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c747ec75c9
# Description
When implementing a `Command`, one must also import all the types
present in the function signatures for `Command`. This makes it so that
we often import the same set of types in each command implementation
file. E.g., something like this:
```rust
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
ShellError, Signature, Span, Type, Value,
};
```
This PR adds the `nu_engine::command_prelude` module which contains the
necessary and commonly used types to implement a `Command`:
```rust
// command_prelude.rs
pub use crate::CallExt;
pub use nu_protocol::{
ast::{Call, CellPath},
engine::{Command, EngineState, Stack},
record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, IntoSpanned,
PipelineData, Record, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
};
```
This should reduce the boilerplate needed to implement a command and
also gives us a place to track the breadth of the `Command` API. I tried
to be conservative with what went into the prelude modules, since it
might be hard/annoying to remove items from the prelude in the future.
Let me know if something should be included or excluded.
75 lines
2.1 KiB
Rust
75 lines
2.1 KiB
Rust
use crate::database::{SQLiteDatabase, MEMORY_DB};
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use nu_engine::command_prelude::*;
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#[derive(Clone)]
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pub struct StorOpen;
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impl Command for StorOpen {
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fn name(&self) -> &str {
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"stor open"
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}
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fn signature(&self) -> Signature {
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Signature::build("stor open")
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.input_output_types(vec![(
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Type::Nothing,
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Type::Custom("sqlite-in-memory".into()),
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)])
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.allow_variants_without_examples(true)
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.category(Category::Database)
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}
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fn usage(&self) -> &str {
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"Opens the in-memory sqlite database."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["sqlite", "storing", "access"]
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Open the in-memory sqlite database",
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example: "stor open",
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result: None,
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}]
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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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// eprintln!("Initializing nudb");
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// eprintln!("Here's some things to try:");
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// eprintln!("* stor open | schema | table -e");
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// eprintln!("* stor open | query db 'insert into nudb (bool1,int1,float1,str1,datetime1) values (2,200,2.0,'str2','1969-04-17T06:00:00-05:00')'");
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// eprintln!("* stor open | query db 'select * from nudb'");
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// eprintln!("Now imagine all those examples happening as commands, without sql, in our normal nushell pipelines\n");
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// TODO: Think about adding the following functionality
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// * stor open --table-name my_table_name
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// It returns the output of `select * from my_table_name`
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// Just create an empty database with MEMORY_DB and nothing else
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let db = Box::new(SQLiteDatabase::new(std::path::Path::new(MEMORY_DB), None));
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// dbg!(db.clone());
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Ok(db.into_value(call.head).into_pipeline_data())
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(StorOpen {})
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}
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}
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