Initial command system

core/commands.go

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+package core
+import "github.com/urfave/cli"
+
+// Commands stores all the commands that packwiz can run. Append to this slice to add your own commands.
+var Commands []cli.Command
+

core/flags.go

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+package core
+import (
+	"github.com/urfave/cli"
+)
+
+// Flags stores common information passed as flags to the program.
+type Flags struct {
+	PackFile   string
+	ModsFolder string
+}
+
+// FlagsFromContext converts a CLI context (from commands) into a Flags struct, for use in helper functions.
+func FlagsFromContext(c *cli.Context) Flags {
+	return Flags{
+		c.GlobalString("pack-file"),
+		c.GlobalString("mods-folder"),
+	}
+}
+
+// CLIFlags is used internally to initialise the internal flags (easier to keep in one place)
+var CLIFlags = [...]cli.Flag{
+	cli.StringFlag{
+		Name:  "pack-file",
+		Value: "pack.toml",
+		Usage: "The modpack metadata file to use",
+	},
+	cli.StringFlag{
+		Name:  "mods-folder",
+		Value: "mods",
+		Usage: "The mods folder to use",
+	},
+}
+

core/index.go

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+package core

core/mod.go

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+package core
+
+import "github.com/BurntSushi/toml"
+
+// Mod stores metadata about a mod. This is written to a TOML file for each mod.
+type Mod struct {
+	metaFilename string
+	Name     string `toml:"name"`
+	FileName string `toml:"filename"`
+	Side     string `toml:"side"`
+	Optional bool   `toml:"optional"`
+	Download struct {
+		URL        string `toml:"url"`
+		HashFormat string `toml:"hash-format"`
+		Hash       string `toml:"hash"`
+	} `toml:"download"`
+	Update map[string]toml.Primitive
+}
+// The three possible values of Side (the side that the mod is on) are "server", "client", and "both".
+const (
+	ServerSide    = "server"
+	ClientSide    = "client"
+	UniversalSide = "both"
+)
+
+func (m Mod) Write() {
+
+}
+

core/resolve.go

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+package core
+import (
+	"path/filepath"
+	"strings"
+)
+
+// ModExtension is the file extension of the mod metadata files
+const ModExtension = ".toml"
+
+// ResolveMod returns the path to a mod file from it's name
+func ResolveMod(modName string, flags Flags) string {
+	fileName := strings.ToLower(strings.TrimSuffix(modName, ModExtension)) + ModExtension
+	return filepath.Join(flags.ModsFolder, fileName)
+}
+