Restore Rain's licence and copyright as defaults alongside the parameters - #144
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…ters `filePrefix`, `buildFileForContract` (both spellings) and `buildFileForTaggedContract` each gain an overload that takes neither `spdxLicenseIdentifier` nor `copyrightText` and applies `RAIN_SPDX_LICENSE_IDENTIFIER` and `RAIN_COPYRIGHT_TEXT`, two new exported constants holding this org's own values. The parameterised forms are unchanged, so a consumer outside the org still states its own header and #75 stays closed. Each defaulting overload is the parameterised one applied to the two constants and nothing else, so there is no second spelling of the header to drift, and the non-empty-single-line rule holds over the defaults like any other value. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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WalkthroughThe change adds Rain default SPDX and copyright constants, a default ChangesGenerated-file header defaults
Estimated code review effort: 2 (Simple) | ~15 minutes Merge Risk: 🔵 Low · up to The change is mergeable with explicit owner follow-up: the documentation currently tells external consumers to use a default that applies Rain's licence and copyright, which could lead other repositories to generate files with incorrect ownership metadata. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@src/lib/LibCodeGen.sol`:
- Around line 127-130: Update the documentation near the zero-argument overload
to state that external consumers call filePrefix(string,string) and provide
their own header values, rather than using the overload that inserts this
organization’s defaults.
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README.mdsrc/lib/LibCodeGen.solsrc/lib/LibFs.soltest/src/lib/LibCodeGen.filePrefix.t.soltest/src/lib/LibFs.buildFileForContract.t.soltest/src/lib/LibFs.buildFileForTaggedContract.t.sol
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"A consumer outside it calls this one" put two pronouns next to two competing antecedents: the sentence before it is about the overload taking no arguments, so "this one" reads as that overload rather than as the one the comment documents, which is the opposite instruction. CodeRabbit read it that way on #144. Behaviour is unchanged; the text now names the two argument overload as what a consumer in another org calls. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Human ruling, 2026-08-18: "we really need the base rain license in codegen, fine
that you paramatized it but you threw out the defaults".
#135, closing #75, made
LibCodeGen.filePrefixrequired-params-only and threadedspdxLicenseIdentifier/copyrightTextthroughLibFs.buildFileForContractandbuildFileForTaggedContract. The parameterisation is not relitigated here and noparameterised signature changes. A defaulting form is added beside it, so a Rain
repo gets Rain's header without passing it.
The API
Two exported file-level constants in
LibCodeGen.sol:and one defaulting overload on every entry point that takes the pair:
LibCodeGen.filePrefix()filePrefix(spdx, copyright)LibFs.buildFileForContract(vm, instance, contractName, body)LibFs.buildFileForContract(vm, instance, dir, contractName, body)dirformLibFs.buildFileForTaggedContract(vm, instance, tag, contractName, body)Arities are 0/2, 4/6, 5/7 and 5/7 respectively — every pair is distinguished by
argument count alone, so no call that resolves today resolves differently.
Why exported constants rather than literals inside the overloads
A consumer that threads the header down through its own build library — which is
what
rainlanguage/rain.deploydoes, and what #135's own reasoning says apublished intermediate library has to do — cannot use a defaulting overload at
all: it has to hand two values to its own writer. Without exported constants that
consumer restates the two strings, so the org's licence lives in as many places
as there are repos. Named, there is one definition and every use site is
greppable. Named
RAIN_*rather thanDEFAULT_*because whose licence it is, isthe load-bearing fact: a repo in another org that writes
RAIN_COPYRIGHT_TEXTis visibly claiming Rain's copyright, which is exactly the mistake #75 was filed
about.
Why the writers and not
filePrefixalonefilePrefixis not what a build script calls.script/Build.solcallsLibFs.buildFileForContract/buildFileForTaggedContract, and those callfilePrefixinternally. A default that stopped atfilePrefixwould leave everyactual generation still passing both values, which is the state the ruling
rejects.
Why all three writer entry points
The rule is "an entry point that takes the header has a form that defaults it".
Skipping the
diroverload would make it "…except that one", and a caller thatchose its own directory would be a caller that also has to state a licence for no
reason: the two are independent.
NatSpec
The old text argued for required parameters ("...are the calling project's to
state and are taken from the caller"), which is still true and is left standing.
What is added to it, on the parameterised form and on each defaulting form, is
which of the two a given consumer is: the defaulting form states this org's
values, which is a statement only a repo this org owns can make, and a consumer
elsewhere calls the form that takes them. The tagged form's doc adds that a
snapshot is frozen once written, so the header it lands with is the header it
keeps.
README.mdgains a## Generated file headersection saying the same thing forsomeone who reads the README rather than the source — including that
reuse lintin a foreign repo would pass a wrongly-defaulted header, because it checks the
tag is present rather than right.
Tests
Seven added, 275 -> 282.
LibCodeGen.filePrefix.t.soltestRainDefaultsExact— the two constants against their literals. They headevery generated file in every Rain repo, so a change to either rewrites
committed source org wide and has to land as a deliberate diff.
testFilePrefixDefaultEqualsExplicitRainValues— the pin the ruling asksfor:
filePrefix()equalsfilePrefix(RAIN_SPDX_LICENSE_IDENTIFIER, RAIN_COPYRIGHT_TEXT).testFilePrefixDefaultExact— and equals the literal header. Equality alone issatisfied by both sides being wrong together; this says which bytes they both
have to be.
testFilePrefixDefaultsAreAcceptedValues— both defaults are single-line andnon-empty, so the defaulting overload is reachable rather than a call that
always reverts.
LibFs.buildFileForContract.t.sol,LibFs.buildFileForTaggedContract.t.soltestBuildFileForContractDefaultHeaderIsRainsExplicitHeadertestBuildFileForContractInDirDefaultHeaderIsRainsExplicitHeadertestBuildFileForTaggedContractDefaultHeaderIsRainsExplicitHeaderEach writes the same instance twice — once through the defaulting overload, once
through the parameterised one naming the two constants — reads both files back,
and asserts they are equal and equal to the file rebuilt from the literal
header text. The literal is the oracle, per this suite's existing rule that the
expected content is never produced by calling
LibCodeGenback.Red then green
Every one of the seven fails on
b7120c5by construction — the symbols and theoverloads do not exist there:
Green on this head:
29 test suites, 282 tests passed, 0 failed, 0 skipped.Mutations
mutation-probeover the changed lines, baseline verified green at 282 first.8/8 KILLED, 0 survived, 0 no-run, 0 harness errors.
testFilePrefixDefaultExact,testRainDefaultsExactfilePrefix()passes the defaults in the wrong ordertestFilePrefixDefaultEqualsExplicitRainValues,testFilePrefixDefaultExactfilePrefix()default drifts by one characterbuildFileForContractdefault in the wrong ordertestBuildFileForContractDefaultHeaderIsRainsExplicitHeaderbuildFileForContractdefault drifts by one characterbuildFileForContractdirdefault in the wrong ordertestBuildFileForContractInDirDefaultHeaderIsRainsExplicitHeaderbuildFileForTaggedContractdefault in the wrong ordertestBuildFileForTaggedContractDefaultHeaderIsRainsExplicitHeaderM03–M08 are the swap the argument list invites: two adjacent
string memoryparameters, so a call that swaps them compiles and writes a file whose licence
tag carries the copyright holder. Each is caught by the test for its own entry
point and by nothing else, which is what those three tests were written for.
QA
testRainDefaultsExact,testFilePrefixDefaultEqualsExplicitRainValues,testFilePrefixDefaultExact,testFilePrefixDefaultsAreAcceptedValues,testBuildFileForContractDefaultHeaderIsRainsExplicitHeader,testBuildFileForContractInDirDefaultHeaderIsRainsExplicitHeader,testBuildFileForTaggedContractDefaultHeaderIsRainsExplicitHeader— eachfails on base
b7120c5by construction, verified by writing the tests firstand running
forge buildon the unmodified source:Error (2904): Declaration "RAIN_SPDX_LICENSE_IDENTIFIER" not found in "src/lib/LibCodeGen.sol"and the same forRAIN_COPYRIGHT_TEXT. Theconstants and the four overloads do not exist there, so no spelling of these
tests compiles against base.
mutation-probe, baseline verified green at 282 first,8/8 KILLED, 0 survived, 0 no-run, 0 harness errors.
LibCodeGen.sol:25RAIN_SPDX_LICENSE_IDENTIFIER = "LicenseRef-DCL-1.0"->"MIT"-> killed by all three writer tests +testFilePrefixDefaultExact+testRainDefaultsExact.LibCodeGen.sol:30RAIN_COPYRIGHT_TEXT->"Copyright (c) 2026 Someone Else"-> killed by the same five.LibCodeGen.sol:176filePrefix(RAIN_SPDX_LICENSE_IDENTIFIER, RAIN_COPYRIGHT_TEXT)-> arguments swapped -> killed bytestFilePrefixDefaultEqualsExplicitRainValues,testFilePrefixDefaultExact.LibCodeGen.sol:176-> copyright replaced by the same text plus a trailing.-> killed by the same two.LibFs.sol:459-> arguments swapped -> killed bytestBuildFileForContractDefaultHeaderIsRainsExplicitHeader.LibFs.sol:459-> licence replaced by"LicenseRef-DCL-1.1"-> killed by thesame.
LibFs.sol:558-> arguments swapped -> killed bytestBuildFileForContractInDirDefaultHeaderIsRainsExplicitHeader.LibFs.sol:653-> arguments swapped -> killed bytestBuildFileForTaggedContractDefaultHeaderIsRainsExplicitHeader.by calling
LibCodeGen.filePrefixback.expectedFilein bothLibFssuitesalready rebuilds the whole file from literals plus
address.codehash, and thenew tests use it;
testFilePrefixDefaultExactandtestRainDefaultsExactassert against literals directly. That is what makes
testFilePrefixDefaultEqualsExplicitRainValuesmeaningful rather thanself-referential: the equality says the two call paths agree, the literals say
which bytes they both have to be.
copyright available as defaults alongside the parameterised form, without
relitigating filePrefix() stamps this org's licence and copyright into other repos' generated files #75. Covered: the values exist as named exported constants
(
RAIN_SPDX_LICENSE_IDENTIFIER,RAIN_COPYRIGHT_TEXT); a defaulting formexists on every entry point that takes the pair, not just
filePrefix, so anactual build script benefits; every parameterised signature is byte-identical
to base, so filePrefix() stamps this org's licence and copyright into other repos' generated files #75 stays closed; NatSpec on both forms now says which consumer
calls which; the README states the same for a reader who does not open the
source. Not done, deliberately: nothing in
rainlanguage/rain.deployDocument the return value of every tooling builder #134,which the ruling puts out of scope.
Checks run locally, each of which CI also runs
forge test— 29 suites, 282 passed, 0 failed, 0 skippedforge fmt --check— cleanslither .— 9 contracts, 98 detectors, 0 resultsreuse lint— compliant with REUSE 3.3, 58/58 filesrainlanguage/rain.deploy#134Untouched, as ordered, and it does not need to change. Its threading of the two
values through
LibRainDeploySnapshotstays correct for the reason that PRgives:
rain-deployis itself published and consumed by deploy repos in otherorgs, so a defaulting call inside it would put Rain's header into their
append-only snapshots — the same defect one layer up.
One thing there could simplify:
script/Build.soldeclaresGENERATED_SPDX_LICENSE_IDENTIFIER/GENERATED_COPYRIGHT_TEXTas its own twoliterals, which are byte-identical to the constants this PR exports, so they
could become an import instead of a restatement. It is a judgement call rather
than an obvious win — that file's own NatSpec argues the opposite ("THIS repo's
licence, declared by THIS repo, which is the whole point of it being here"), and
importing couples rain.deploy's declared licence to a codegen bump. Worth a
separate decision, not a change to #134.
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Summary by CodeRabbit
New Features
Bug Fixes
Tests