Let cot with - read from stdin (close #1171)

CHANGELOG.md

@@ -9,6 +9,7 @@
 - The new “prevent editing” option that prevents documents from being unintentionally edited.
 - Introduce the `--readonly` (`-r`) option to the `cot` command-line tool to open documents as read-only.
 - Introduce the new AppleScript parameter `editable` to document objects.
+- Read input from the standard input when the `cot` command-line tool is used with the `-` option.
 
 
 ### Improvements

CotEditor/Resources/CotEditor.help/Contents/Resources/en.lproj/pgs/about_cot.html

@@ -80,6 +80,11 @@ <h2>Examples</h2>
 <pre class="source"><code>cot --line -1 --column -1 foo.txt
 </code></pre>
 
+<p>Passing a dash (<code>-</code>) in place of filenames enters the mode to receive standard input. The input received will be opened as a new document.</p>
+
+<pre class="source"><code>cot -
+</code></pre>
+
 <p>You can also pipe a text. Then, CotEditor opens a new document with the piped text.</p>
 
 <pre class="source"><code>echo &quot;I am a dog but also a cow at the same time.&quot; | cot

CotEditor/Resources/CotEditor.help/Contents/Resources/ja.lproj/pgs/about_cot.html

@@ -81,6 +81,11 @@ <h2>例</h2>
 <pre class="source"><code>cot --line -1 --column -1 foo.txt
 </code></pre>
 
+<p>ファイル名の代わりにダッシュを渡すと、標準入力を受け取るモードになります。受け取った入力は新規書類として開かれます。</p>
+
+<pre class="source"><code>cot -
+</code></pre>
+
 <p>文字列をパイプで渡すこともできます。CotEditorは渡された文字列を新規書類として開きます。</p>
 
 <pre class="source"><code>echo &quot;I am a dog but also a cow at the same time.&quot; | cot

CotEditor/Resources/cot

@@ -291,7 +291,7 @@ def parse_args():
     args.new_window = args.new and not args.files
 
     # check file existence and create if needed
-    if args.files:
+    if args.files and args.files != ['-']:
         # strip symlink
         args.files = list(map(os.path.realpath, args.files))
         # skip file check if file is directory
@@ -402,10 +402,13 @@ if __name__ == "__main__":
     # parse arguments
     args = parse_args()
 
-    # read piped text if exists
-    if args.files or sys.stdin.isatty():
+    # read standard input if exists
+    if args.files == ['-']:
+        stdin = sys.stdin.read()
+        args.files = []
+    elif args.files or sys.stdin.isatty():
         stdin = None
-    else:
+    else:  # piped text
         stdin = ''.join(sys.stdin)
 
     main(args, stdin)