Photoshopの文字レイヤーをJSXで一括置換｜プレビューと複製で確認

#target photoshop
(function () {
    var FIND = "2025";
    var REPLACE = "2026";
    var DRY_RUN = true; // First count matches. Set false only after reviewing the result.
    if (app.documents.length === 0) { alert("Open a practice PSD first."); return; }
    if (!FIND.length || FIND === REPLACE) { alert("Use a non-empty, different search string."); return; }
    var source = app.activeDocument;
    // Changes are confined to an unsaved duplicate; the original stays open.
    var work = DRY_RUN ? source : source.duplicate(source.name + "-text-preview");
    var matchedLayers = 0, occurrences = 0, changedLayers = 0, skipped = 0, errors = [];
    function walk(layers, parentLocked) {
        for (var i = 0; i < layers.length; i++) {
            var layer = layers[i];
            var locked = parentLocked || layer.allLocked;
            if (layer.typename === "LayerSet") {
                walk(layer.layers, locked);
            } else if (layer.typename === "ArtLayer" && layer.kind === LayerKind.TEXT) {
                if (locked) { skipped++; continue; }
                try {
                    var text = layer.textItem.contents;
                    var parts = text.split(FIND);
                    if (parts.length > 1) {
                        matchedLayers++;
                        occurrences += parts.length - 1;
                        if (!DRY_RUN) {
                            layer.textItem.contents = parts.join(REPLACE);
                            changedLayers++;
                        }
                    }
                } catch (e) { errors.push(layer.name + ": " + e.message); }
            }
        }
    }
    walk(work.layers, false);
    alert((DRY_RUN ? "PREVIEW ONLY" : "UNSAVED DUPLICATE") +
        "\nMatched layers: " + matchedLayers + "\nOccurrences: " + occurrences +
        "\nChanged layers: " + changedLayers + "\nLocked text layers skipped: " + skipped +
        "\nErrors: " + errors.length + "\n" + errors.join("\n"));
}());