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moongrep
Use moongrep to structurally search and perform taint analysis on MoonBit source code. Use when an agent needs syntax-aware MoonBit structural code search.
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SKILL.md
SKILL.md
moongrep
moongrep is an experimental MoonBit structural search and taint-analysis tool.
Matching rules are declared as YAML files.
Scan
Run the scanner with a rule directory and an optional scan target directory or
.mbt file:
moon runwasm moonbit-community/moongrep -- scan --rules path/to/rules path/to/src
moon runwasm moonbit-community/moongrep -- scan --pattern 'target()' path/to/src
moon runwasm moonbit-community/moongrep -- scan --pattern '$(callee:id)()' --guard '{$callee: "^safe_"}' path/to/srcSynopsis:
moon runwasm moonbit-community/moongrep -- scan [--verbose] [--enable-builtin-rules] [--exclude-dir <dir>...] ((--rules <rules-root> | --rules=<rules-root> | -r <rules-root> | --rule <rule-file>) | --pattern <pattern> [--guard <guard>])... [scan-root]The scanner is available through the scan subcommand. --rules / -r is
optional when --rule <rule-file> or at least one --pattern <pattern> is
supplied, or when --enable-builtin-rules is enabled. The long rules option
accepts both --rules <rules-root> and --rules=<rules-root> forms. Use
--rule <rule-file> to load exactly one YAML rule file. Inline patterns are
treated as anonymous structural rules whose rule id is the pattern string
itself. --enable-builtin-rules loads the embedded builtin rules in addition
to any rules and inline patterns supplied on the command line. One optional
positional scan-root may appear in the scan argument list and defaults to
.. If the rules or rule option appears multiple times, the last value wins.
Repeated --pattern values are appended as separate anonymous rules. Use
--guard <guard> after an anonymous --pattern to attach a YAML guard map with
$-prefixed metavariable keys, using the same schema as rule-file guard.
Use --exclude-dir <dir>... to skip directory names or paths while recursively
scanning the source tree. When passing multiple excluded directories after one
flag, put scan-root before --exclude-dir; repeated --exclude-dir <dir> and
--exclude-dir=<dir> forms are also accepted.
Usage errors print a message and exit with code 2: missing scan command,
missing all rule sources (--rules, --rule, --pattern, and
--enable-builtin-rules), missing option value, misplaced or malformed
--guard, unknown options, or more than one scan root. Non-usage errors,
including unreadable paths, an empty rules
directory, invalid YAML/schema/shape, or source read failures, abort the run;
the CLI prints the error and exits with code 1.
Pass --verbose to print loaded rule ids and the directory traversal progress
before warnings and match results.
Each match result prints the source line covered by the finding plus up to two
lines of surrounding source context. Surrounding context lines are rendered in
gray; matched source lines are rendered without gray styling. Set NO_COLOR=1
to disable gray context styling and render matched source lines with > instead
of |.
If scan-root is omitted, moongrep scans the current directory:
moon runwasm moonbit-community/moongrep -- scan --rules path/to/rules
moon runwasm moonbit-community/moongrep -- scan -r path/to/rules
moon runwasm moonbit-community/moongrep -- scan --rule path/to/rule.yaml
moon runwasm moonbit-community/moongrep -- scan --pattern 'target()'
moon runwasm moonbit-community/moongrep -- scan --pattern '$(callee:id)()' --guard '{$callee: "^safe_"}'
moon runwasm moonbit-community/moongrep -- scan --enable-builtin-rulesThe scanner recursively reads .mbt files. When descending from scan-root,
child entries named .git, _build, .mooncakes, or target are skipped; if
one of those directories is passed explicitly as scan-root, it is scanned.
Directories supplied through --exclude-dir are skipped by entry name anywhere
below scan-root, or by exact child path.
Symbolic links encountered during recursive source or rule traversal are
followed. Files that fail to parse are reported as warnings and skipped; other
files continue to be scanned.
Dump
MoonBit untyped_ast debug dumps are available through the dump subcommand:
moon runwasm moonbit-community/moongrep -- dump --impl 'fn answer { 42 }'
moon runwasm moonbit-community/moongrep -- dump --expr 'x + 1'Synopsis:
moon runwasm moonbit-community/moongrep -- dump (--impl <impl> | --expr <expr>)Use --impl <impl> to parse exactly one MoonBit top-level implementation item
and print its untyped_ast debug output. Use --expr <expr> to parse a
MoonBit expression and print its untyped_ast debug output. The options are
mutually exclusive, and one of them is required.
Usage errors, including missing both dump modes or combining --impl with
--expr, print a message and exit with code 2. Parse or lexical failures print
a message and exit with code 1.
Document
Embedded documentation is available through the docs subcommand:
moon runwasm moonbit-community/moongrep -- docs --list
moon runwasm moonbit-community/moongrep -- docs RuleSpecSkill
Versions
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