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3b1d405b96
# Description `Value` describes the types of first-class values that users and scripts can create, manipulate, pass around, and store. However, `Block`s are not first-class values in the language, so this PR removes it from `Value`. This removes some unnecessary code, and this change should be invisible to the user except for the change to `scope modules` described below. # User-Facing Changes Breaking change: the output of `scope modules` was changed so that `env_block` is now `has_env_block` which is a boolean value instead of a `Block`. # After Submitting Update the language guide possibly.
234 lines
11 KiB
Rust
234 lines
11 KiB
Rust
use nu_engine::command_prelude::*;
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use nu_protocol::Config;
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use std::fmt::Write;
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#[derive(Clone)]
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pub struct ViewSource;
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impl Command for ViewSource {
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fn name(&self) -> &str {
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"view source"
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}
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fn usage(&self) -> &str {
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"View a block, module, or a definition."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("view source")
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.input_output_types(vec![(Type::Nothing, Type::String)])
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.required("item", SyntaxShape::Any, "Name or block to view.")
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.category(Category::Debug)
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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_input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let arg: Value = call.req(engine_state, stack, 0)?;
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let arg_span = arg.span();
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match arg {
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Value::String { val, .. } => {
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if let Some(decl_id) = engine_state.find_decl(val.as_bytes(), &[]) {
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// arg is a command
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let decl = engine_state.get_decl(decl_id);
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let sig = decl.signature();
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let vec_of_required = &sig.required_positional;
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let vec_of_optional = &sig.optional_positional;
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let rest = &sig.rest_positional;
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let vec_of_flags = &sig.named;
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let type_signatures = &sig.input_output_types;
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if decl.is_alias() {
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if let Some(alias) = &decl.as_alias() {
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let contents = String::from_utf8_lossy(
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engine_state.get_span_contents(alias.wrapped_call.span),
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);
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Ok(Value::string(contents, call.head).into_pipeline_data())
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} else {
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Ok(Value::string("no alias found", call.head).into_pipeline_data())
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}
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}
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// gets vector of positionals.
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else if let Some(block_id) = decl.get_block_id() {
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let block = engine_state.get_block(block_id);
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if let Some(block_span) = block.span {
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let contents = engine_state.get_span_contents(block_span);
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// name of function
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let mut final_contents = String::new();
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if val.contains(' ') {
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let _ = write!(&mut final_contents, "def \"{val}\" [");
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} else {
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let _ = write!(&mut final_contents, "def {val} [");
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};
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if !vec_of_required.is_empty()
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|| !vec_of_optional.is_empty()
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|| vec_of_flags.len() != 1
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|| rest.is_some()
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{
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final_contents.push(' ');
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}
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for n in vec_of_required {
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let _ = write!(&mut final_contents, "{}: {} ", n.name, n.shape);
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// positional arguments
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}
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for n in vec_of_optional {
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if let Some(s) = n.default_value.clone() {
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let _ = write!(
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&mut final_contents,
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"{}: {} = {} ",
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n.name,
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n.shape,
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s.to_expanded_string(" ", &Config::default())
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);
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} else {
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let _ =
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write!(&mut final_contents, "{}?: {} ", n.name, n.shape);
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}
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}
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for n in vec_of_flags {
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// skip adding the help flag
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if n.long == "help" {
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continue;
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}
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let _ = write!(&mut final_contents, "--{}", n.long);
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if let Some(short) = n.short {
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let _ = write!(&mut final_contents, "(-{})", short);
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}
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if let Some(arg) = &n.arg {
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let _ = write!(&mut final_contents, ": {}", arg);
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}
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final_contents.push(' ');
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}
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if let Some(rest_arg) = rest {
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let _ = write!(
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&mut final_contents,
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"...{}:{}",
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rest_arg.name, rest_arg.shape
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);
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}
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let len = type_signatures.len();
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if len != 0 {
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final_contents.push_str("]: [");
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let mut c = 0;
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for (insig, outsig) in type_signatures {
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c += 1;
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let s = format!("{} -> {}", insig, outsig);
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final_contents.push_str(&s);
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if c != len {
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final_contents.push_str(", ")
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}
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}
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}
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final_contents.push_str("] ");
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final_contents.push_str(&String::from_utf8_lossy(contents));
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Ok(Value::string(final_contents, call.head).into_pipeline_data())
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} else {
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Err(ShellError::GenericError {
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error: "Cannot view value".to_string(),
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msg: "the command does not have a viewable block span".to_string(),
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span: Some(arg_span),
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help: None,
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inner: vec![],
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})
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}
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} else {
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Err(ShellError::GenericError {
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error: "Cannot view value".to_string(),
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msg: "the command does not have a viewable block".to_string(),
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span: Some(arg_span),
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help: None,
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inner: vec![],
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})
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}
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} else if let Some(module_id) = engine_state.find_module(val.as_bytes(), &[]) {
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// arg is a module
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let module = engine_state.get_module(module_id);
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if let Some(module_span) = module.span {
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let contents = engine_state.get_span_contents(module_span);
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Ok(Value::string(String::from_utf8_lossy(contents), call.head)
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.into_pipeline_data())
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} else {
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Err(ShellError::GenericError {
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error: "Cannot view value".to_string(),
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msg: "the module does not have a viewable block".to_string(),
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span: Some(arg_span),
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help: None,
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inner: vec![],
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})
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}
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} else {
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Err(ShellError::GenericError {
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error: "Cannot view value".to_string(),
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msg: "this name does not correspond to a viewable value".to_string(),
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span: Some(arg_span),
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help: None,
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inner: vec![],
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})
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}
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}
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value => {
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if let Ok(closure) = value.as_closure() {
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let block = engine_state.get_block(closure.block_id);
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if let Some(span) = block.span {
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let contents = engine_state.get_span_contents(span);
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Ok(Value::string(String::from_utf8_lossy(contents), call.head)
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.into_pipeline_data())
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} else {
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Ok(Value::string("<internal command>", call.head).into_pipeline_data())
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}
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} else {
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Err(ShellError::GenericError {
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error: "Cannot view value".to_string(),
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msg: "this value cannot be viewed".to_string(),
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span: Some(arg_span),
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help: None,
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inner: vec![],
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})
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}
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}
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}
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "View the source of a code block",
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example: r#"let abc = {|| echo 'hi' }; view source $abc"#,
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result: Some(Value::test_string("{|| echo 'hi' }")),
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},
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Example {
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description: "View the source of a custom command",
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example: r#"def hi [] { echo 'Hi!' }; view source hi"#,
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result: Some(Value::test_string("def hi [] { echo 'Hi!' }")),
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},
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Example {
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description: "View the source of a custom command, which participates in the caller environment",
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example: r#"def --env foo [] { $env.BAR = 'BAZ' }; view source foo"#,
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result: Some(Value::test_string("def foo [] { $env.BAR = 'BAZ' }")),
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},
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Example {
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description: "View the source of a custom command with flags and arguments",
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example: r#"def test [a?:any --b:int ...rest:string] { echo 'test' }; view source test"#,
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result: Some(Value::test_string("def test [ a?: any --b: int ...rest: string] { echo 'test' }")),
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},
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Example {
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description: "View the source of a module",
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example: r#"module mod-foo { export-env { $env.FOO_ENV = 'BAZ' } }; view source mod-foo"#,
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result: Some(Value::test_string(" export-env { $env.FOO_ENV = 'BAZ' }")),
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},
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Example {
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description: "View the source of an alias",
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example: r#"alias hello = echo hi; view source hello"#,
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result: Some(Value::test_string("echo hi")),
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},
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]
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}
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}
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