feat: add --no-stdin documentation

fix ast-grep/ast-grep#491

website/guide/tooling-overview.md

@@ -24,7 +24,7 @@ Pressing `y` will accept the rewrite, `n` will skip it, `e` will open the file i
 
 Example:
 
-```
+```bash
 sg scan --interactive
 ```
 
@@ -125,6 +125,27 @@ You can invoke sg, the command-line interface for ast-grep, as a subprocess to s
 * For the `run` command, you must specify the language of the StdIn code with `--lang` or `-l` flag. For example: `echo "print('Hello world')" | sg run --lang python`. This is because ast-grep cannot infer code language without file extension.
 * Similarly, you can only `scan` StdIn code against _one single rule_, specified by `--rule` or `-r` flag. The rule must match the language of the StdIn code. For example: `echo "print('Hello world')" | sg scan --rule "python-rule.yml"`
 
+### Disable StdIn Mode
+
+Sometimes ast-grep is launched from another process, but you still need it to search files instead of parsing from StdIn.
+
+You can use ast-grep's command line argument `--no-stdin` to disable StdIn mode.
+The environment variable `AST_GREP_NO_STDIN` will also disable StdIn mode.
+
+
+For example, this shell script will start a live ast-grep session via fzf. Note `--no-stdin` is used here to prevernt ast-grep from searching standard input from fzf.
+
+```bash
+SG_PREFIX="sg run --color=always --no-stdin -p "
+INITIAL_QUERY="${*:-}"
+: | fzf --ansi --disabled --query "$INITIAL_QUERY" \
+    --bind "start:reload:$SG_PREFIX {q}" \
+    --bind "change:reload:sleep 0.1; $SG_PREFIX {q} || true" \
+    --delimiter : \
+    --preview 'bat --color=always {1} --highlight-line {2}' \
+    --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
+    --bind 'enter:become(vim {1} +{2})'
+```
 
 ## Colorful Output
 

website/reference/cli.md

@@ -25,11 +25,12 @@ sg run [OPTIONS] --pattern <PATTERN> [PATHS]...
 |   | --debug-query         |  Print query pattern's tree-sitter AST. Requires lang be set explicitly. |
 | -l| --lang `<LANG>`       |  The language of the pattern query. ast-grep will infer the language based on file extension if this option is omitted. |
 | -i| --interactive         |  Start interactive edit session. Code rewrite only happens inside a session. |
-|   |  --accept-all         |  Apply all rewrite without confirmation if true. |
+| -A|  --accept-all         |  Apply all rewrite without confirmation if true. |
 |   |  --json               |  Output matches in structured JSON text useful for tools like `jq`. Conflicts with interactive|
 |   |  --heading `<HEADING>` | Print file names before each file's matches. Default is auto: print heading for tty but not for piped output [default: auto] [possible values: always, never, auto] |
 |   |  --color `<COLOR>`     | Controls output color [default: auto] |
 |   |  --no-ignore `<NO_IGNORE>`  | Do not respect hidden file system or ignore files (.gitignore, .ignore, etc.). You can suppress multiple ignore files by passing `no-ignore` multiple times [possible values: hidden, dot, exclude, global, parent, vcs] |
+|   |  --no-stdin           | Disable search code from StdIn. See [link](/guide/tooling-overview.html#disable-stdin-mode) |
 |-h | --help                | Print help |
 
 ## scan
@@ -54,8 +55,9 @@ sg scan [OPTIONS] [PATHS]...
 | | --color `<COLOR>`|Controls output color [default: auto]|
 | | --report-style `<REPORT_STYLE>` | [default: rich] [possible values: rich, medium, short]
 | | --json |Output matches in structured JSON text. This is useful for tools like jq. Conflicts with color and report-style.|
-| | --accept-all | Apply all rewrite without confirmation |
+| -A | --accept-all | Apply all rewrite without confirmation |
 | | --no-ignore `<NO_IGNORE>` | Do not respect ignore files. You can suppress multiple ignore files by passing `no-ignore` multiple times [possible values: hidden, dot, exclude, global, parent, vcs] |
+|   |  --no-stdin           | Disable search code from StdIn. See [link](/guide/tooling-overview.html#disable-stdin-mode) |
 | -h| --help|Print help|
 
 ##   test