var.go

// This file handles environment variable parsing
package main

import (
	"fmt"
	"os"
	"strconv"

	"github.com/oalders/is/types"
)

//nolint:cyclop
func (r *VarCmd) Run(ctx *types.Context) error {
	ctx.Success = false

	val, set := os.LookupEnv(r.Name)
	switch r.Op {
	case "set":
		ctx.Success = set
		return nil
	case "unset":
		ctx.Success = !set
		return nil
	case "true":
		if !set {
			return fmt.Errorf("environment variable %s is not set", r.Name)
		}
		boolVal, err := strconv.ParseBool(val)
		if err != nil {
			return fmt.Errorf(
				"environment variable %s value %q cannot be parsed as boolean: %w",
				r.Name,
				val,
				err,
			)
		}
		ctx.Success = boolVal
		return nil
	case "false":
		if !set {
			return fmt.Errorf("environment variable %s is not set", r.Name)
		}
		boolVal, err := strconv.ParseBool(val)
		if err != nil {
			return fmt.Errorf(
				"environment variable %s value %q cannot be parsed as boolean: %w",
				r.Name,
				val,
				err,
			)
		}
		ctx.Success = !boolVal
		return nil
	default:
		if !set {
			return fmt.Errorf("environment variable %s is not set", r.Name)
		}
		success, err := compareOutput(ctx, r.Compare, r.Op, val, r.Val)
		ctx.Success = success
		return err
	}
}