Changelog

0.11.0

Added

ExAST.Index.plan/1, ExAST.Index.terms/1, and structural index plan structs for building external candidate indexes while keeping ExAST as the semantic verifier.
ExAST.Index.Terms.from_source/1, from_ast/1, from_pattern/1, and term signal classification helpers.
ExAST.Selector.requires_source?/1, requires_comments?/1, find_all/3, and match?/3 for source-aware selector planning and verification.
ExAST.Comments.extract/1 and ExAST.Comments.text/1 for comment extraction with source position metadata.
ExAST.Symbols.definitions/1 and ExAST.Symbols.references/1 for syntactic definition/reference extraction.
Symbol helpers for stable qualified names and optional BEAM-native MFA tuples: ExAST.Symbols.qualified_name/1, mfa/1, and matches?/2.
Indexing and code intelligence guide.

0.10.1

Fixed

Restored pipe-aware pattern matching after the 0.10.0 candidate prefilter optimization. Piped calls such as data |> Enum.map(fun) now match direct call patterns like Enum.map(_, _) again.

0.10.0

Added

ExAST.Patcher.find_many/3 for running multiple named AST pattern checks in a single traversal where possible, returning matches tagged with :pattern.
ExAST.search_many/3 for searching files with multiple named patterns while preserving search/3 options such as :limit.

Changed

Optimized repeated single-node pattern matching by compiling patterns once, normalizing candidate nodes once per traversal, and using conservative call signature prefilters for common local, remote, piped, and nested call patterns.

0.9.1

Changed

Restructured documentation: short README with topic-based guides (Getting Started, Pattern Language, Querying, CLI Reference, Diff)

0.9.0

Added

Capture guards — where/2 now accepts ^pin syntax to filter on captured values, similar to Ecto's parameter references:
```
from("Enum.take(_, count)")
|> where(match?({:-, _, [_]}, ^count))
```
Supports match?/2 for structural checks, plain comparisons (^event == :click), multi-capture expressions (^left == ^right), and composition with existing structural predicates.
Source text in match results — Patcher.find_all/3 now includes a :source field with the matched source snippet. nil for AST/zipper input.
Module attribute pattern matching — attribute names are now captureable:
```
Patcher.find_all(source, "@name Application.get_env(_, _)")
```
Previously @env Application.get_env(...) would not match a pattern with a different attribute name, even as a capture variable.

0.8.1

Fixed

CLI commands now handle closed stdout pipes cleanly, so commands like mix ex_ast.search ... | head no longer emit EPIPE writer crash messages.

0.8.0

Added

Comment predicates — queries can now filter by associated source comments with comment/1, comment_before/1, comment_after/1, comment_inside/1, and comment_inline/1. Comment matchers accept strings, regexes, and explicit text matchers like prefix/2, suffix/2, and text/2. CLI comment filters detect /.../ and ~r/.../ regex syntax.

0.7.0

Added

SQL-like query API via ExAST.Query: from/1, where/2, find/2, find_child/2, contains/1, inside/1, sibling predicates (follows/1, precedes/1, immediately_follows/1, immediately_precedes/1), positional predicates (first/0, last/0, nth/1), and boolean predicate combinators (any/1, all/1).
Selector alternatives — query starts can now accept a list of alternative patterns, e.g. from(["def _ do ... end", "defp _ do ... end"]).
Search limits and broad-query guard — ExAST.search/3 and mix ex_ast.search now support limit: n / --limit n and refuse unbounded from("_") searches unless allow_broad: true / --allow-broad is passed.
Query-style CLI flags — mix ex_ast.search and mix ex_ast.replace now support --contains, sibling filters (--follows, --precedes, --immediately-follows, --immediately-precedes), and position filters (--first, --last, --nth).

Fixed

Selector negation now works Ecto-style without import hacks — where(not ...) is rewritten by the selector DSL, so users no longer need import Kernel, except: [not: 1].
Search result rendering no longer fails when the current project formatter config references unavailable import_deps.
Selector descendant traversal now walks nested AST shapes reliably, fixing missed matches for remote calls nested inside assignments and control flow.
Alias-aware matching expands local alias directives so canonical remote-call patterns like AshPhoenix.Form.for_update(...) match alias-based call sites like Form.for_update(...).
Grouped alias handling now supports real-world forms such as alias Phoenix.Socket.{Broadcast, Message, Reply}.
Alias collection no longer misclassifies ordinary variables named alias as alias directives.

0.6.0

Added

CSS-like AST selectors — build relationship-aware selectors with ExAST.Selector:

import ExAST.Selector

pattern("defmodule _ do ... end")
|> descendant("def _ do ... end")
|> child("IO.inspect(_)")

Selector predicates — filter selected nodes with where/2 and Ecto-style not/1: parent/1, ancestor/1, has_child/1, has_descendant/1, and has/1.
CLI relationship filters for mix ex_ast.search and mix ex_ast.replace: --parent, --ancestor, --has-child, --has-descendant, --has, and corresponding --not-* flags.

0.5.0

Added

Ellipsis (...) — matches zero or more nodes in function args, lists, and block bodies: IO.inspect(...), foo(first, ..., last), def run(_) do ... end
~p sigil — compile-time pattern parsing via import ExAST.Sigil

0.4.0

Added

Syntax-aware diff — ExAST.diff/3, ExAST.diff_files/3, ExAST.apply_diff/1
- GumTree-inspired AST matching: functions matched by name/arity, nodes by kind/label/signature
- Edit classification: :insert, :delete, :update, :move
- Function reorder detection reported as :move edits
- Child suppression: edits covered by a parent update/insert/delete are rolled up
- Inline line-level diffs within updated nodes (Myers algorithm via List.myers_difference)
- Patch application: ExAST.apply_diff/1 produces patched source from a diff result
mix ex_ast.diff CLI task
- Colored output with -/+ markers (red/green, auto-detected)
- --no-color, --no-moves, --summary, --json flags
- Human-readable labels (def create/1 instead of {:def, :create, 1})
AST and zipper input — Patcher.find_all/3 and Patcher.replace_all/4 now accept source strings, Sourceror.Zipper, or raw AST as input. Source-string variants return strings, AST/zipper variants return AST.
Quoted expressions as patterns — patterns and replacements can be strings or quoted expressions:
```
Patcher.find_all(source, quote(do: IO.inspect(_)))
Patcher.replace_all(ast, quote(do: IO.inspect(expr)), quote(do: dbg(expr)))
```
inside/not_inside options also accept quoted.
Ellipsis (...) — matches zero or more nodes in args, lists, and block bodies. IO.inspect(...) matches any arity, foo(first, ..., last) captures surrounding args, def run(_) do ... end matches any body.
~p sigil — compile-time pattern parsing via import ExAST.Sigil: ~p"IO.inspect(...)" returns parsed AST with no runtime overhead.
ex_dna added to CI checks

0.3.0

Pipe awareness: data |> Enum.map(f) matches Enum.map(data, f)
Where conditions: --inside, --not-inside filters
Multi-node patterns: a = Repo.get!(_, _); Repo.delete(a)

0.2.0

Initial release with search and replace

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