docs: update for 0.38 (#233)

Author: dsherret

README.md

@@ -12,6 +12,7 @@ Cross platform shell tools for Deno inspired by [zx](https://github.com/google/z
    - Makes more code work on Windows.
    - Allows exporting the shell's environment to the current process.
    - Uses [deno_task_shell](https://github.com/denoland/deno_task_shell)'s parser.
+   - Has common commands built-in for better Windows support.
 1. Minimal globals or global configuration.
    - Only a default instance of `$`, but it's not mandatory to use this.
 1. No custom CLI.
@@ -27,8 +28,8 @@ import $ from "https://deno.land/x/dax/mod.ts";
 // run a command
 await $`echo 5`; // outputs: 5
 
-// more complex example outputting 1 to stdout and 2 to stderr
-await $`echo 1 && deno eval 'console.error(2);'`;
+// outputting 1 to stdout and running a sub process
+await $`echo 1 && deno run main.ts`;
 
 // parallel
 await Promise.all([
@@ -57,8 +58,8 @@ console.log(result.prop); // 5
 Get the result of stdout as bytes (makes stdout "quiet"):
 
 ```ts
-const result = await $`echo 'test'`.bytes();
-console.log(result); // Uint8Array(5) [ 116, 101, 115, 116, 10 ]
+const bytes = await $`gzip < file.txt`.bytes();
+console.log(bytes);
 ```
 
 Get the result of stdout as a list of lines (makes stdout "quiet"):
@@ -106,12 +107,31 @@ Piping to a `WritableStream`:
 await $`echo 1`.stdout(Deno.stderr.writable, { preventClose: true });
 ```
 
-Or to a file:
+To a file path:
 
 ```ts
 await $`echo 1`.stdout($.path("data.txt"));
 ```
 
+To a file:
+
+```ts
+using file = $.path("data.txt").openSync({ write: true, create: true });
+await $`echo 1`.stdout(file);
+```
+
+From one command to another:
+
+```ts
+const output = await $`echo foo && echo bar`
+  .pipe($`grep foo`)
+  .text();
+
+// or using a pipe sequence
+const output = await $`echo foo && echo bar | grep foo`
+  .text();
+```
+
 ### Providing arguments to a command
 
 Use an expression in a template literal to provide a single argument to a command:
@@ -159,6 +179,37 @@ const finalText = await $`echo ${result}`.text();
 console.log(finalText); // 1
 ```
 
+#### JavaScript objects to redirects
+
+You can also provide JavaScript objects to shell output redirects:
+
+```ts
+const buffer = new Uint8Array(2);
+await $`echo 1 && (echo 2 > ${buffer}) && echo 3`; // 1\n3\n
+console.log(buffer); // Uint8Array(2) [ 50, 10 ] (2\n)
+```
+
+Supported objects: `Uint8Array`, `PathRef`, `WritableStream`, function that returns a `WritableStream`, any object that implements `[$.symbols.writable](): WritableStream`
+
+Or input redirects:
+
+```ts
+// strings
+const data = "my data in a string";
+const bytes = await $`gzip < ${data}`;
+
+// paths
+const path = $.path("file.txt");
+const bytes = await $`gzip < ${path}`;
+
+// requests (this example does not make the request until after 5 seconds)
+const request = $.request("https://plugins.dprint.dev/info.json")
+  .showProgress(); // show a progress bar while downloading
+const bytes = await $`sleep 5 && gzip < ${request}`.bytes();
+```
+
+Supported objects: `string`, `Uint8Array`, `PathRef`, `RequestBuilder`, `ReadableStream`, function that returns a `ReadableStream`, any object that implements `[$.symbols.readable](): ReadableStream`
+
 ### Providing stdin
 
 ```ts
@@ -670,6 +721,17 @@ console.log(response.code);
 console.log(await response.json());
 ```
 
+Requests can be piped to commands:
+
+```ts
+const request = $.request("https://plugins.dprint.dev/info.json");
+await $`deno run main.ts`.stdin(request);
+
+// or as a redirect... this sleeps 5 seconds, then makes
+// request and redirects the output to the command
+await $`sleep 5 && deno run main.ts < ${request}`;
+```
+
 See the [documentation on `RequestBuilder`](https://deno.land/x/dax/src/request.ts?s=RequestBuilder) for more details. It should be as flexible as `fetch`, but uses a builder API (ex. set headers via `.header(...)`).
 
 ### Showing progress
@@ -703,6 +765,25 @@ await $`echo 1 && echo 2`;
 await $`echo 1 || echo 2`;
 ```
 
+Pipe sequences:
+
+```ts
+await $`echo 1 | deno run main.ts`;
+```
+
+Redirects:
+
+```ts
+await $`echo 1 > output.txt`;
+const gzippedBytes = await $`gzip < input.txt`.bytes();
+```
+
+Sub shells:
+
+```ts
+await $`(echo 1 && echo 2) > output.txt`;
+```
+
 Setting env var for command in the shell (generally you can just use `.env(...)` though):
 
 ```ts

mod.test.ts

@@ -1269,6 +1269,12 @@ Deno.test("input redirects with provided object", async () => {
     const output = await $`cat - < ${stream}`.text();
     assertEquals(output, text);
   }
+  // string
+  {
+    const text = "testing".repeat(1000);
+    const output = await $`cat - < ${text}`.text();
+    assertEquals(output, text);
+  }
   // bytes
   {
     const text = "testing".repeat(1000);
@@ -1361,6 +1367,14 @@ Deno.test("output redirect with provided object", async () => {
     await $`echo 1 > ${() => writableStream}`;
     assertEquals(chunks, [new Uint8Array([49, 10])]);
   }
+  {
+    assertThrows(
+      () => $`echo 1 > ${"test.txt"}`,
+      Error,
+      "Failed resolving expression in command. Cannot provide strings to output " +
+        "redirects. Did you mean to provide a path instead via the `$.path(...)` API?",
+    );
+  }
 });
 
 Deno.test("shebang support", async (t) => {

mod.ts

@@ -79,14 +79,15 @@ export type {
  *
  * Differences:
  *
- * 1. Minimal globals or global configuration.
- *    - Only a default instance of `$`, but it's not mandatory to use this.
- * 1. No custom CLI.
  * 1. Cross platform shell.
  *    - Makes more code work on Windows.
- *    - Uses [deno_task_shell](https://github.com/denoland/deno_task_shell)'s parser.
  *    - Allows exporting the shell's environment to the current process.
- * 1. Good for application code in addition to use as a shell script replacement
+ *    - Uses [deno_task_shell](https://github.com/denoland/deno_task_shell)'s parser.
+ *    - Has common commands built-in for better Windows support.
+ * 1. Minimal globals or global configuration.
+ *    - Only a default instance of `$`, but it's not mandatory to use this.
+ * 1. No custom CLI.
+ * 1. Good for application code in addition to use as a shell script replacement.
  * 1. Named after my cat.
  *
  * ## Example

src/command.ts

@@ -1252,8 +1252,17 @@ function templateInner(
         const expr = exprs[i];
         const inputOrOutputRedirect = detectInputOrOutputRedirect(text);
         if (inputOrOutputRedirect === "<") {
-          if (typeof expr === "string" || expr instanceof PathRef) {
+          if (expr instanceof PathRef) {
             text += templateLiteralExprToString(expr, escape);
+          } else if (typeof expr === "string") {
+            handleReadableStream(() =>
+              new ReadableStream({
+                start(controller) {
+                  controller.enqueue(new TextEncoder().encode(expr));
+                  controller.close();
+                },
+              })
+            );
           } else if (expr instanceof ReadableStream) {
             handleReadableStream(() => expr);
           } else if (expr?.[symbols.readable]) {
@@ -1303,7 +1312,7 @@ function templateInner(
             throw new Error("Unsupported object provided to input redirect.");
           }
         } else if (inputOrOutputRedirect === ">") {
-          if (typeof expr === "string" || expr instanceof PathRef) {
+          if (expr instanceof PathRef) {
             text += templateLiteralExprToString(expr, escape);
           } else if (expr instanceof WritableStream) {
             handleWritableStream(() => expr);
@@ -1349,6 +1358,10 @@ function templateInner(
                 );
               }
             });
+          } else if (typeof expr === "string") {
+            throw new Error(
+              "Cannot provide strings to output redirects. Did you mean to provide a path instead via the `$.path(...)` API?",
+            );
           } else {
             throw new Error("Unsupported object provided to output redirect.");
           }