refactor: build one binary instead of a library and a binary

src/scripts/django.rs

@@ -1,4 +1,4 @@
-use std::fs::create_dir;
+use std::fs::{File, OpenOptions, create_dir};
 use std::io::Write;
 use std::path::{Path, PathBuf};
 
@@ -6,7 +6,6 @@ use anyhow::{Result, anyhow};
 
 use crate::compose::Compose;
 use crate::scripts::docker_compose;
-use crate::{create_file, safe_create_file};
 
 const DEBUG_TEMPLATE: &str = r#"from django.core.management.base import BaseCommand
 
@@ -89,3 +88,17 @@ pub fn shell() -> Result<()> {
 pub fn test() -> Result<()> {
     manage(&["test".to_string()])
 }
+
+fn safe_create_file(path: PathBuf) -> Result<File, std::io::Error> {
+    OpenOptions::new().write(true).create_new(true).open(path)
+}
+
+// truncate(false) keeps an existing file's contents, which is what callers creating
+// an empty __init__.py want
+fn create_file(path: PathBuf) -> Result<File, std::io::Error> {
+    OpenOptions::new()
+        .write(true)
+        .create(true)
+        .truncate(false)
+        .open(path)
+}