feat(rtk): add JS-native git-log filter (#2423)

Compress git log output via dedicated RTK filter: keep commit headers,
Author/Date, subject; drop body padding, decoration, embedded diff lines.
Wire into autodetect (git-log prioritized before git-diff) and registry.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/rtk/autodetect.js

@@ -1,9 +1,10 @@
 // Port of auto_detect_filter (rtk/src/cmds/system/pipe_cmd.rs:132-188) + JS extras
-// Order: git-diff → git-status → build-output → grep → find → tree → ls → search-list
-//        → read-numbered → dedup-log → smart-truncate → null
+// Detection order: git-log → git-diff → git-status → build-output → grep → find → tree → ls → search-list
+//                  → read-numbered → dedup-log → smart-truncate → null
 import { DETECT_WINDOW, READ_NUMBERED_MIN_HIT_RATIO, SMART_TRUNCATE_MIN_LINES } from "./constants.js";
 import { gitDiff } from "./filters/gitDiff.js";
 import { gitStatus } from "./filters/gitStatus.js";
+import { gitLog } from "./filters/gitLog.js";
 import { buildOutput } from "./filters/buildOutput.js";
 import { grep } from "./filters/grep.js";
 import { find } from "./filters/find.js";
@@ -17,6 +18,7 @@ import { searchList, SEARCH_LIST_HEADER_RE } from "./filters/searchList.js";
 const RE_GIT_DIFF = /^diff --git /m;
 const RE_GIT_DIFF_HUNK = /^@@ /m;
 const RE_GIT_STATUS = /^On branch |^nothing to commit|^Changes (not |to be )|^Untracked files:/m;
+const RE_GIT_LOG = /^[*|/\\ ]*commit [0-9a-f]{7,40}$/m;
 const RE_PORCELAIN = /^[ MADRCU?!][ MADRCU?!] \S/m;
 const RE_BUILD_OUTPUT = /^(npm (warn|error|ERR!)|yarn (warn|error)|\s*Compiling\s+\S+|\s*Downloading\s+\S+|added \d+ package|\[ERROR\]|BUILD (SUCCESS|FAILED)|\s*Finished\s+|Successfully (installed|built)|ERROR:)/im;
 const RE_TREE_GLYPH = /[├└]──|│  /;
@@ -27,6 +29,7 @@ export function autoDetectFilter(text) {
   // Rust: floor_char_boundary to avoid UTF-8 split — JS .slice() by char is safe
   const head = text.length > DETECT_WINDOW ? text.slice(0, DETECT_WINDOW) : text;
 
+  if (RE_GIT_LOG.test(head)) return gitLog;
   if (RE_GIT_DIFF.test(head) || RE_GIT_DIFF_HUNK.test(head)) return gitDiff;
   if (RE_GIT_STATUS.test(head)) return gitStatus;
 

open-sse/rtk/constants.js

@@ -4,6 +4,7 @@ export const MIN_COMPRESS_SIZE = 500;          // bytes; skip tiny blobs
 export const DETECT_WINDOW = 1024;             // autodetect peeks first N chars
 export const GIT_DIFF_HUNK_MAX_LINES = 100;    // per-hunk line cap
 export const GIT_DIFF_CONTEXT_KEEP = 3;        // context lines around changes
+export const GIT_LOG_MAX_LINES = 200;          // gitLog line cap
 export const DEDUP_LINE_MAX = 2000;            // dedupLog truncation cap
 
 // Rust pipe_cmd.rs parity caps

open-sse/rtk/filters/gitLog.js

@@ -0,0 +1,99 @@
+// JS-native git-log filter
+// Compresses `git log` output: keeps commit headers, subjects, Author/Date;
+// drops body padding, decoration, embedded diff lines.
+import { GIT_LOG_MAX_LINES } from "../constants.js";
+
+export function gitLog(text, maxLines = GIT_LOG_MAX_LINES) {
+  if (!text) return "";
+
+  const input = String(text);
+  const lines = input.split("\n");
+  const out = [];
+  let skipped = 0;
+  let inCommit = false;
+  let subjectSeen = false;
+
+  function pushLine(l) {
+    if (out.length < maxLines) {
+      out.push(l);
+      return true;
+    }
+    skipped++;
+    return false;
+  }
+
+  for (let i = 0; i < lines.length; i++) {
+    const raw = lines[i];
+    const line = raw.trimEnd();
+    const trimmed = line.trim();
+
+    // commit <sha> header — starts new commit entry
+    // Also matched with leading graph decoration (`*   commit abc1234...` — --graph without --oneline)
+    if (/^commit [0-9a-f]{7,40}$/i.test(trimmed) || /^[*|/\\ ]+commit [0-9a-f]{7,40}/i.test(trimmed)) {
+      inCommit = true;
+      subjectSeen = false;
+      pushLine(line);
+      continue;
+    }
+
+    if (inCommit) {
+      // Author / Date — keep as-is (already column 0 in raw, or graph-prefix stripped by commit-header match)
+      if (/^[*|/\\ ]*(Author|Date):/i.test(trimmed)) {
+        pushLine(trimmed);
+        continue;
+      }
+      // blank — skip
+      if (trimmed === "") continue;
+      // indented subject (4 spaces, optionally preceded by graph decoration) — first one is subject
+      if (!subjectSeen && /^[*|/\\ ]*    \S/.test(line)) {
+        pushLine("  Subject: " + trimmed);
+        subjectSeen = true;
+        continue;
+      }
+      // stat summary: "N file(s) changed, N insertions(+), N deletions(-)"
+      if (/^\d+ file\w* changed/.test(trimmed)) {
+        pushLine("  " + trimmed);
+        continue;
+      }
+      // embedded diff header — one-line marker
+      if (/^diff --git /.test(trimmed)) {
+        pushLine("  ... diff body omitted");
+        continue;
+      }
+      // everything else in commit body — drop
+      continue;
+    }
+
+    // Not in a commit block (--oneline / --graph modes):
+
+    // Graph decoration + sha + subject: "*|/\\ <sha7> <subject>"
+    const graphMatch = trimmed.match(/^[*|/\\ ]+([0-9a-f]{7,40}\s+.+)/i);
+    if (graphMatch) {
+      pushLine(graphMatch[1]);
+      continue;
+    }
+
+    // Plain oneline: "<sha7> <subject>"
+    if (/^[0-9a-f]{7,40}\s+/.test(trimmed)) {
+      pushLine(trimmed);
+      continue;
+    }
+
+    // Pure graph decoration (no sha) — drop
+    if (/^[*|/\\ ]+$/.test(trimmed) && /[*|/\\]/.test(trimmed)) {
+      continue;
+    }
+
+    // catch-all pass-through
+    pushLine(trimmed);
+  }
+
+  if (skipped > 0) out.push(`... (${skipped} more lines)`);
+
+  const result = out.join("\n");
+  if (!result && input) return input;
+  if (result.length > input.length) return input;
+  return result;
+}
+
+gitLog.filterName = "git-log";

open-sse/rtk/registry.js

@@ -1,6 +1,7 @@
 import { FILTERS } from "./constants.js";
 import { gitDiff } from "./filters/gitDiff.js";
 import { gitStatus } from "./filters/gitStatus.js";
+import { gitLog } from "./filters/gitLog.js";
 import { grep } from "./filters/grep.js";
 import { find } from "./filters/find.js";
 import { dedupLog } from "./filters/dedupLog.js";
@@ -13,6 +14,7 @@ import { searchList } from "./filters/searchList.js";
 const REGISTRY = {
   [FILTERS.GIT_DIFF]: gitDiff,
   [FILTERS.GIT_STATUS]: gitStatus,
+  [FILTERS.GIT_LOG]: gitLog,
   [FILTERS.GREP]: grep,
   [FILTERS.FIND]: find,
   [FILTERS.DEDUP_LOG]: dedupLog,