+        registry: &CommandRegistry,
+    ) -> Result<OutputStream, ShellError> {
+        Ok(
+            crate::commands::help::get_help(self.name(), self.usage(), self.signature(), registry)
+                .into(),
+        )
+    }
+}

crates/nu-cli/src/commands/to_bson.rs

@@ -12,11 +12,11 @@ pub struct ToBSON;
 
 impl WholeStreamCommand for ToBSON {
     fn name(&self) -> &str {
-        "to-bson"
+        "to bson"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-bson")
+        Signature::build("to bson")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_csv.rs

@@ -14,11 +14,11 @@ pub struct ToCSVArgs {
 
 impl WholeStreamCommand for ToCSV {
     fn name(&self) -> &str {
-        "to-csv"
+        "to csv"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-csv")
+        Signature::build("to csv")
             .named(
                 "separator",
                 SyntaxShape::String,

crates/nu-cli/src/commands/to_html.rs

@@ -10,11 +10,11 @@ pub struct ToHTML;
 
 impl WholeStreamCommand for ToHTML {
     fn name(&self) -> &str {
-        "to-html"
+        "to html"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-html")
+        Signature::build("to html")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_json.rs

@@ -7,11 +7,11 @@ pub struct ToJSON;
 
 impl WholeStreamCommand for ToJSON {
     fn name(&self) -> &str {
-        "to-json"
+        "to json"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-json")
+        Signature::build("to json")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_md.rs

@@ -9,11 +9,11 @@ pub struct ToMarkdown;
 
 impl WholeStreamCommand for ToMarkdown {
     fn name(&self) -> &str {
-        "to-md"
+        "to md"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-md")
+        Signature::build("to md")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_sqlite.rs

@@ -10,11 +10,11 @@ pub struct ToSQLite;
 
 impl WholeStreamCommand for ToSQLite {
     fn name(&self) -> &str {
-        "to-sqlite"
+        "to sqlite"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-sqlite")
+        Signature::build("to sqlite")
     }
 
     fn usage(&self) -> &str {
@@ -38,11 +38,11 @@ pub struct ToDB;
 
 impl WholeStreamCommand for ToDB {
     fn name(&self) -> &str {
-        "to-db"
+        "to db"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-db")
+        Signature::build("to db")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_toml.rs

@@ -7,11 +7,11 @@ pub struct ToTOML;
 
 impl WholeStreamCommand for ToTOML {
     fn name(&self) -> &str {
-        "to-toml"
+        "to toml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-toml")
+        Signature::build("to toml")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_tsv.rs

@@ -13,11 +13,11 @@ pub struct ToTSVArgs {
 
 impl WholeStreamCommand for ToTSV {
     fn name(&self) -> &str {
-        "to-tsv"
+        "to tsv"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-tsv").switch(
+        Signature::build("to tsv").switch(
             "headerless",
             "do not output the column names as the first row",
             None,

crates/nu-cli/src/commands/to_url.rs

@@ -7,11 +7,11 @@ pub struct ToURL;
 
 impl WholeStreamCommand for ToURL {
     fn name(&self) -> &str {
-        "to-url"
+        "to url"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-url")
+        Signature::build("to url")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/src/commands/to_yaml.rs

@@ -7,11 +7,11 @@ pub struct ToYAML;
 
 impl WholeStreamCommand for ToYAML {
     fn name(&self) -> &str {
-        "to-yaml"
+        "to yaml"
     }
 
     fn signature(&self) -> Signature {
-        Signature::build("to-yaml")
+        Signature::build("to yaml")
     }
 
     fn usage(&self) -> &str {

crates/nu-cli/tests/commands/alias.rs

@@ -8,7 +8,7 @@ fn alias_args_work() {
             cwd: dirs.root(),
             r#"
                 alias double_echo [a b] {echo $a $b}
-                double_echo 1 2 | to-json
+                double_echo 1 2 | to json
             "#
         );
 

crates/nu-cli/tests/commands/compact.rs

@@ -40,7 +40,7 @@ fn discards_empty_rows_by_default() {
             cwd: dirs.test(), pipeline(
             r#"
                 echo "[1,2,3,14,null]"
-                | from-json
+                | from json
                 | compact
                 | count
                 | echo $it

crates/nu-cli/tests/commands/drop.rs

@@ -4,7 +4,7 @@ use nu_test_support::nu;
 fn drop_rows() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        r#"echo '[{"foo": 3}, {"foo": 8}, {"foo": 4}]' | from-json | drop 2 | get foo | sum | echo $it"#
+        r#"echo '[{"foo": 3}, {"foo": 8}, {"foo": 4}]' | from json | drop 2 | get foo | sum | echo $it"#
     );
 
     assert_eq!(actual, "3");

crates/nu-cli/tests/commands/each.rs

@@ -5,7 +5,7 @@ fn each_works_separately() {
     let actual = nu!(
         cwd: "tests/fixtures/formats", pipeline(
         r#"
-        echo [1 2 3] | each { echo $it 10 | sum } | to-json | echo $it
+        echo [1 2 3] | each { echo $it 10 | sum } | to json | echo $it
         "#
     ));
 

crates/nu-cli/tests/commands/get.rs

@@ -240,7 +240,7 @@ fn errors_fetching_by_index_out_of_bounds() {
 fn quoted_column_access() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        r#"echo '[{"foo bar": {"baz": 4}}]' | from-json | get "foo bar".baz | echo $it"#
+        r#"echo '[{"foo bar": {"baz": 4}}]' | from json | get "foo bar".baz | echo $it"#
     );
 
     assert_eq!(actual, "4");

crates/nu-cli/tests/commands/headers.rs

@@ -9,7 +9,7 @@ fn headers_uses_first_row_as_header() {
             | get Sheet1
             | headers
             | get header0
-            | from-json"#
+            | from json"#
     ));
 
     assert_eq!(actual, "r1c0r2c0")
@@ -24,7 +24,7 @@ fn headers_adds_missing_column_name() {
             | get Sheet1
             | headers
             | get Column1
-            | from-json"#
+            | from json"#
     ));
 
     assert_eq!(actual, "r1c1r2c1")

crates/nu-cli/tests/commands/math.rs

@@ -125,7 +125,7 @@ fn compound_where() {
     let actual = nu!(
         cwd: "tests/fixtures/formats", pipeline(
         r#"
-            echo '[{"a": 1, "b": 1}, {"a": 2, "b": 1}, {"a": 2, "b": 2}]' | from-json | where a == 2 && b == 1 | to-json
+            echo '[{"a": 1, "b": 1}, {"a": 2, "b": 1}, {"a": 2, "b": 2}]' | from json | where a == 2 && b == 1 | to json
         "#
     ));
 
@@ -137,7 +137,7 @@ fn compound_where_paren() {
     let actual = nu!(
         cwd: "tests/fixtures/formats", pipeline(
         r#"
-            echo '[{"a": 1, "b": 1}, {"a": 2, "b": 1}, {"a": 2, "b": 2}]' | from-json | where (a == 2 && b == 1) || b == 2 | to-json
+            echo '[{"a": 1, "b": 1}, {"a": 2, "b": 1}, {"a": 2, "b": 2}]' | from json | where (a == 2 && b == 1) || b == 2 | to json
         "#
     ));
 

crates/nu-cli/tests/commands/uniq.rs

@@ -131,7 +131,7 @@ fn uniq_when_keys_out_of_order() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             echo '[{"a": "a", "b": [1,2,3]},{"b": [1,2,3], "a": "a"}]'
-            | from-json
+            | from json
             | uniq
             | count
             | echo $it

crates/nu-cli/tests/commands/where_.rs

@@ -14,7 +14,7 @@ fn filters_by_unit_size_comparison() {
 fn filters_with_nothing_comparison() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        r#"echo '[{"foo": 3}, {"foo": null}, {"foo": 4}]' | from-json | where foo > 1 | get foo | sum | echo $it"#
+        r#"echo '[{"foo": 3}, {"foo": null}, {"foo": 4}]' | from json | where foo > 1 | get foo | sum | echo $it"#
     );
 
     assert_eq!(actual, "7");
@@ -24,7 +24,7 @@ fn filters_with_nothing_comparison() {
 fn where_in_table() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        r#"echo '[{"name": "foo", "size": 3}, {"name": "foo", "size": 2}, {"name": "bar", "size": 4}]' | from-json | where name in: ["foo"] | get size | sum | echo $it"#
+        r#"echo '[{"name": "foo", "size": 3}, {"name": "foo", "size": 2}, {"name": "bar", "size": 4}]' | from json | where name in: ["foo"] | get size | sum | echo $it"#
     );
 
     assert_eq!(actual, "5");
@@ -34,7 +34,7 @@ fn where_in_table() {
 fn where_not_in_table() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        r#"echo '[{"name": "foo", "size": 3}, {"name": "foo", "size": 2}, {"name": "bar", "size": 4}]' | from-json | where name not-in: ["foo"] | get size | sum | echo $it"#
+        r#"echo '[{"name": "foo", "size": 3}, {"name": "foo", "size": 2}, {"name": "bar", "size": 4}]' | from json | where name not-in: ["foo"] | get size | sum | echo $it"#
     );
 
     assert_eq!(actual, "4");

crates/nu-cli/tests/commands/wrap.rs

@@ -19,7 +19,7 @@ fn wrap_rows_into_a_row() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_caballeros.txt
-                | from-csv
+                | from csv
                 | wrap caballeros
                 | get caballeros
                 | nth 0
@@ -49,7 +49,7 @@ fn wrap_rows_into_a_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_caballeros.txt
-                | from-csv
+                | from csv
                 | get last_name
                 | wrap caballero
                 | nth 2

crates/nu-cli/tests/format_conversions/bson.rs

@@ -6,8 +6,8 @@ fn table_to_bson_and_back_into_table() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.bson
-            | to-bson
-            | from-bson
+            | to bson
+            | from bson
             | get root
             | get 1.b
             | echo $it

crates/nu-cli/tests/format_conversions/csv.rs

@@ -6,7 +6,7 @@ use nu_test_support::{nu, pipeline};
 fn table_to_csv_text_and_from_csv_text_back_into_table() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        "open caco3_plastics.csv | to-csv | from-csv | first 1 | get origin | echo $it"
+        "open caco3_plastics.csv | to csv | from csv | first 1 | get origin | echo $it"
     );
 
     assert_eq!(actual, "SPAIN");
@@ -32,7 +32,7 @@ fn table_to_csv_text() {
                 | trim
                 | split-column "," a b c d origin
                 | last 1
-                | to-csv
+                | to csv
                 | lines
                 | nth 1
                 | echo $it
@@ -63,7 +63,7 @@ fn table_to_csv_text_skipping_headers_after_conversion() {
                 | trim
                 | split-column "," a b c d origin
                 | last 1
-                | to-csv --headerless
+                | to csv --headerless
                 | echo $it
             "#
         ));
@@ -117,7 +117,7 @@ fn from_csv_text_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_caballeros.txt
-                | from-csv
+                | from csv
                 | get rusty_luck
                 | count
                 | echo $it
@@ -145,7 +145,7 @@ fn from_csv_text_with_separator_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_caballeros.txt
-                | from-csv --separator ';'
+                | from csv --separator ';'
                 | get rusty_luck
                 | count
                 | echo $it
@@ -173,7 +173,7 @@ fn from_csv_text_with_tab_separator_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_caballeros.txt
-                | from-csv --separator '\t'
+                | from csv --separator '\t'
                 | get rusty_luck
                 | count
                 | echo $it
@@ -200,7 +200,7 @@ fn from_csv_text_skipping_headers_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_amigos.txt
-                | from-csv --headerless
+                | from csv --headerless
                 | get Column3
                 | count
                 | echo $it

crates/nu-cli/tests/format_conversions/html.rs

@@ -5,7 +5,7 @@ fn out_html_simple() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-            echo 3 | to-html
+            echo 3 | to html
         "#
     ));
 
@@ -17,7 +17,7 @@ fn out_html_table() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-            echo '{"name": "jason"}' | from-json | to-html
+            echo '{"name": "jason"}' | from json | to html
         "#
     ));
 

crates/nu-cli/tests/format_conversions/ics.rs

@@ -86,7 +86,7 @@ fn from_ics_text_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open calendar.txt
-                | from-ics
+                | from ics
                 | get events
                 | get properties
                 | where name == "SUMMARY"

crates/nu-cli/tests/format_conversions/json.rs

@@ -8,8 +8,8 @@ fn table_to_json_text_and_from_json_text_back_into_table() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sgml_description.json
-            | to-json
-            | from-json
+            | to json
+            | from json
             | get glossary.GlossDiv.GlossList.GlossEntry.GlossSee
             | echo $it
         "#
@@ -37,7 +37,7 @@ fn from_json_text_to_table() {
 
         let actual = nu!(
             cwd: dirs.test(),
-            "open katz.txt | from-json | get katz | get rusty_luck | count | echo $it"
+            "open katz.txt | from json | get katz | get rusty_luck | count | echo $it"
         );
 
         assert_eq!(actual, "4");
@@ -61,7 +61,7 @@ fn from_json_text_recognizing_objects_independently_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open katz.txt
-                | from-json -o
+                | from json -o
                 | where name == "GorbyPuff"
                 | get rusty_luck
                 | echo $it
@@ -90,8 +90,8 @@ fn table_to_json_text() {
                 | lines
                 | split-column "," name luck
                 | pick name
-                | to-json
-                | from-json
+                | to json
+                | from json
                 | nth 0
                 | get name
                 | echo $it

crates/nu-cli/tests/format_conversions/markdown.rs

@@ -5,7 +5,7 @@ fn out_md_simple() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-            echo 3 | to-md
+            echo 3 | to md
         "#
     ));
 
@@ -17,7 +17,7 @@ fn out_md_table() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-            echo '{"name": "jason"}' | from-json | to-md
+            echo '{"name": "jason"}' | from json | to md
         "#
     ));
 

crates/nu-cli/tests/format_conversions/sqlite.rs

@@ -6,8 +6,8 @@ fn table_to_sqlite_and_back_into_table() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             open sample.db
-            | to-sqlite
-            | from-sqlite
+            | to sqlite
+            | from sqlite
             | get table_values
             | nth 2
             | get x

crates/nu-cli/tests/format_conversions/ssv.rs

@@ -19,7 +19,7 @@ fn from_ssv_text_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open oc_get_svc.txt
-                | from-ssv
+                | from ssv
                 | nth 0
                 | get IP
                 | echo $it
@@ -47,7 +47,7 @@ fn from_ssv_text_to_table_with_separator_specified() {
             cwd: dirs.test(), pipeline(
             r#"
                 open oc_get_svc.txt
-                | from-ssv --minimum-spaces 3
+                | from ssv --minimum-spaces 3
                 | nth 0
                 | get IP
                 | echo $it
@@ -74,7 +74,7 @@ fn from_ssv_text_treating_first_line_as_data_with_flag() {
         cwd: dirs.test(), pipeline(
             r#"
                 open oc_get_svc.txt
-                | from-ssv --headerless -a
+                | from ssv --headerless -a
                 | first
                 | get Column1
                 | echo $it
@@ -85,7 +85,7 @@ fn from_ssv_text_treating_first_line_as_data_with_flag() {
             cwd: dirs.test(), pipeline(
             r#"
                 open oc_get_svc.txt
-                | from-ssv --headerless
+                | from ssv --headerless
                 | first
                 | get Column1
                 | echo $it

crates/nu-cli/tests/format_conversions/toml.rs

@@ -6,8 +6,8 @@ fn table_to_toml_text_and_from_toml_text_back_into_table() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             open cargo_sample.toml
-            | to-toml
-            | from-toml
+            | to toml
+            | from toml
             | get package.name
             | echo $it
         "#

crates/nu-cli/tests/format_conversions/tsv.rs

@@ -6,7 +6,7 @@ use nu_test_support::{nu, pipeline};
 fn table_to_tsv_text_and_from_tsv_text_back_into_table() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        "open caco3_plastics.tsv | to-tsv | from-tsv | first 1 | get origin | echo $it"
+        "open caco3_plastics.tsv | to tsv | from tsv | first 1 | get origin | echo $it"
     );
 
     assert_eq!(actual, "SPAIN");
@@ -16,7 +16,7 @@ fn table_to_tsv_text_and_from_tsv_text_back_into_table() {
 fn table_to_tsv_text_and_from_tsv_text_back_into_table_using_csv_separator() {
     let actual = nu!(
         cwd: "tests/fixtures/formats",
-        r"open caco3_plastics.tsv | to-tsv | from-csv --separator '\t' | first 1 | get origin | echo $it"
+        r"open caco3_plastics.tsv | to tsv | from csv --separator '\t' | first 1 | get origin | echo $it"
     );
 
     assert_eq!(actual, "SPAIN");
@@ -41,7 +41,7 @@ fn table_to_tsv_text() {
                 | lines
                 | split-column "\t" a b c d origin
                 | last 1
-                | to-tsv
+                | to tsv
                 | lines
                 | nth 1
                 | echo $it
@@ -71,7 +71,7 @@ fn table_to_tsv_text_skipping_headers_after_conversion() {
                 | lines
                 | split-column "\t" a b c d origin
                 | last 1
-                | to-tsv --headerless
+                | to tsv --headerless
                 | echo $it
             "#
         ));
@@ -97,7 +97,7 @@ fn from_tsv_text_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_amigos.txt
-                | from-tsv
+                | from tsv
                 | get rusty_luck
                 | count
                 | echo $it
@@ -124,7 +124,7 @@ fn from_tsv_text_skipping_headers_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open los_tres_amigos.txt
-                | from-tsv --headerless
+                | from tsv --headerless
                 | get Column3
                 | count
                 | echo $it

crates/nu-cli/tests/format_conversions/url.rs

@@ -6,8 +6,8 @@ fn can_encode_and_decode_urlencoding() {
         cwd: "tests/fixtures/formats", pipeline(
             r#"
                 open sample.url
-                | to-url
-                | from-url
+                | to url
+                | from url
                 | get cheese
                 | echo $it
             "#

crates/nu-cli/tests/format_conversions/vcf.rs

@@ -70,7 +70,7 @@ fn from_vcf_text_to_table() {
             cwd: dirs.test(), pipeline(
             r#"
                 open contacts.txt
-                | from-vcf
+                | from vcf
                 | get properties
                 | where name == "EMAIL"
                 | first

crates/nu-cli/tests/format_conversions/yaml.rs

@@ -6,8 +6,8 @@ fn table_to_yaml_text_and_from_yaml_text_back_into_table() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             open appveyor.yml
-            | to-yaml
-            | from-yaml
+            | to yaml
+            | from yaml
             | get environment.global.PROJECT_NAME
             | echo $it
         "#

crates/nu-parser/src/parse.rs

@@ -848,16 +848,22 @@ fn parse_internal_command(
     lite_cmd: &LiteCommand,
     registry: &dyn SignatureRegistry,
     signature: &Signature,
+    mut idx: usize,
 ) -> (InternalCommand, Option<ParseError>) {
     // This is a known internal command, so we need to work with the arguments and parse them according to the expected types
-    let mut internal_command = InternalCommand::new(
-        lite_cmd.name.item.clone(),
-        lite_cmd.name.span,
-        lite_cmd.span(),
-    );
+
+    let (name, name_span) = if idx == 0 {
+        (lite_cmd.name.item.clone(), lite_cmd.name.span)
+    } else {
+        (
+            format!("{} {}", lite_cmd.name.item, lite_cmd.args[0].item),
+            Span::new(lite_cmd.name.span.start(), lite_cmd.args[0].span.end()),
+        )
+    };
+
+    let mut internal_command = InternalCommand::new(name, name_span, lite_cmd.span());
     internal_command.args.set_initial_flags(&signature);
 
-    let mut idx = 0;
     let mut current_positional = 0;
     let mut named = NamedArguments::new();
     let mut positional = vec![];
@@ -1051,12 +1057,31 @@ fn classify_pipeline(
                 garbage(lite_cmd.span())
             };
             commands.push(ClassifiedCommand::Expr(Box::new(expr)))
-        } else if let Some(signature) = registry.get(&lite_cmd.name.item) {
-            let (internal_command, err) = parse_internal_command(&lite_cmd, registry, &signature);
+        } else {
+            if !lite_cmd.args.is_empty() {
+                // Check if it's a sub-command
+                if let Some(signature) =
+                    registry.get(&format!("{} {}", lite_cmd.name.item, lite_cmd.args[0].item))
+                {
+                    let (internal_command, err) =
+                        parse_internal_command(&lite_cmd, registry, &signature, 1);
 
                     error = error.or(err);
-            commands.push(ClassifiedCommand::Internal(internal_command))
-        } else {
+                    commands.push(ClassifiedCommand::Internal(internal_command));
+                    continue;
+                }
+            }
+
+            // Check if it's an internal command
+            if let Some(signature) = registry.get(&lite_cmd.name.item) {
+                let (internal_command, err) =
+                    parse_internal_command(&lite_cmd, registry, &signature, 0);
+
+                error = error.or(err);
+                commands.push(ClassifiedCommand::Internal(internal_command));
+                continue;
+            }
+
             let name = lite_cmd.name.clone().map(|v| {
                 let trimmed = trim_quotes(&v);
                 expand_path(&trimmed).to_string()

crates/nu-protocol/src/hir.rs

@@ -33,10 +33,13 @@ pub struct InternalCommand {
 impl InternalCommand {
     pub fn new(name: String, name_span: Span, full_span: Span) -> InternalCommand {
         InternalCommand {
-            name: name.clone(),
+            name,
             name_span,
             args: crate::hir::Call::new(
-                Box::new(SpannedExpression::new(Expression::string(name), name_span)),
+                Box::new(SpannedExpression::new(
+                    Expression::Command(name_span),
+                    name_span,
+                )),
                 full_span,
             ),
         }

docs/commands/save.md

@@ -21,10 +21,10 @@ You can save the name of files in a directory like this:
 > ls | where type == File | pick name | save filenames.csv
 ```
 
-Or you can format it in supported formats using one of the `to-*` commands:
+Or you can format it in supported formats using one of the `to` commands:
 
 ```shell
-> ls | where type == File | pick name | to-csv | save filenames
+> ls | where type == File | pick name | to csv | save filenames
 ```
 
 `filename.csv` and `filenames` are both `csv` formatted files. Nu auto-converts the format if a supported file extension is given.

tests/plugins/core_str.rs

@@ -119,7 +119,7 @@ fn converts_to_int() {
         cwd: "tests/fixtures/formats", pipeline(
         r#"
             echo '{number_as_string: "1"}'
-            | from-json
+            | from json
             | str number_as_string --to-int
             | rename number
             | where number == 1

tests/shell/pipeline/commands/external.rs

@@ -48,13 +48,6 @@ fn automatically_change_directory_with_trailing_slash_and_same_name_as_command()
     })
 }
 
-// #[test]
-// fn correctly_escape_external_arguments() {
-//     let actual = nu!(cwd: ".", r#"^echo '[{"foo": "bar"}]' | from-json | to-json"#);
-
-//     assert_eq!(actual, "{\"foo\":\"bar\"}");
-// }
-
 #[test]
 fn correctly_escape_external_arguments() {
     let actual = nu!(cwd: ".", r#"^echo '$0'"#);

tests/shell/pipeline/commands/internal.rs

@@ -152,7 +152,7 @@ mod tilde_expansion {
             let actual = nu!(
                 cwd: dirs.test(), pipeline(
                 r#"
-                    ls | sort-by name | group-by type | each { get File.name | echo $it } | to-json
+                    ls | sort-by name | group-by type | each { get File.name | echo $it } | to json
                 "#
             ));