From 3840c436be9da689086b1d87247da19b17c1da48 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Tue, 12 Sep 2023 23:27:04 +0200
Subject: Missing or bad format error should be now more readable

---
 generate.lua | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/generate.lua b/generate.lua
index 02d46a8..8deaa68 100644
--- a/generate.lua
+++ b/generate.lua
@@ -5,5 +5,9 @@ Generates activity chart
 	<repos...>  (optional string)  Paths to repositories with activity
 ]]
 local activity = require "activity"
-local format = require("activity.formats." .. args.f)
-io.write(activity.generate_table(args.y, args.repos, format))
+local ok, maybe_format = pcall(require, "activity.formats." .. args.f)
+if not ok then
+	io.stderr:write(("couldn't find specified format: %q\n"):format(args.f))
+	os.exit(1)
+end
+io.write(activity.generate_table(args.y, args.repos, maybe_format))
-- 
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