feat: initial implementation of uptodownbot

Telegram bot for downloading media from any site using yt-dlp.
Supports audio/video/both, quality selection, language picker,
container format selection, playlist pagination, progress updates,
per-user quotas, user preferences, download history, cancel at any step,
polling and webhook modes, proxy support, and SQLite persistence.

internal/dl/progress_test.go

@@ -0,0 +1,72 @@
+package dl
+
+import (
+	"math"
+	"testing"
+)
+
+func TestParseProgressLine(t *testing.T) {
+	tests := []struct {
+		line   string
+		pct    float64
+		speed  string
+		eta    string
+		hasRes bool
+	}{
+		{
+			line:   "[download]  45.2% of 123.45MiB at 2.34MiB/s ETA 00:45",
+			pct:    45.2,
+			speed:  "2.34MiB/s",
+			eta:    "00:45",
+			hasRes: true,
+		},
+		{
+			line:   "[download]  10.0% of ~500.00MiB at 1.50MiB/s ETA 05:30",
+			pct:    10.0,
+			speed:  "1.50MiB/s",
+			eta:    "05:30",
+			hasRes: true,
+		},
+		{
+			line:   "[download] 100.0% of 50.00MiB at 5.00MiB/s ETA 00:00",
+			pct:    100.0,
+			speed:  "5.00MiB/s",
+			eta:    "00:00",
+			hasRes: true,
+		},
+		{
+			line:   "[youtube] Extracting URL: https://example.com",
+			hasRes: false,
+		},
+		{
+			line:   "",
+			hasRes: false,
+		},
+		{
+			line:   "some random log line",
+			hasRes: false,
+		},
+	}
+	for _, tt := range tests {
+		got := parseProgressLine(tt.line)
+		if !tt.hasRes {
+			if got != nil {
+				t.Errorf("parseProgressLine(%q) = %+v, want nil", tt.line, got)
+			}
+			continue
+		}
+		if got == nil {
+			t.Errorf("parseProgressLine(%q) = nil, want result", tt.line)
+			continue
+		}
+		if math.Abs(got.pct-tt.pct) > 0.01 {
+			t.Errorf("parseProgressLine(%q).pct = %f, want %f", tt.line, got.pct, tt.pct)
+		}
+		if got.speed != tt.speed {
+			t.Errorf("parseProgressLine(%q).speed = %q, want %q", tt.line, got.speed, tt.speed)
+		}
+		if got.eta != tt.eta {
+			t.Errorf("parseProgressLine(%q).eta = %q, want %q", tt.line, got.eta, tt.eta)
+		}
+	}
+}