mirror of
https://github.com/nushell/nushell.git
synced 2024-11-22 00:13:21 +01:00
Calling plugin without shell (#516)
* calling plugin without shell * spelling error
This commit is contained in:
Fernando Herrera
GitHub
parent
ada9c742c6
commit
d8847f1082
@ -36,17 +36,33 @@ pub trait PluginEncoder: Clone {
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}
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fn create_command(path: &Path) -> CommandSys {
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//TODO. The selection of shell could be modifiable from the config file.
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let mut process = if cfg!(windows) {
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let mut process = CommandSys::new("cmd");
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process.arg("/c").arg(path);
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let mut process = match path.extension() {
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None => std::process::Command::new(path),
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Some(extension) => {
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let (shell, separator) = match extension.to_str() {
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Some("cmd") | Some("bat") => (Some("cmd"), Some("/c")),
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Some("sh") => (Some("sh"), Some("-c")),
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Some("py") => (Some("python"), None),
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_ => (None, None),
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};
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match (shell, separator) {
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(Some(shell), Some(separator)) => {
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let mut process = std::process::Command::new(shell);
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process.arg(separator);
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process.arg(path);
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process
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} else {
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let mut process = CommandSys::new("sh");
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process.arg("-c").arg(path);
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}
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(Some(shell), None) => {
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let mut process = std::process::Command::new(shell);
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process.arg(path);
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process
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}
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_ => std::process::Command::new(path),
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}
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}
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};
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// Both stdout and stdin are piped so we can receive information from the plugin
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@ -90,9 +106,10 @@ pub fn get_signature(path: &Path, encoding: &EncodingType) -> Result<Vec<Signatu
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))
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}?;
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// There is no need to wait for the child process to finish since the
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// signature has being collected
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Ok(signatures)
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match child.wait() {
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Ok(_) => Ok(signatures),
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Err(err) => Err(ShellError::PluginFailedToLoad(format!("{}", err))),
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}
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}
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// The next trait and functions are part of the plugin that is being created
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@ -168,15 +168,15 @@ pub enum ShellError {
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#[diagnostic(code(nu::shell::file_not_found), url(docsrs))]
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FileNotFoundCustom(String, #[label("{0}")] Span),
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#[error("Plugin failed to load")]
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#[error("Plugin failed to load: {0}")]
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#[diagnostic(code(nu::shell::plugin_failed_to_load), url(docsrs))]
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PluginFailedToLoad(String),
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#[error("Plugin failed to encode")]
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#[error("Plugin failed to encode: {0}")]
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#[diagnostic(code(nu::shell::plugin_failed_to_encode), url(docsrs))]
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PluginFailedToEncode(String),
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#[error("Plugin failed to decode")]
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#[error("Plugin failed to decode: {0}")]
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#[diagnostic(code(nu::shell::plugin_failed_to_decode), url(docsrs))]
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PluginFailedToDecode(String),
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408
crates/nu_plugin_python/plugin.py
Normal file
408
crates/nu_plugin_python/plugin.py
Normal file
@ -0,0 +1,408 @@
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# Example of using python as script to create plugins for nushell
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#
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# The example uses JSON encoding but it should be a similar process using
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# capnp proto to move data betwee nushell and the plugin. The only difference
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# would be that you need to compile the schema file in order have the objects
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# that decode and encode information that is read and written to stdin and stdour
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#
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# To register the plugin use:
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# register <path-to-py-file> -e json
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#
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# Be carefull with the spans. Miette will crash if a span is outside the
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# size of the contents vector. For this example we are using 0 and 1, which will
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# point to the beginning of the contents vector. We strongly suggest using the span
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# found in the plugin call head
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#
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# The plugin will be run using the active python implementation. If you are in
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# a python environment, that is the python version that is used
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#
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# Note: To keep the plugin simple and without dependencies, the dictionaries that
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# represent the data transferred between nushell and the plugin are kept as
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# native python dictionaries. The encoding and decoding process could be improved
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# by using libraries like pydantic and marshmallow
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#
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# Note: To debug plugins write to stderr using sys.stderr.write
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import sys
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import json
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def signatures():
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"""
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Multiple signatures can be sent to nushell. Each signature will be registered
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as a different plugin function in nushell.
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In your plugin logic you can use the name of the signature to indicate what
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operation should be done with the plugin
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"""
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return {
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"Signature": [
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{
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"name": "nu-python",
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"usage": "Signature test for python",
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"extra_usage": "",
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"required_positional": [
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{
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"name": "a",
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"desc": "required integer value",
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"shape": "Int",
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"var_id": None,
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},
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{
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"name": "b",
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"desc": "required string value",
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"shape": "String",
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"var_id": None,
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},
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],
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"optional_positional": [
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{
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"name": "opt",
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"desc": "Optional number",
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"shape": "Int",
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"var_id": None,
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}
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],
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"rest_positional": {
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"name": "rest",
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"desc": "rest value string",
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"shape": "String",
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"var_id": None,
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},
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"named": [
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{
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"long": "flag",
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"short": "f",
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"arg": None,
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"required": False,
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"desc": "a flag for the signature",
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"var_id": None,
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},
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{
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"long": "named",
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"short": "n",
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"arg": "String",
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"required": False,
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"desc": "named string",
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"var_id": None,
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},
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],
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"is_filter": False,
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"creates_scope": False,
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"category": "Experimental",
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}
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]
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}
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def process_call(plugin_call):
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"""
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plugin_call is a dictionary with the information from the call
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It should contain:
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- The name of the call
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- The call data which includes the positional and named values
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- The input from the pippeline
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Use this information to implement your plugin logic
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"""
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# Pretty printing the call to stderr
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sys.stderr.write(f"{json.dumps(plugin_call, indent=4)}")
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sys.stderr.write("\n")
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# Creates a Value of type List that will be encoded and sent to nushell
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return {
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"Value": {
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"List": {
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"vals": [
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 1,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 2,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 2,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 4,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 3,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 6,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 4,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 8,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 5,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 10,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 6,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 12,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 7,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 14,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 8,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 16,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Record": {
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"cols": ["one", "two", "three"],
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"vals": [
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{
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"Int": {
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"val": 0,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 9,
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"span": {"start": 0, "end": 1},
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}
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},
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{
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"Int": {
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"val": 18,
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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},
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],
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"span": {"start": 0, "end": 1},
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}
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}
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}
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def plugin():
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call_str = ",".join(sys.stdin.readlines())
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plugin_call = json.loads(call_str)
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if plugin_call == "Signature":
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signature = json.dumps(signatures())
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sys.stdout.write(signature)
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elif "CallInfo" in plugin_call:
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response = process_call(plugin_call)
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sys.stdout.write(json.dumps(response))
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else:
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# Use this error format if you want to return an error back to nushell
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error = {
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"Error": {
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"label": "ERROR from plugin",
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"msg": "error message pointing to call head span",
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"span": {"start": 0, "end": 1},
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}
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}
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sys.stdout.write(json.dumps(error))
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if __name__ == "__main__":
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plugin()
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