Rename Tag...

script

// prompt for old and new tag and re-assign all instances of the first tag to the new one
let p = Prompt.create();
p.title = "Rename Tag"
p.message = "Enter old and new tag names. All drafts assigned the old tag will have that tag removed and the new tag added. Leave the new tag blank to simply remove all assignments of the old tag."

p.addTextField("oldTag", "Old tag", "", {
	"placeholder": "existing tag",
	"autocorrect": false,
	"autocapitalization": "none",
	"wantsFocus": true
});
p.addTextField("newTag", "New tag", "", {
	"placeholder": "tag to assign",
	"autocorrect": false,
	"autocapitalization": "none",
	"wantsFocus": true
});

p.addButton("Rename Tag");

if (p.show()) {
	let oldTag = p.fieldValues["oldTag"];
	let newTag = p.fieldValues["newTag"];

	let drafts = Draft.query("", "all", [oldTag]);
	if (drafts.length == 0) {
		alert("No drafts with tag \"" + oldTag + "\" found.");
	}
	else {
		let ct = 0;
		for (let d of drafts) {
			d.removeTag(oldTag);
			if (newTag.length > 0) {
				d.addTag(newTag);
			}
			d.update();
			ct++;
		}
		alert(ct + " draft(s) updated.");
	}
}