shadowplay 0.16.3

Utility for checking puppet syntax, a puppet manifest linter, a pretty printer, and a utility for exploring the Hiera.
Documentation 
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use serde::{Deserialize, Serialize};

use crate::puppet_pp_lint::lint::{EarlyLintPass, LintError, LintPass};

#[derive(Clone, Serialize, Deserialize)]
pub struct UnusedVariables;

impl LintPass for UnusedVariables {
    fn name(&self) -> &str {
        "UnusedVariables"
    }
    fn description(&self) -> &str {
        "Checks for unused variables"
    }
}

impl EarlyLintPass for UnusedVariables {
    fn check_ctx(&self, ctx: &crate::puppet_pp_lint::ctx::Ctx) -> Vec<LintError> {
        let mut errors = Vec::new();
        let variables = ctx.variables.borrow();

        for (varname, variable) in &*variables {
            let use_count = variable.use_count.borrow();
            if *use_count > 0 {
                continue;
            }

            match &variable.variant {
                crate::puppet_pp_lint::ctx::VariableVariant::Builtin => (),
                crate::puppet_pp_lint::ctx::VariableVariant::Defined(variable) => errors.push(LintError::new(
                    Box::new(self.clone()),
                    &format!("Variable '{}' is never used [EXPERIMENTAL]", varname),
                    &variable.extra,
                )),
                crate::puppet_pp_lint::ctx::VariableVariant::Argument(arg) => errors.push(LintError::new(
                    Box::new(self.clone()),
                    &format!("Argument '{}' is never used [EXPERIMENTAL]", varname),
                    &arg.extra,
                )),
                crate::puppet_pp_lint::ctx::VariableVariant::Phantom => (),
            }
        }

        errors
    }
}