Function build_grep_cmd

src/mcp/mcp.c:4490–4555

Build the grep/search command string based on scoped vs recursive mode. * On Windows, uses PowerShell Select-String with tab-delimited output. * On POSIX, uses grep with colon-delimited output. */

 * On Windows, uses PowerShell Select-String with tab-delimited output.
 * On POSIX, uses grep with colon-delimited output. */
static void build_grep_cmd(char *cmd, size_t cmd_sz, bool use_regex, bool scoped,
                           const char *file_pattern, const char *tmpfile, const char *filelist,
                           const char *root_path) {
#ifdef _WIN32
    const char *sm = use_regex ? "" : " -SimpleMatch";
    if (scoped) {
        if (file_pattern) {
            snprintf(
                cmd, cmd_sz,
                "powershell -Command \"$pat = Get-Content '%s'; "
                "Get-Content '%s' | ForEach-Object { Select-String -LiteralPath $_ -Pattern $pat%s "
                "-ErrorAction SilentlyContinue }"
                " | Where-Object { $_.Path -like '*%s' }"
                " | ForEach-Object { $_.Path + [char]9 + $_.LineNumber + [char]9 + $_.Line }\"",
                tmpfile, filelist, sm, file_pattern);
        } else {
            snprintf(
                cmd, cmd_sz,
                "powershell -Command \"$pat = Get-Content '%s'; "
                "Get-Content '%s' | ForEach-Object { Select-String -LiteralPath $_ -Pattern $pat%s "
                "-ErrorAction SilentlyContinue }"
                " | ForEach-Object { $_.Path + [char]9 + $_.LineNumber + [char]9 + $_.Line }\"",
                tmpfile, filelist, sm);
        }
    } else {
        if (file_pattern) {
            snprintf(
                cmd, cmd_sz,
                "powershell -Command \"Get-ChildItem -Recurse -Path '%s\\*' -Include '%s' -File "
                "-ErrorAction SilentlyContinue"
                " | Select-String -Pattern (Get-Content '%s')%s -ErrorAction SilentlyContinue"
                " | ForEach-Object { $_.Path + [char]9 + $_.LineNumber + [char]9 + $_.Line }\"",
                root_path, file_pattern, tmpfile, sm);
        } else {
            snprintf(
                cmd, cmd_sz,
                "powershell -Command \"Get-ChildItem -Recurse -Path '%s\\*' -File -ErrorAction "
                "SilentlyContinue"
                " | Select-String -Pattern (Get-Content '%s')%s -ErrorAction SilentlyContinue"
                " | ForEach-Object { $_.Path + [char]9 + $_.LineNumber + [char]9 + $_.Line }\"",
                root_path, tmpfile, sm);
        }
    }
#else
    const char *flag = use_regex ? "-E" : "-F";
    if (scoped) {
        if (file_pattern) {
            /* -0: read NUL-separated paths from the filelist so paths containing
             * spaces stay one argument (issue #687). Pairs with the NUL separator
             * written by write_scoped_filelist. */
            snprintf(cmd, cmd_sz, "xargs -0 grep -Hn %s --include='%s' -f '%s' < '%s' 2>/dev/null",
                     flag, file_pattern, tmpfile, filelist);
        } else {
            snprintf(cmd, cmd_sz, "xargs -0 grep -Hn %s -f '%s' < '%s' 2>/dev/null", flag, tmpfile,
                     filelist);
        }
    } else {
        if (file_pattern) {