use miette::Diagnostic;
use serde::{Deserialize, Serialize};
use thiserror::Error;
use crate::{ast::Operator, Span, Type};
/// The fundamental error type for the evaluation engine. These cases represent different kinds of errors
/// the evaluator might face, along with helpful spans to label. An error renderer will take this error value
/// and pass it into an error viewer to display to the user.
#[derive(Debug, Clone, Error, Diagnostic, Serialize, Deserialize)]
pub enum ShellError {
/// An operator received two arguments of incompatible types.
///
/// ## Resolution
///
/// Check each argument's type and convert one or both as needed.
#[error("Type mismatch during operation.")]
#[diagnostic(code(nu::shell::type_mismatch), url(docsrs))]
OperatorMismatch {
#[label = "type mismatch for operator"]
op_span: Span,
lhs_ty: Type,
#[label("{lhs_ty}")]
lhs_span: Span,
rhs_ty: Type,
#[label("{rhs_ty}")]
rhs_span: Span,
},
/// An arithmetic operation's resulting value overflowed its possible size.
///
/// ## Resolution
///
/// Check the inputs to the operation and add guards for their sizes.
/// Integers are generally of size i64, floats are generally f64.
#[error("Operator overflow.")]
#[diagnostic(code(nu::shell::operator_overflow), url(docsrs))]
OperatorOverflow(String, #[label = "{0}"] Span),
/// The pipelined input into a command was not of the expected type. For example, it might
/// expect a string input, but received a table instead.
///
/// ## Resolution
///
/// Check the relevant pipeline and extract or convert values as needed.
#[error("Pipeline mismatch.")]
#[diagnostic(code(nu::shell::pipeline_mismatch), url(docsrs))]
PipelineMismatch(
String,
#[label("expected: {0}")] Span,
#[label("value originates from here")] Span,
),
/// A command received an argument of the wrong type.
///
/// ## Resolution
///
/// Convert the argument type before passing it in, or change the command to accept the type.
#[error("Type mismatch")]
#[diagnostic(code(nu::shell::type_mismatch), url(docsrs))]
TypeMismatch(String, #[label = "needs {0}"] Span),
/// This value cannot be used with this operator.
///
/// ## Resolution
///
/// Not all values, for example custom values, can be used with all operators. Either
/// implement support for the operator on this type, or convert the type to a supported one.
#[error("Unsupported operator: {0}.")]
#[diagnostic(code(nu::shell::unsupported_operator), url(docsrs))]
UnsupportedOperator(Operator, #[label = "unsupported operator"] Span),
/// An operator was not recognized during evaluation.
///
/// ## Resolution
///
/// Did you write the correct operator?
#[error("Unknown operator: {0}.")]
#[diagnostic(code(nu::shell::unknown_operator), url(docsrs))]
UnknownOperator(String, #[label = "unknown operator"] Span),
/// An expected command parameter is missing.
///
/// ## Resolution
///
/// Add the expected parameter and try again.
#[error("Missing parameter: {0}.")]
#[diagnostic(code(nu::shell::missing_parameter), url(docsrs))]
MissingParameter(String, #[label = "missing parameter: {0}"] Span),
/// Two parameters conflict with each other or are otherwise mutually exclusive.
///
/// ## Resolution
///
/// Remove one of the parameters/options and try again.
#[error("Incompatible parameters.")]
#[diagnostic(code(nu::shell::incompatible_parameters), url(docsrs))]
IncompatibleParameters {
left_message: String,
// Be cautious, as flags can share the same span, resulting in a panic (ex: `rm -pt`)
#[label("{left_message}")]
left_span: Span,
right_message: String,
#[label("{right_message}")]
right_span: Span,
},
/// There's some issue with number or matching of delimiters in an expression.
///
/// ## Resolution
///
/// Check your syntax for mismatched braces, RegExp syntax errors, etc, based on the specific error message.
#[error("Delimiter error")]
#[diagnostic(code(nu::shell::delimiter_error), url(docsrs))]
DelimiterError(String, #[label("{0}")] Span),
/// An operation received parameters with some sort of incompatibility
/// (for example, different number of rows in a table, incompatible column names, etc).
///
/// ## Resolution
///
/// Refer to the specific error message for details on what's incompatible and then fix your
/// inputs to make sure they match that way.
#[error("Incompatible parameters.")]
#[diagnostic(code(nu::shell::incompatible_parameters), url(docsrs))]
IncompatibleParametersSingle(String, #[label = "{0}"] Span),
/// This build of nushell implements this feature, but it has not been enabled.
///
/// ## Resolution
///
/// Rebuild nushell with the appropriate feature enabled.
#[error("Feature not enabled.")]
#[diagnostic(code(nu::shell::feature_not_enabled), url(docsrs))]
FeatureNotEnabled(#[label = "feature not enabled"] Span),
/// You're trying to run an unsupported external command.
///
/// ## Resolution
///
/// Make sure there's an appropriate `run-external` declaration for this external command.
#[error("Running external commands not supported")]
#[diagnostic(code(nu::shell::external_commands), url(docsrs))]
ExternalNotSupported(#[label = "external not supported"] Span),
/// The given probability input is invalid. The probability must be between 0 and 1.
///
/// ## Resolution
///
/// Make sure the probability is between 0 and 1 and try again.
#[error("Invalid Probability.")]
#[diagnostic(code(nu::shell::invalid_probability), url(docsrs))]
InvalidProbability(#[label = "invalid probability"] Span),
/// The first value in a `..` range must be compatible with the second one.
///
/// ## Resolution
///
/// Check to make sure both values are compatible, and that the values are enumerable in Nushell.
#[error("Invalid range {0}..{1}")]
#[diagnostic(code(nu::shell::invalid_range), url(docsrs))]
InvalidRange(String, String, #[label = "expected a valid range"] Span),
/// Catastrophic nushell failure. This reflects a completely unexpected or unrecoverable error.
///
/// ## Resolution
///
/// It is very likely that this is a bug. Please file an issue at https://github.com/nushell/nushell/issues with relevant information.
#[error("Nushell failed: {0}.")]
#[diagnostic(code(nu::shell::nushell_failed), url(docsrs))]
// Only use this one if Nushell completely falls over and hits a state that isn't possible or isn't recoverable
NushellFailed(String),
/// Catastrophic nushell failure. This reflects a completely unexpected or unrecoverable error.
///
/// ## Resolution
///
/// It is very likely that this is a bug. Please file an issue at https://github.com/nushell/nushell/issues with relevant information.
#[error("Nushell failed: {0}.")]
#[diagnostic(code(nu::shell::nushell_failed_spanned), url(docsrs))]
// Only use this one if Nushell completely falls over and hits a state that isn't possible or isn't recoverable
NushellFailedSpanned(String, String, #[label = "{1}"] Span),
/// Catastrophic nushell failure. This reflects a completely unexpected or unrecoverable error.
///
/// ## Resolution
///
/// It is very likely that this is a bug. Please file an issue at https://github.com/nushell/nushell/issues with relevant information.
#[error("Nushell failed: {0}.")]
#[diagnostic(code(nu::shell::nushell_failed_help), url(docsrs))]
// Only use this one if Nushell completely falls over and hits a state that isn't possible or isn't recoverable
NushellFailedHelp(String, #[help] String),
/// Catastrophic nushell failure. This reflects a completely unexpected or unrecoverable error.
///
/// ## Resolution
///
/// It is very likely that this is a bug. Please file an issue at https://github.com/nushell/nushell/issues with relevant information.
#[error("Nushell failed: {0}.")]
#[diagnostic(code(nu::shell::nushell_failed_spanned_help), url(docsrs))]
// Only use this one if Nushell completely falls over and hits a state that isn't possible or isn't recoverable
NushellFailedSpannedHelp(String, String, #[label = "{1}"] Span, #[help] String),
/// A referenced variable was not found at runtime.
///
/// ## Resolution
///
/// Check the variable name. Did you typo it? Did you forget to declare it? Is the casing right?
#[error("Variable not found")]
#[diagnostic(code(nu::shell::variable_not_found), url(docsrs))]
VariableNotFoundAtRuntime(#[label = "variable not found"] Span),
/// A referenced environment variable was not found at runtime.
///
/// ## Resolution
///
/// Check the environment variable name. Did you typo it? Did you forget to declare it? Is the casing right?
#[error("Environment variable '{0}' not found")]
#[diagnostic(code(nu::shell::env_variable_not_found), url(docsrs))]
EnvVarNotFoundAtRuntime(String, #[label = "environment variable not found"] Span),
/// A referenced module was not found at runtime.
///
/// ## Resolution
///
/// Check the module name. Did you typo it? Did you forget to declare it? Is the casing right?
#[error("Module '{0}' not found")]
#[diagnostic(code(nu::shell::module_not_found), url(docsrs))]
ModuleNotFoundAtRuntime(String, #[label = "module not found"] Span),
/// A referenced module or overlay was not found at runtime.
///
/// ## Resolution
///
/// Check the module name. Did you typo it? Did you forget to declare it? Is the casing right?
#[error("Module or overlay'{0}' not found")]
#[diagnostic(code(nu::shell::module_or_overlay_not_found), url(docsrs))]
ModuleOrOverlayNotFoundAtRuntime(String, #[label = "not a module or overlay"] Span),
/// A referenced overlay was not found at runtime.
///
/// ## Resolution
///
/// Check the overlay name. Did you typo it? Did you forget to declare it? Is the casing right?
#[error("Overlay '{0}' not found")]
#[diagnostic(code(nu::shell::overlay_not_found), url(docsrs))]
OverlayNotFoundAtRuntime(String, #[label = "overlay not found"] Span),
/// The given item was not found. This is a fairly generic error that depends on context.
///
/// ## Resolution
///
/// This error is triggered in various places, and simply signals that "something" was not found. Refer to the specific error message for further details.
#[error("Not found.")]
#[diagnostic(code(nu::parser::not_found), url(docsrs))]
NotFound(#[label = "did not find anything under this name"] Span),
/// Failed to convert a value of one type into a different type.
///
/// ## Resolution
///
/// Not all values can be coerced this way. Check the supported type(s) and try again.
#[error("Can't convert to {0}.")]
#[diagnostic(code(nu::shell::cant_convert), url(docsrs))]
CantConvert(
String,
String,
#[label("can't convert {1} to {0}")] Span,
#[help] Option<String>,
),
/// Failed to convert a value of one type into a different type. Includes hint for what the first value is.
///
/// ## Resolution
///
/// Not all values can be coerced this way. Check the supported type(s) and try again.
#[error("Can't convert {1} `{2}` to {0}.")]
#[diagnostic(code(nu::shell::cant_convert_with_value), url(docsrs))]
CantConvertWithValue(
String,
String,
String,
#[label("can't be converted to {0}")] Span,
#[label("this {1} value...")] Span,
#[help] Option<String>,
),
/// An environment variable cannot be represented as a string.
///
/// ## Resolution
///
/// Not all types can be converted to environment variable values, which must be strings. Check the input type and try again.
#[error("{0} is not representable as a string.")]
#[diagnostic(
code(nu::shell::env_var_not_a_string),
url(docsrs),
help(
r#"The '{0}' environment variable must be a string or be convertible to a string.
Either make sure {0} is a string, or add a 'to_string' entry for it in ENV_CONVERSIONS."#
)
)]
EnvVarNotAString(String, #[label("value not representable as a string")] Span),
/// Division by zero is not a thing.
///
/// ## Resolution
///
/// Add a guard of some sort to check whether a denominator input to this division is zero, and branch off if that's the case.
#[error("Division by zero.")]
#[diagnostic(code(nu::shell::division_by_zero), url(docsrs))]
DivisionByZero(#[label("division by zero")] Span),
/// An error happened while tryin to create a range.
///
/// This can happen in various unexpected situations, for example if the range would loop forever (as would be the case with a 0-increment).
///
/// ## Resolution
///
/// Check your range values to make sure they're countable and would not loop forever.
#[error("Can't convert range to countable values")]
#[diagnostic(code(nu::shell::range_to_countable), url(docsrs))]
CannotCreateRange(#[label = "can't convert to countable values"] Span),
/// You attempted to access an index beyond the available length of a value.
///
/// ## Resolution
///
/// Check your lengths and try again.
#[error("Row number too large (max: {0}).")]
#[diagnostic(code(nu::shell::access_beyond_end), url(docsrs))]
AccessBeyondEnd(usize, #[label = "index too large (max: {0})"] Span),
/// You attempted to access an index beyond the available length of a stream.
///
/// ## Resolution
///
/// Check your lengths and try again.
#[error("Row number too large.")]
#[diagnostic(code(nu::shell::access_beyond_end_of_stream), url(docsrs))]
AccessBeyondEndOfStream(#[label = "index too large"] Span),
/// Tried to index into a type that does not support pathed access.
///
/// ## Resolution
///
/// Check your types. Only composite types can be pathed into.
#[error("Data cannot be accessed with a cell path")]
#[diagnostic(code(nu::shell::incompatible_path_access), url(docsrs))]
IncompatiblePathAccess(String, #[label("{0} doesn't support cell paths")] Span),
/// The requested column does not exist.
///
/// ## Resolution
///
/// Check the spelling of your column name. Did you forget to rename a column somewhere?
#[error("Cannot find column")]
#[diagnostic(code(nu::shell::column_not_found), url(docsrs))]
CantFindColumn(
#[label = "cannot find column"] Span,
#[label = "value originates here"] Span,
),
/// Attempted to insert a column into a table, but a column with that name already exists.
///
/// ## Resolution
///
/// Drop or rename the existing column (check `rename -h`) and try again.
#[error("Column already exists")]
#[diagnostic(code(nu::shell::column_already_exists), url(docsrs))]
ColumnAlreadyExists(
#[label = "column already exists"] Span,
#[label = "value originates here"] Span,
),
/// The given operation can only be performed on lists.
///
/// ## Resolution
///
/// Check the input type to this command. Are you sure it's a list?
#[error("Not a list value")]
#[diagnostic(code(nu::shell::not_a_list), url(docsrs))]
NotAList(
#[label = "value not a list"] Span,
#[label = "value originates here"] Span,
),
/// An error happened while performing an external command.
///
/// ## Resolution
///
/// This error is fairly generic. Refer to the specific error message for further details.
#[error("External command")]
#[diagnostic(code(nu::shell::external_command), url(docsrs), help("{1}"))]
ExternalCommand(String, String, #[label("{0}")] Span),
/// An operation was attempted with an input unsupported for some reason.
///
/// ## Resolution
///
/// This error is fairly generic. Refer to the specific error message for further details.
#[error("Unsupported input")]
#[diagnostic(code(nu::shell::unsupported_input), url(docsrs))]
UnsupportedInput(String, #[label("{0}")] Span),
/// Failed to parse an input into a datetime value.
///
/// ## Resolution
///
/// Make sure your datetime input format is correct.
///
/// For example, these are some valid formats:
///
/// * "5 pm"
/// * "2020/12/4"
/// * "2020.12.04 22:10 +2"
/// * "2020-04-12 22:10:57 +02:00"
/// * "2020-04-12T22:10:57.213231+02:00"
/// * "Tue, 1 Jul 2003 10:52:37 +0200""#
#[error("Unable to parse datetime")]
#[diagnostic(
code(nu::shell::datetime_parse_error),
url(docsrs),
help(
r#"Examples of supported inputs:
* "5 pm"
* "2020/12/4"
* "2020.12.04 22:10 +2"
* "2020-04-12 22:10:57 +02:00"
* "2020-04-12T22:10:57.213231+02:00"
* "Tue, 1 Jul 2003 10:52:37 +0200""#
)
)]
DatetimeParseError(#[label("datetime parsing failed")] Span),
/// A network operation failed.
///
/// ## Resolution
///
/// It's always DNS.
#[error("Network failure")]
#[diagnostic(code(nu::shell::network_failure), url(docsrs))]
NetworkFailure(String, #[label("{0}")] Span),
/// Help text for this command could not be found.
///
/// ## Resolution
///
/// Check the spelling for the requested command and try again. Are you sure it's defined and your configurations are loading correctly? Can you execute it?
#[error("Command not found")]
#[diagnostic(code(nu::shell::command_not_found), url(docsrs))]
CommandNotFound(#[label("command not found")] Span),
/// A flag was not found.
#[error("Flag not found")]
#[diagnostic(code(nu::shell::flag_not_found), url(docsrs))]
// NOTE: Seems to be unused. Removable?
FlagNotFound(String, #[label("{0} not found")] Span),
/// Failed to find a file during a nushell operation.
///
/// ## Resolution
///
/// Does the file in the error message exist? Is it readable and accessible? Is the casing right?
#[error("File not found")]
#[diagnostic(code(nu::shell::file_not_found), url(docsrs))]
FileNotFound(#[label("file not found")] Span),
/// Failed to find a file during a nushell operation.
///
/// ## Resolution
///
/// Does the file in the error message exist? Is it readable and accessible? Is the casing right?
#[error("File not found")]
#[diagnostic(code(nu::shell::file_not_found), url(docsrs))]
FileNotFoundCustom(String, #[label("{0}")] Span),
/// A plugin failed to load.
///
/// ## Resolution
///
/// This is a failry generic error. Refer to the specific error message for further details.
#[error("Plugin failed to load: {0}")]
#[diagnostic(code(nu::shell::plugin_failed_to_load), url(docsrs))]
PluginFailedToLoad(String),
/// A message from a plugin failed to encode.
///
/// ## Resolution
///
/// This is likely a bug with the plugin itself.
#[error("Plugin failed to encode: {0}")]
#[diagnostic(code(nu::shell::plugin_failed_to_encode), url(docsrs))]
PluginFailedToEncode(String),
/// A message to a plugin failed to decode.
///
/// ## Resolution
///
/// This is either an issue with the inputs to a plugin (bad JSON?) or a bug in the plugin itself. Fix or report as appropriate.
#[error("Plugin failed to decode: {0}")]
#[diagnostic(code(nu::shell::plugin_failed_to_decode), url(docsrs))]
PluginFailedToDecode(String),
/// An I/O operation failed.
///
/// ## Resolution
///
/// This is a generic error. Refer to the specific error message for further details.
#[error("I/O error")]
#[diagnostic(code(nu::shell::io_error), url(docsrs), help("{0}"))]
IOError(String),
/// Tried to `cd` to a path that isn't a directory.
///
/// ## Resolution
///
/// Make sure the path is a directory. It currently exists, but is of some other type, like a file.
#[error("Cannot change to directory")]
#[diagnostic(code(nu::shell::cannot_cd_to_directory), url(docsrs))]
NotADirectory(#[label("is not a directory")] Span),
/// Attempted to perform an operation on a directory that doesn't exist.
///
/// ## Resolution
///
/// Make sure the directory in the error message actually exists before trying again.
#[error("Directory not found")]
#[diagnostic(code(nu::shell::directory_not_found), url(docsrs))]
DirectoryNotFound(#[label("directory not found")] Span, #[help] Option<String>),
/// Attempted to perform an operation on a directory that doesn't exist.
///
/// ## Resolution
///
/// Make sure the directory in the error message actually exists before trying again.
#[error("Directory not found")]
#[diagnostic(code(nu::shell::directory_not_found_custom), url(docsrs))]
DirectoryNotFoundCustom(String, #[label("{0}")] Span),
/// The requested move operation cannot be completed. This is typically because both paths exist,
/// but are of different types. For example, you might be trying to overwrite an existing file with
/// a directory.
///
/// ## Resolution
///
/// Make sure the destination path does not exist before moving a directory.
#[error("Move not possible")]
#[diagnostic(code(nu::shell::move_not_possible), url(docsrs))]
MoveNotPossible {
source_message: String,
#[label("{source_message}")]
source_span: Span,
destination_message: String,
#[label("{destination_message}")]
destination_span: Span,
},
/// The requested move operation cannot be completed. This is typically because both paths exist,
/// but are of different types. For example, you might be trying to overwrite an existing file with
/// a directory.
///
/// ## Resolution
///
/// Make sure the destination path does not exist before moving a directory.
#[error("Move not possible")]
#[diagnostic(code(nu::shell::move_not_possible_single), url(docsrs))]
// NOTE: Currently not actively used.
MoveNotPossibleSingle(String, #[label("{0}")] Span),
/// Failed to create either a file or directory.
///
/// ## Resolution
///
/// This is a fairly generic error. Refer to the specific error message for further details.
#[error("Create not possible")]
#[diagnostic(code(nu::shell::create_not_possible), url(docsrs))]
CreateNotPossible(String, #[label("{0}")] Span),
/// Changing the access time ("atime") of this file is not possible.
///
/// ## Resolution
///
/// This can be for various reasons, such as your platform or permission flags. Refer to the specific error message for more details.
#[error("Not possible to change the access time")]
#[diagnostic(code(nu::shell::change_access_time_not_possible), url(docsrs))]
ChangeAccessTimeNotPossible(String, #[label("{0}")] Span),
/// Changing the modification time ("mtime") of this file is not possible.
///
/// ## Resolution
///
/// This can be for various reasons, such as your platform or permission flags. Refer to the specific error message for more details.
#[error("Not possible to change the modified time")]
#[diagnostic(code(nu::shell::change_modified_time_not_possible), url(docsrs))]
ChangeModifiedTimeNotPossible(String, #[label("{0}")] Span),
/// Unable to remove this item.
#[error("Remove not possible")]
#[diagnostic(code(nu::shell::remove_not_possible), url(docsrs))]
// NOTE: Currently unused. Remove?
RemoveNotPossible(String, #[label("{0}")] Span),
// These three are unused. Remove?
#[error("No file to be removed")]
NoFileToBeRemoved(),
#[error("No file to be moved")]
NoFileToBeMoved(),
#[error("No file to be copied")]
NoFileToBeCopied(),
/// Error while trying to read a file
///
/// ## Resolution
///
/// The error will show the result from a file operation
#[error("Error trying to read file")]
#[diagnostic(code(nu::shell::error_reading_file), url(docsrs))]
ReadingFile(String, #[label("{0}")] Span),
/// A name was not found. Did you mean a different name?
///
/// ## Resolution
///
/// The error message will suggest a possible match for what you meant.
#[error("Name not found")]
#[diagnostic(code(nu::shell::name_not_found), url(docsrs))]
DidYouMean(String, #[label("did you mean '{0}'?")] Span),
/// The given input must be valid UTF-8 for further processing.
///
/// ## Resolution
///
/// Check your input's encoding. Are there any funny characters/bytes?
#[error("Non-UTF8 string")]
#[diagnostic(code(nu::parser::non_utf8), url(docsrs))]
NonUtf8(#[label = "non-UTF8 string"] Span),
/// A custom value could not be converted to a Dataframe.
///
/// ## Resolution
///
/// Make sure conversion to a Dataframe is possible for this value or convert it to a type that does, first.
#[error("Casting error")]
#[diagnostic(code(nu::shell::downcast_not_possible), url(docsrs))]
DowncastNotPossible(String, #[label("{0}")] Span),
/// The value given for this configuration is not supported.
///
/// ## Resolution
///
/// Refer to the specific error message for details and convert values as needed.
#[error("Unsupported config value")]
#[diagnostic(code(nu::shell::unsupported_config_value), url(docsrs))]
UnsupportedConfigValue(String, String, #[label = "expected {0}, got {1}"] Span),
/// An expected configuration value is not present.
///
/// ## Resolution
///
/// Refer to the specific error message and add the configuration value to your config file as needed.
#[error("Missing config value")]
#[diagnostic(code(nu::shell::missing_config_value), url(docsrs))]
MissingConfigValue(String, #[label = "missing {0}"] Span),
/// Negative value passed when positive ons is required.
///
/// ## Resolution
///
/// Guard against negative values or check your inputs.
#[error("Negative value passed when positive one is required")]
#[diagnostic(code(nu::shell::needs_positive_value), url(docsrs))]
NeedsPositiveValue(#[label = "use a positive value"] Span),
/// This is a generic error type used for different situations.
#[error("{0}")]
#[diagnostic()]
GenericError(
String,
String,
#[label("{1}")] Option<Span>,
#[help] Option<String>,
#[related] Vec<ShellError>,
),
/// This is a generic error type used for different situations.
#[error("{1}")]
#[diagnostic()]
OutsideSpannedLabeledError(#[source_code] String, String, String, #[label("{2}")] Span),
/// Attempted to use a deprecated command.
///
/// ## Resolution
///
/// Check the help for the new suggested command and update your script accordingly.
#[error("Deprecated command {0}")]
#[diagnostic(code(nu::shell::deprecated_command), url(docsrs))]
DeprecatedCommand(
String,
String,
#[label = "'{0}' is deprecated. Please use '{1}' instead."] Span,
),
/// Non-Unicode input received.
///
/// ## Resolution
///
/// Check that your path is UTF-8 compatible.
#[error("Non-Unicode input received.")]
#[diagnostic(code(nu::shell::non_unicode_input), url(docsrs))]
NonUnicodeInput,
// /// Path not found.
// #[error("Path not found.")]
// PathNotFound,
/// Unexpected abbr component.
///
/// ## Resolution
///
/// Check the path abbreviation to ensure that it is valid.
#[error("Unexpected abbr component `{0}`.")]
#[diagnostic(code(nu::shell::unexpected_path_abbreviateion), url(docsrs))]
UnexpectedAbbrComponent(String),
}
impl From<std::io::Error> for ShellError {
fn from(input: std::io::Error) -> ShellError {
ShellError::IOError(format!("{:?}", input))
}
}
impl std::convert::From<Box<dyn std::error::Error>> for ShellError {
fn from(input: Box<dyn std::error::Error>) -> ShellError {
ShellError::IOError(input.to_string())
}
}
impl From<Box<dyn std::error::Error + Send + Sync>> for ShellError {
fn from(input: Box<dyn std::error::Error + Send + Sync>) -> ShellError {
ShellError::IOError(format!("{:?}", input))
}
}
pub fn into_code(err: &ShellError) -> Option<String> {
err.code().map(|code| code.to_string())
}
pub fn did_you_mean(possibilities: &[String], tried: &str) -> Option<String> {
let mut possible_matches: Vec<_> = possibilities
.iter()
.map(|word| {
let edit_distance = levenshtein_distance(&word.to_lowercase(), &tried.to_lowercase());
(edit_distance, word.to_owned())
})
.collect();
possible_matches.sort();
if let Some((_, first)) = possible_matches.into_iter().next() {
Some(first)
} else {
None
}
}
// Borrowed from here https://github.com/wooorm/levenshtein-rs
pub fn levenshtein_distance(a: &str, b: &str) -> usize {
let mut result = 0;
/* Shortcut optimizations / degenerate cases. */
if a == b {
return result;
}
let length_a = a.chars().count();
let length_b = b.chars().count();
if length_a == 0 {
return length_b;
}
if length_b == 0 {
return length_a;
}
/* Initialize the vector.
*
* This is why it’s fast, normally a matrix is used,
* here we use a single vector. */
let mut cache: Vec<usize> = (1..).take(length_a).collect();
let mut distance_a;
let mut distance_b;
/* Loop. */
for (index_b, code_b) in b.chars().enumerate() {
result = index_b;
distance_a = index_b;
for (index_a, code_a) in a.chars().enumerate() {
distance_b = if code_a == code_b {
distance_a
} else {
distance_a + 1
};
distance_a = cache[index_a];
result = if distance_a > result {
if distance_b > result {
result + 1
} else {
distance_b
}
} else if distance_b > distance_a {
distance_a + 1
} else {
distance_b
};
cache[index_a] = result;
}
}
result
}
#[cfg(test)]
mod tests {
use super::did_you_mean;
#[test]
fn did_you_mean_works_with_wrong_case() {
let possibilities = &["OS".into(), "PWD".into()];
let actual = did_you_mean(possibilities, "pwd");
let expected = Some(String::from("PWD"));
assert_eq!(actual, expected)
}
#[test]
fn did_you_mean_works_with_typo() {
let possibilities = &["OS".into(), "PWD".into()];
let actual = did_you_mean(possibilities, "PWF");
let expected = Some(String::from("PWD"));
assert_eq!(actual, expected)
}
#[test]
fn did_you_mean_works_with_wrong_case_and_typo() {
let possibilities = &["OS".into(), "PWD".into()];
let actual = did_you_mean(possibilities, "pwf");
let expected = Some(String::from("PWD"));
assert_eq!(actual, expected)
}
}