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PhutilInteractiveEditor.php
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Fri, May 31, 10:36

PhutilInteractiveEditor.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Edit a document interactively, by launching $EDITOR (like vi or nano).
*
* $result = id(new InteractiveEditor($document))
* ->setName('shopping_list')
* ->setLineOffset(15)
* ->editInteractively();
*
* This will launch the user's $EDITOR to edit the specified '$document', and
* return their changes into '$result'.
*
* @task create Creating a New Editor
* @task edit Editing Interactively
* @task config Configuring Options
* @group console
*/
final class PhutilInteractiveEditor {
private $name = '';
private $content = '';
private $offset = 0;
private $fallback;
/* -( Creating a New Editor )---------------------------------------------- */
/**
* Constructs an interactive editor, using the text of a document.
*
* @param string Document text.
* @return $this
*
* @task create
*/
public function __construct($content) {
$this->setContent($content);
}
/* -( Editing Interactively )----------------------------------------------- */
/**
* Launch an editor and edit the content. The edited content will be
* returned.
*
* @return string Edited content.
* @throws Exception The editor exited abnormally or something untoward
* occurred.
*
* @task edit
*/
public function editInteractively() {
$name = $this->getName();
$content = $this->getContent();
$tmp = Filesystem::createTemporaryDirectory('edit.');
$path = $tmp.DIRECTORY_SEPARATOR.$name;
try {
Filesystem::writeFile($path, $content);
} catch (Exception $ex) {
Filesystem::remove($tmp);
throw $ex;
}
$editor = $this->getEditor();
$offset = $this->getLineOffset();
$err = $this->invokeEditor($editor, $path, $offset);
if ($err) {
Filesystem::remove($tmp);
throw new Exception("Editor exited with an error code (#{$err}).");
}
try {
$result = Filesystem::readFile($path);
Filesystem::remove($tmp);
} catch (Exception $ex) {
Filesystem::remove($tmp);
throw $ex;
}
$this->setContent($result);
return $this->getContent();
}
private function invokeEditor($editor, $path, $offset) {
if (phutil_is_windows()) {
$command_format = '%s';
} else {
$command_format = '%C';
}
// Special cases for known editors that don't obey the usual convention.
if (preg_match('/^mate/', $editor)) {
$cmd = csprintf(
$command_format.' -l %s %s',
$editor,
$offset,
$path);
} else {
$cmd = csprintf(
$command_format.' %s %s',
$editor,
'+'.$offset,
$path);
}
return phutil_passthru('%C', $cmd);
}
/* -( Configuring Options )------------------------------------------------- */
/**
* Set the line offset where the cursor should be positioned when the editor
* opens. By default, the cursor will be positioned at the start of the
* content.
*
* @param int Line number where the cursor should be positioned.
* @return $this
*
* @task config
*/
public function setLineOffset($offset) {
$this->offset = (int)$offset;
return $this;
}
/**
* Get the current line offset. See setLineOffset().
*
* @return int Current line offset.
*
* @task config
*/
public function getLineOffset() {
return $this->offset;
}
/**
* Set the document name. Depending on the editor, this may be exposed to
* the user and can give them a sense of what they're editing.
*
* @param string Document name.
* @return $this
*
* @task config
*/
public function setName($name) {
$name = preg_replace('/[^A-Z0-9._-]+/i', '', $name);
$this->name = $name;
return $this;
}
/**
* Get the current document name. See setName() for details.
*
* @return string Current document name.
*
* @task config
*/
public function getName() {
if (!strlen($this->name)) {
return 'untitled';
}
return $this->name;
}
/**
* Set the text content to be edited.
*
* @param string New content.
* @return $this
*
* @task config
*/
public function setContent($content) {
$this->content = $content;
return $this;
}
/**
* Retrieve the current content.
*
* @return string
*
* @task config
*/
public function getContent() {
return $this->content;
}
/**
* Set the fallback editor program to be used if the env variable $EDITOR
* is not available and there is no `editor` binary in PATH.
*
* @param string Command-line editing program (e.g. 'emacs', 'vi')
* @return $this
*
* @task config
*/
public function setFallbackEditor($editor) {
$this->fallback = $editor;
return $this;
}
/**
* Get the name of the editor program to use. The value of the environmental
* variable $EDITOR will be used if available; otherwise, the `editor` binary
* if present; otherwise the best editor will be selected.
*
* @return string Command-line editing program.
*
* @task config
*/
public function getEditor() {
$editor = getenv('EDITOR');
if ($editor) {
return $editor;
}
// Look for `editor` in PATH, some systems provide an editor which is
// linked to something sensible.
list($err) = exec_manual('which editor');
if (!$err) {
return 'editor';
}
if ($this->fallback) {
return $this->fallback;
}
list($err) = exec_manual('which nano');
if (!$err) {
return 'nano';
}
throw new Exception(
"Unable to launch an interactive text editor. Set the EDITOR ".
"environment variable to an appropriate editor.");
}
}

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