mirror of
https://github.com/nushell/nushell.git
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419 lines
16 KiB
Python
419 lines
16 KiB
Python
# Example of using a Python script as a Nushell plugin
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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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# Cap'n Proto to move data between 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 stdout
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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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# This plugin uses python3
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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": "help",
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"short": "h",
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"arg": None,
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"required": False,
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"desc": "Display this help message",
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"var_id": None
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},
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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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"search_terms": ["Python", "Example"],
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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 pipeline
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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(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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