Move main program to a subdir of 'cmd' so it go installs as 'sqlite_lint' instead of as 'cmd'

cmd/sqlite_lint/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/playfulpachyderm/sqlite-lint/pkg/checks"
+)
+
+const (
+	GREEN = "\033[0;32m"
+	RED   = "\033[0;31m"
+	RESET = "\033[0m"
+)
+
+func main() {
+	// Check if a filepath argument is provided
+	if len(os.Args) < 2 {
+		fmt.Println(RED + "Please provide a filepath as the first argument." + RESET)
+		os.Exit(1)
+	}
+
+	// Get the filepath from the first argument
+	filepath := os.Args[1]
+
+	fmt.Printf("-----------------\nLinting %s\n", filepath)
+
+	// Open the SQLite database
+	db, err := checks.OpenSchema(filepath)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	is_failure := false
+	// Execute each check against the database
+	for _, check := range checks.Checks {
+		// Checks can be disabled via Github config / environment variables
+		if !is_check_enabled(check) {
+			continue
+		}
+		results, err := check.Execute(db)
+		if err != nil {
+			panic(err)
+		}
+
+		// If there are results, print them as lint errors
+		if len(results) > 0 {
+			is_failure = true
+			fmt.Printf(RED+"Check '%s' failed:\n"+RESET, check.Name)
+			for _, result := range results {
+				fmt.Printf(RED+"- %s: %s.%s\n"+RESET, result.ErrorMsg, result.TableName, result.ColumnName)
+			}
+			fmt.Printf(RED+"Explanation: %s\n\n"+RESET, check.Explanation)
+		}
+	}
+	if is_failure {
+		fmt.Println(RED + "Errors found" + RESET)
+		os.Exit(1)
+	}
+	fmt.Println(GREEN + "Success" + RESET)
+}
+
+// github_actions_input_env_var converts an input name to the corresponding
+// environment variable name used by GitHub Actions.
+func github_actions_input_env_var(name string) string {
+	// GitHub normalizes both hyphens and underscores to underscores, then uppercases the name
+	normalized := strings.NewReplacer("-", "_", " ", "_").Replace(name)
+	return "INPUT_" + strings.ToUpper(normalized)
+}
+
+// Setting the environment variable INPUT_REQUIRE_NOT_NULL="false" disables the "require_not_null" check
+func is_check_enabled(c checks.Check) bool {
+	val, is_set := os.LookupEnv(github_actions_input_env_var(c.Name))
+	if !is_set {
+		// Enable all checks by default
+		return true
+	}
+	// Anything except "false" is true
+	return val != "false"
+}