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https://github.com/nushell/nushell.git
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03c9eaf005
In Nu we have variables (E.g. $var-name) and these contain `Value` types. This means we can bind to variables any structured data and column path syntax (E.g. `$variable.path.to`) allows flexibility for "querying" said structures. Here we offer completions for these. For example, in a Nushell session the variable `$nu` contains environment values among other things. If we wanted to see in the screen some environment variable (say the var `SHELL`) we do: ``` > echo $nu.env.SHELL ``` with completions we can now do: `echo $nu.env.S[\TAB]` and we get suggestions that start at the column path `$nu.env` with vars starting with the letter `S` in this case `SHELL` appears in the suggestions.
84 lines
2.0 KiB
Rust
84 lines
2.0 KiB
Rust
use crate::{UntaggedValue, Value};
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use nu_errors::ShellError;
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use std::path::{Component, Path, PathBuf};
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fn is_value_tagged_dir(value: &Value) -> bool {
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matches!(
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&value.value,
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UntaggedValue::Row(_) | UntaggedValue::Table(_)
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)
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}
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#[derive(Debug, Eq, Ord, PartialEq, PartialOrd)]
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pub struct ValueResource {
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pub at: usize,
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pub loc: PathBuf,
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}
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impl ValueResource {}
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#[derive(Default, Debug)]
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pub struct ValueStructure {
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pub resources: Vec<ValueResource>,
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}
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impl ValueStructure {
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pub fn new() -> ValueStructure {
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ValueStructure {
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resources: Vec::<ValueResource>::new(),
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}
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}
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pub fn exists(&self, path: &Path) -> bool {
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if path == Path::new("/") {
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return true;
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}
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let path = if path.starts_with("/") {
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path.strip_prefix("/").unwrap_or(path)
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} else {
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path
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};
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let comps: Vec<_> = path.components().map(Component::as_os_str).collect();
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let mut is_there = true;
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for (at, fragment) in comps.iter().enumerate() {
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is_there = is_there
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&& self
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.resources
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.iter()
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.any(|resource| at == resource.at && *fragment == resource.loc.as_os_str());
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}
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is_there
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}
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pub fn walk_decorate(&mut self, start: &Value) -> Result<(), ShellError> {
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self.resources = Vec::<ValueResource>::new();
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self.build(start, 0)?;
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self.resources.sort();
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Ok(())
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}
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fn build(&mut self, src: &Value, lvl: usize) -> Result<(), ShellError> {
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for entry in src.row_entries() {
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let value = entry.1;
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let path = entry.0;
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self.resources.push(ValueResource {
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at: lvl,
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loc: PathBuf::from(path),
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});
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if is_value_tagged_dir(value) {
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self.build(value, lvl + 1)?;
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}
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}
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Ok(())
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}
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}
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