Starlark lint API: no way to read the enabled project languages (strings() includes languages that are not enabled) #1306

1. mxcli version: v0.25.0 (2026-10-05T09:18:28Z) (Windows)
2. Mendix version: 11.12.5
Repro app: a fresh mxcli new app, built by the script below

3. Scenario

A Starlark lint rule cannot find out which languages the project has enabled. strings() returns one row per stored translation, also for a language the project does not enable: a fresh app with only en_US enabled already has nl_NL rows. Enabling nl_NL does not change anything a rule can see, and there is no builtin such as languages(). show settings does print the enabled languages, so mxcli reads them already. Related: #1262 (page title in the default language).

Self-contained repro, run in an empty directory:

#!/usr/bin/env bash
# Repro: a Starlark lint rule cannot tell which project languages are enabled. Needs mxcli.
set -e
cd "$(dirname "$0")"
export MXCLI_LOG_DIR="$PWD/logs"   # own log dir: the diag holds only this repro
P=Repro/Repro.mpr
mxcli new Repro --version 11.12.5 --skip-build > /dev/null
cat > step1.mdl <<'MDL'
mdl 1;
alter settings LANGUAGE add or modify 'nl_NL' (CheckCompleteness: true);
MDL
mkdir -p Repro/.claude/lint-rules
cat > Repro/.claude/lint-rules/langs.star <<'STAR'
RULE_ID = "DUMP002"
RULE_NAME = "dumpLanguages"
DESCRIPTION = "Print the languages a rule can see"
CATEGORY = "pages"
SEVERITY = "info"
REQUIRES = ["full"]

def check():
    seen = {}
    for s in strings():
        seen[s.language] = seen.get(s.language, 0) + 1
    return [violation(message = "strings() languages: %s" % sorted(seen.items()),
                      location = location(module = "MyFirstModule", document_type = "module", document_name = "MyFirstModule"))]
STAR
cat > Repro/.claude/lint-rules/enabled.star <<'STAR'
RULE_ID = "DUMP003"
RULE_NAME = "dumpEnabledLanguages"
DESCRIPTION = "Try to read the enabled project languages"
CATEGORY = "pages"
SEVERITY = "info"

def check():
    return [violation(message = "languages(): %s" % languages(),
                      location = location(module = "MyFirstModule", document_type = "module", document_name = "MyFirstModule"))]
STAR
echo "--- before: only en_US enabled"
mxcli -p $P -c "show settings" | grep -i language
mxcli lint -p $P -r DUMP002 2>/dev/null | grep 'ℹ'
mxcli -p $P exec step1.mdl
echo "--- after: nl_NL enabled"
mxcli -p $P -c "show settings" | grep -i language
mxcli lint -p $P -r DUMP002 2>/dev/null | grep 'ℹ'
mxcli lint -p $P -r DUMP003 2>&1 | grep -i 'languages\|error' || true

Output (progress lines left out; the local path is replaced by <repro>):

--- before: only en_US enabled
| Language Settings       | Default: en_US, enabled: en_US                            |
  ℹ strings() languages: [("en_US", 152), ("nl_NL", 124)] [DUMP002]
Connected to: Repro/Repro.mpr (Mendix 11.12.5)
Enabled language: nl_NL (2 enabled)
--- after: nl_NL enabled
| Language Settings       | Default: en_US, enabled: en_US, nl_NL                     |
  ℹ strings() languages: [("en_US", 152), ("nl_NL", 124)] [DUMP002]
Warning: rule file skipped: <repro>\Repro\.claude\lint-rules\enabled.star: failed to execute Starlark file: <repro>\Repro\.claude\lint-rules\enabled.star:8:53: undefined: languages (a builtin this mxcli does not have — the rule may need a newer mxcli)
Error: unknown rule id(s): DUMP003
  Starlark rules were loaded from <repro>\Repro\.claude\lint-rules.

4. Expected output

• A builtin languages() (and a catalog table LANGUAGES) with one row per enabled project language: code, is_default, check_completeness, the same data show settings prints.
• Alternative: an enabled field on each strings() row.

5. Experienced output

The rule output is identical before and after. A rule that calls languages() is skipped: undefined: languages (a builtin this mxcli does not have — the rule may need a newer mxcli).

Other spellings tried

• languages() → undefined: languages, see the output above.
• Counting the languages in strings() → includes nl_NL while it is not enabled, see the table.

6. AI bug report

mxcli diag of the repro run:

  Version:     v0.25.0
  Go:          go1.26.6 windows/amd64
  Sessions:    7 (last 7 days)
  Errors:      0 (last 7 days)

Session log of lint -p Repro/Repro.mpr -r DUMP003 (from mxcli diag --bundle):

{"time":"2026-10-06T13:29:52.2864594+02:00","level":"INFO","msg":"session_start","version":"v0.25.0","go":"go1.26.6","os":"windows","arch":"amd64","mode":"mxcli lint","args":["mxcli","lint","-p","Repro/Repro.mpr","-r","DUMP003"],"pid":33336,"parent_pid":""}
{"time":"2026-10-06T13:29:52.3751829+02:00","level":"INFO","msg":"execute","stmt_type":"RefreshCatalogStmt","stmt_summary":"refresh catalog","duration_ms":11}

The lint session logs no error: the rule with languages() is skipped with a warning on stderr only.

Why it matters

Common page checks work per enabled language: "every page title is translated into each enabled language" and "page titles follow a capitalisation convention in each language". Without the list of enabled languages, a rule either checks only the default language (page.title) or reports stale translations of a language the project no longer uses, and a missing translation for an enabled language that has no row at all cannot be found. Workaround: check only the default language.