From cae6696c3e8a8ef76ff76ad71bf4ed43cae8a09a Mon Sep 17 00:00:00 2001
From: Eduard Urbach <admin@akyoto.dev>
Date: Tue, 17 Oct 2023 15:10:35 +0200
Subject: [PATCH] Added build command

---
 README.md              | 14 ++++++++----
 build/Build.go         | 34 ++++++++++++++++++++++++++++
 cli/Build.go           | 50 ++++++++++++++++++++++++++++++++++++++++++
 cli/Help.go            |  2 +-
 cli/System.go          |  5 -----
 cli_test.go            |  7 ++++--
 examples/hello/hello.q |  3 +++
 7 files changed, 103 insertions(+), 12 deletions(-)
 create mode 100644 build/Build.go
 create mode 100644 examples/hello/hello.q

diff --git a/README.md b/README.md
index 860cdd4..99d512d 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,12 @@
 
 A simple programming language.
 
+## Features
+
+* Fast compilation
+* High performance
+* Small binaries
+
 ## Installation
 
 ```shell
@@ -10,11 +16,11 @@ cd q
 go build
 ```
 
-## Features
+## Usage
 
-* Fast compilation
-* High performance
-* Small binaries
+```shell
+q build
+```
 
 ## License
 
diff --git a/build/Build.go b/build/Build.go
new file mode 100644
index 0000000..9a838b9
--- /dev/null
+++ b/build/Build.go
@@ -0,0 +1,34 @@
+package build
+
+import "path/filepath"
+
+// Build describes a compiler build.
+type Build struct {
+	ExecutableName  string
+	ExecutablePath  string
+	WriteExecutable bool
+}
+
+// New creates a new build.
+func New(directory string) (*Build, error) {
+	directory, err := filepath.Abs(directory)
+
+	if err != nil {
+		return nil, err
+	}
+
+	executableName := filepath.Base(directory)
+
+	build := &Build{
+		ExecutableName:  executableName,
+		ExecutablePath:  filepath.Join(directory, executableName),
+		WriteExecutable: true,
+	}
+
+	return build, nil
+}
+
+// Run parses the input files and generates an executable file.
+func (build *Build) Run() error {
+	return nil
+}
diff --git a/cli/Build.go b/cli/Build.go
index 5c7ea6e..19f7544 100644
--- a/cli/Build.go
+++ b/cli/Build.go
@@ -1,5 +1,55 @@
 package cli
 
+import (
+	"os"
+
+	"git.akyoto.dev/cli/q/build"
+	"git.akyoto.dev/cli/q/log"
+)
+
 func Build(args []string) int {
+	directory := "."
+
+	if len(args) > 0 {
+		directory = args[0]
+	}
+
+	stat, err := os.Stat(directory)
+
+	if err != nil {
+		log.Error.Println(err)
+		return 1
+	}
+
+	if !stat.IsDir() {
+		log.Error.Println("Build path must be a directory")
+		return 2
+	}
+
+	b, err := build.New(directory)
+
+	if err != nil {
+		log.Error.Println(err)
+		return 1
+	}
+
+	for i := 1; i < len(args); i++ {
+		switch args[i] {
+		case "--dry":
+			b.WriteExecutable = false
+
+		default:
+			log.Error.Printf("Unknown parameter: %s\n", args[i])
+			return 2
+		}
+	}
+
+	err = b.Run()
+
+	if err != nil {
+		log.Error.Println(err)
+		return 1
+	}
+
 	return 0
 }
diff --git a/cli/Help.go b/cli/Help.go
index 464cb35..87da5c3 100644
--- a/cli/Help.go
+++ b/cli/Help.go
@@ -9,5 +9,5 @@ func Help(args []string) int {
 	log.Error.Println("")
 	log.Error.Println("    build [directory]")
 	log.Error.Println("    system")
-	return 1
+	return 2
 }
diff --git a/cli/System.go b/cli/System.go
index 524e0fb..4bde621 100644
--- a/cli/System.go
+++ b/cli/System.go
@@ -10,13 +10,8 @@ import (
 func System(args []string) int {
 	line := "%-19s%s\n"
 
-	// Platform
 	log.Info.Printf(line, "Platform:", runtime.GOOS)
-
-	// Architecture
 	log.Info.Printf(line, "Architecture:", runtime.GOARCH)
-
-	// Go
 	log.Info.Printf(line, "Go:", runtime.Version())
 
 	// Directory
diff --git a/cli_test.go b/cli_test.go
index b99942f..c1aef37 100644
--- a/cli_test.go
+++ b/cli_test.go
@@ -14,9 +14,12 @@ func TestCLI(t *testing.T) {
 	}
 
 	tests := []cliTest{
-		{[]string{}, 1},
-		{[]string{"invalid"}, 1},
+		{[]string{}, 2},
+		{[]string{"invalid"}, 2},
 		{[]string{"system"}, 0},
+		{[]string{"build", "non-existing-directory"}, 1},
+		{[]string{"build", "examples/hello/hello.q"}, 2},
+		{[]string{"build", "examples/hello", "--invalid"}, 2},
 	}
 
 	for _, test := range tests {
diff --git a/examples/hello/hello.q b/examples/hello/hello.q
new file mode 100644
index 0000000..d974d48
--- /dev/null
+++ b/examples/hello/hello.q
@@ -0,0 +1,3 @@
+main() {
+
+}