add dependency checker for whisper-cli and ffmpeg

internal/deps/deps.go

@@ -0,0 +1,64 @@
+package deps
+
+import (
+	"os/exec"
+	"strings"
+)
+
+// Status represents the installation status of a dependency
+type Status struct {
+	Installed bool
+	Path      string
+	Version   string
+}
+
+// CheckWhisperCli checks if whisper-cli is installed and returns its status
+func CheckWhisperCli() Status {
+	path, err := exec.LookPath("whisper-cli")
+	if err != nil {
+		return Status{Installed: false}
+	}
+
+	status := Status{
+		Installed: true,
+		Path:      path,
+	}
+
+	// try to get version - whisper-cli --version outputs version info
+	cmd := exec.Command(path, "--version")
+	output, err := cmd.Output()
+	if err == nil {
+		// parse first line as version
+		lines := strings.Split(string(output), "\n")
+		if len(lines) > 0 {
+			status.Version = strings.TrimSpace(lines[0])
+		}
+	}
+
+	return status
+}
+
+// CheckFFmpeg checks if ffmpeg is installed and returns its status
+func CheckFFmpeg() Status {
+	path, err := exec.LookPath("ffmpeg")
+	if err != nil {
+		return Status{Installed: false}
+	}
+
+	status := Status{
+		Installed: true,
+		Path:      path,
+	}
+
+	// ffmpeg -version outputs version info on first line
+	cmd := exec.Command(path, "-version")
+	output, err := cmd.Output()
+	if err == nil {
+		lines := strings.Split(string(output), "\n")
+		if len(lines) > 0 {
+			status.Version = strings.TrimSpace(lines[0])
+		}
+	}
+
+	return status
+}