diff --git a/cmd/fml/fml.go b/cmd/fml/fml.go
index 1e014d2..4e5df2d 100644
--- a/cmd/fml/fml.go
+++ b/cmd/fml/fml.go
@@ -1,48 +1,147 @@
 package main
 
 import (
+	"fmt"
 	"os"
+	"runtime"
 	"time"
 
 	"git.burning.moe/celediel/fml/internal/modlist"
 	"git.burning.moe/celediel/fml/internal/prompt"
 
 	"github.com/charmbracelet/log"
+	"github.com/urfave/cli/v2"
 )
 
-// TODO: set this per os to support Windows + Mac
-var modsdir string = os.Getenv("HOME") + "/.factorio/mods"
-var modlistfile string = modsdir + "/mod-list.json"
+type config struct {
+	modsdir, infile, outfile string
+	mods                     modlist.Modlist
+	clobber                  bool
+}
+
+var cfg config
+
+func getModsDirFromEnv() string {
+	var dir string
+
+	switch runtime.GOOS {
+	case "darwin":
+		dir = os.Getenv("HOME") + "/Library/Application Support/factorio/mods"
+	case "windows":
+		dir = os.Getenv("APPDATA") + "\\Factorio\\mods"
+	default:
+		fallthrough
+	case "linux":
+		dir = os.Getenv("HOME") + "/.factorio/mods"
+	}
+
+	return dir
+}
 
 func main() {
-	// load this from config or cli option or env or something
-	log.SetLevel(log.WarnLevel)
-	log.SetTimeFormat(time.TimeOnly)
-	log.SetReportCaller(true)
+	cfg = config{}
 
-	mods, err := modlist.ReadFromFile(modlistfile)
-	if err != nil {
-		log.Fatal(err)
+	app := &cli.App{
+		Name:    "fml",
+		Usage:   "very simple modlist editor for factorio",
+		Version: "v0.0.0",
+		Authors: []*cli.Author{{
+			Name:  "Lilian Jónsdóttir",
+			Email: "lilian.jonsdottir@gmail.com",
+		}},
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:  "log",
+				Usage: "Log level",
+				Value: "warn",
+			},
+			&cli.PathFlag{
+				Name:     "infile",
+				Aliases:  []string{"i"},
+				Required: false,
+				Usage:    "alternative mod-list.json to read",
+			},
+			&cli.PathFlag{
+				Name:     "outfile",
+				Aliases:  []string{"o"},
+				Required: false,
+				Usage:    "alternative mod-list.json to write",
+			},
+			&cli.BoolFlag{
+				Name:     "clobber",
+				Aliases:  []string{"c"},
+				Required: false,
+				Usage:    "overwrite specified infile",
+			},
+		},
+		Before: func(ctx *cli.Context) error {
+			// Setup logger
+			if lvl, err := log.ParseLevel(ctx.String("log")); err != nil {
+				log.SetLevel(log.WarnLevel)
+			} else {
+				log.SetLevel(lvl)
+			}
+			log.SetReportCaller(log.GetLevel() == log.DebugLevel)
+			log.SetTimeFormat(time.TimeOnly)
+
+			// Bool flags
+			cfg.clobber = ctx.Bool("clobber")
+
+			// Deal with in/out file
+			var in = ctx.String("infile")
+			var out = ctx.String("outfile")
+
+			cfg.modsdir = getModsDirFromEnv()
+			if in == "" {
+				cfg.infile = fmt.Sprintf("%s%c%s", cfg.modsdir, os.PathSeparator, "mod-list.json")
+			} else {
+				cfg.infile = in
+			}
+
+			if out == "" && in != "" && !cfg.clobber {
+				log.Fatal("Pass --clobber or -c to overwrite the input file!")
+			} else if out == "" {
+				cfg.outfile = cfg.infile
+			} else if out != "" {
+				cfg.outfile = out
+			}
+
+			return nil
+		},
+		Action: func(ctx *cli.Context) error {
+			var err error
+
+			cfg.mods, err = modlist.ReadFromFile(cfg.infile)
+			if err != nil {
+				return err
+			}
+
+			err = modlist.AddModsNotInList(cfg.modsdir, &cfg.mods)
+			if err != nil {
+				return err
+			}
+			selected, err := prompt.Show(&cfg.mods)
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			// TODO: handle this in a better way
+			// TODO: list intersections or something
+			cfg.mods.DisableAll()
+
+			cfg.mods.EnableMods(selected...)
+
+			err = modlist.WriteToFile(cfg.outfile, &cfg.mods)
+			if err != nil {
+				return err
+			}
+
+			log.Print("All done, bye!")
+			return nil
+		},
 	}
 
-	err = modlist.AddModsNotInList(modsdir, &mods)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	selected, err := prompt.Show(&mods)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	// TODO: handle this in a better way
-	// TODO: list intersections or something
-	mods.DisableAll()
-
-	mods.EnableMods(selected...)
-
-	err = modlist.WriteToFile(modlistfile, &mods)
-	if err != nil {
+	if err := app.Run(os.Args); err != nil {
 		log.Fatal(err)
 	}
 }
diff --git a/go.mod b/go.mod
index 1c2096d..487625e 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/charmbracelet/huh v0.3.0
 	github.com/charmbracelet/log v0.3.1
 	github.com/magefile/mage v1.15.0
+	github.com/urfave/cli/v2 v2.27.1
 )
 
 require (
@@ -16,6 +17,7 @@ require (
 	github.com/charmbracelet/bubbletea v0.25.0 // indirect
 	github.com/charmbracelet/lipgloss v0.9.1 // indirect
 	github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/go-logfmt/logfmt v0.6.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
@@ -26,6 +28,8 @@ require (
 	github.com/muesli/reflow v0.3.0 // indirect
 	github.com/muesli/termenv v0.15.2 // indirect
 	github.com/rivo/uniseg v0.4.4 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
 	golang.org/x/sync v0.4.0 // indirect
 	golang.org/x/sys v0.13.0 // indirect
diff --git a/go.sum b/go.sum
index c705d2d..fcd204a 100644
--- a/go.sum
+++ b/go.sum
@@ -16,6 +16,8 @@ github.com/charmbracelet/log v0.3.1 h1:TjuY4OBNbxmHWSwO3tosgqs5I3biyY8sQPny/eCMT
 github.com/charmbracelet/log v0.3.1/go.mod h1:OR4E1hutLsax3ZKpXbgUqPtTjQfrh1pG3zwHGWuuq8g=
 github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81 h1:q2hJAaP1k2wIvVRd/hEHD7lacgqrCPS+k8g1MndzfWY=
 github.com/containerd/console v1.0.4-0.20230313162750-1ae8d489ac81/go.mod h1:YynlIjWYF8myEu6sdkwKIvGQq+cOckRm6So2avqoYAk=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-logfmt/logfmt v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
@@ -45,8 +47,14 @@ github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJ
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.4 h1:8TfxU8dW6PdqD27gjM8MVNuicgxIjxpm4K7x4jp8sis=
 github.com/rivo/uniseg v0.4.4/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/urfave/cli/v2 v2.27.1 h1:8xSQ6szndafKVRmfyeUMxkNUJQMjL1F2zmsZ+qHpfho=
+github.com/urfave/cli/v2 v2.27.1/go.mod h1:8qnjx1vcq5s2/wpsqoZFndg2CE5tNFyrTvS6SinrnYQ=
+github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
+github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsrSj3ccvlPHLoLsHnpR27oXr4ZE984MbSER8=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
 golang.org/x/sync v0.4.0 h1:zxkM55ReGkDlKSM+Fu41A+zmbZuaPVbGMzvvdUPznYQ=