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fix(mcp): force grep filename prefix in scoped search_code

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build_grep_cmd's POSIX scoped path uses xargs to pass indexed files
to grep. When xargs supplies a single file, BSD/GNU grep omit the
filename from output by default (only added with multiple files),
yielding 'linenum:content' instead of the 'path:linenum:content'
that collect_grep_matches requires — matches were silently discarded
and search_code returned zero results.

Add -H so grep always prefixes the filename regardless of file count.
Harmless for the common multi-file case (output is unchanged), fixes
the single-indexed-file edge case exposed by the search_code_multi_word
test fixture.
This commit is contained in:
Martin Vogel
2026-05-19 23:43:42 +02:00
parent 03e01dc616
commit 32bb56ef3f
1 changed files with 2 additions and 2 deletions
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src/mcp/mcp.c
+2 -2
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@@ -3013,10 +3013,10 @@ static void build_grep_cmd(char *cmd, size_t cmd_sz, bool use_regex, bool scoped
const char *flag = use_regex ? "-E" : "-F";
if (scoped) {
if (file_pattern) {
snprintf(cmd, cmd_sz, "xargs grep -n %s --include='%s' -f '%s' < '%s' 2>/dev/null",
snprintf(cmd, cmd_sz, "xargs grep -Hn %s --include='%s' -f '%s' < '%s' 2>/dev/null",
flag, file_pattern, tmpfile, filelist);
} else {
snprintf(cmd, cmd_sz, "xargs grep -n %s -f '%s' < '%s' 2>/dev/null", flag, tmpfile,
snprintf(cmd, cmd_sz, "xargs grep -Hn %s -f '%s' < '%s' 2>/dev/null", flag, tmpfile,
filelist);
}
} else {