fix: report undefined CLI binding env vars#1034
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Motivation: --ext-str NAME and --ext-code NAME read NAME from the environment when no = value is provided. If NAME was unset, sjsonnet either crashed with a NullPointerException (--ext-str) or produced a misleading extVar kind error (--ext-code), and --ext-code could even succeed when the binding was unused. Modification: Detect missing environment variables while parsing CLI bindings and return the same clean CLI-level error used by go-jsonnet. Keep the success path allocation-light with an empty-binding fast path, a single mutable map for non-empty bindings, and a stackless CLI exception only on the error path. Add jsonnet-resource + golden CLI regression tests for --ext-str and --ext-code. Result: Missing binding environment variables now fail eagerly with ERROR: environment variable NAME was undefined instead of leaking Java/internal errors or succeeding inconsistently.
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Motivation
--ext-str NAMEcrashed with a JavaNullPointerExceptionwhen the environment variableNAMEwas undefined.--ext-code NAMEproduced an unhelpful"Unsupported external variable kind: code"error. Reference implementations (C++ jsonnet, go-jsonnet) report a clean error message.--ext-str UNDEFINED_VARenvironment variable UNDEFINED_VAR was undefinedenvironment variable UNDEFINED_VAR was undefinedNullPointerExceptionstack traceenvironment variable UNDEFINED_VAR was undefinedModification
parseBindingsto use a singlecollection.mutable.HashMapwith while-loop iteration instead of chainedMap() ++ ... ++ ...with intermediate collections.System.getenv(s)fornullbefore invoking the value transformation, throwing aCliErrorwithfillInStackTraceoverridden to avoid JVM overhead.Map.emptyfast path when all binding lists are empty.--ext-str,--ext-code,--tla-str,--tla-code.Result
HashMapinstead of 8 intermediate collections from chained.mapand++calls.Map.emptywithout allocating.CliError.fillInStackTraceoverride avoids expensive JVM stack capture on error path.