Add doc explaining bun-create

examples/bun-create.md

@@ -1,4 +1,61 @@
 # `bun create`
 
-This folder 
+## Config
 
+The `bun-create` section of package.json is automatically removed from the final output. This lets you add create-only steps without installing an extra package.
+
+There are currently two options:
+
+- `postinstall`
+- `preinstall`
+
+They can be an array of strings or one string. An array of strings will be executed one after another.
+
+Here are examples:
+
+```
+{
+  "name": "@bun-examples/next",
+  "version": "0.0.31",
+  "main": "index.js",
+  "dependencies": {
+    "next": "11.1.2",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2",
+    "react-is": "^17.0.2"
+  },
+  "devDependencies": {
+    "@types/react": "^17.0.19",
+    "bun-framework-next": "^0.0.0-21",
+    "typescript": "^4.3.5"
+  },
+  "bun-create": {
+    "postinstall": [
+      "bun bun --use next"
+    ]
+  }
+}
+```
+
+By default, all commands run inside the environment exposed by the auto-detected npm client. This incurs a significant performance penalty, something like 150ms wasted on waiting for the npm client to start on each invocation.
+
+Any command that starts with `"bun "` will be run without npm.
+
+## How it works
+
+When you run `bun create ${template} ${destination}`, here's what happens:
+
+1. GET `registry.npmjs.org/@bun-examples/${template}/latest` and parse it
+2. GET `registry.npmjs.org/@bun-examples/${template}/-/${template}-${latestVersion}.tgz`
+3. Decompress & extract `${template}-${latestVersion}.tgz` into `${destination}`
+   3a. If there are files that would overwrite, warn and exit unless `--force` is passed
+4. Parse the `package.json`(again!), update `name` to be `${basename(destination)}`, remove the `bun-create` section from the `package.json` and save updated `package.json` to disk
+5. Auto-detect the npm client, preferring `pnpm`, `yarn` (v1), and lastly `npm`
+6. Run any tasks defined in `"bun-create": { "preinstall" }` with the npm client
+7. Run `${npmClient} install`
+8. Run any tasks defined in `"bun-create": { "preinstall" }` with the npm client
+9. Run `git init; git add -A .; git commit -am "Initial Commit";`.
+   8a. Rename `gitignore` to `.gitignore`. NPM automatically removes `.gitignore` files from appearing in packages.
+10. Done
+
+`../misctools/publish-examples.js` publishes all examples to npm.

src/cli.zig

@@ -519,7 +519,7 @@ pub const Command = struct {
 
         pub fn create(allocator: *std.mem.Allocator, log: *logger.Log, comptime command: Command.Tag) anyerror!Context {
             return Command.Context{
-                .args = if (comptime command != Command.Tag.CreateCommand)
+                .args = if (comptime command != Command.Tag.CreateCommand)  
                     try Arguments.parse(allocator, command)
                 else
                     std.mem.zeroes(Api.TransformOptions),

src/which.zig

@@ -5,7 +5,7 @@ fn isValid(buf: *[std.fs.MAX_PATH_BYTES]u8, segment: []const u8, bin: []const u8
     buf[segment.len] = std.fs.path.sep;
     std.mem.copy(u8, buf[segment.len + 1 ..], bin);
     buf[segment.len + 1 + bin.len ..][0] = 0;
-    var filepath = buf[0 .. segment.len + 1 + bin.len :0];
+    const filepath = buf[0 .. segment.len + 1 + bin.len :0];
 
     std.os.accessZ(filepath, std.os.X_OK) catch return null;
     return @intCast(u16, filepath.len);