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index.js
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index.js
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"use strict";
const name = "language-restructuredtext";
let disposables = null;
module.exports = {
activate(){
const {CompositeDisposable} = require("atom");
disposables = new CompositeDisposable();
disposables.add(
atom.commands.add("atom-text-editor", `${name}:fit-borders`, this.fitBorders.bind(this))
);
},
deactivate(){
if(disposables){
disposables.dispose();
disposables = null;
}
},
fitBorders(){
const editor = atom.workspace.getActiveTextEditor();
if(!editor) return;
editor.transact(125, () => {
let haveSelectedRegions = false;
for(const cursor of editor.getCursors())
cursor.selection.isEmpty()
? fitBordersAtCursor(cursor)
: (haveSelectedRegions = true);
if(haveSelectedRegions)
editor.mutateSelectedText(s => fitBordersInSelection(s), 75);
});
}
};
function fitBordersInSelection(selection){
const insetHeading = /((^|\n)([-=~`#"^+*:.'_])\3{2,})[ \t]*\n([ \t]*\S.*?)[ \t]*\n(\3{3,})[ \t]*(?=$|\n)/g;
const plainHeading = /((?:^|\n)[ \t]*\n)(\S.*?)[ \t]*\n(([-=~`#"^+*:.'_])\4{2,})[ \t]*(?=$|\n)/g;
const modifiedText = selection.getText()
.replace(insetHeading, (...args) => {
const [match, topLine, nl, borderStyle, titleText, bottomLine] = args;
const padding = titleText.match(/^ */)[0].length;
const newLength = titleText.length + padding;
const newBorder = borderStyle.repeat(newLength);
return `${nl}${newBorder}\n${titleText}\n${newBorder}`;
})
.replace(plainHeading, (...args) => {
const [match, blankLine, titleText, borderLine, borderStyle] = args;
const newLength = titleText.length;
const newBorder = borderStyle.repeat(newLength);
return `${blankLine}${titleText}\n${newBorder}`;
});
selection.insertText(modifiedText, {select: true});
}
function fitBordersAtCursor(cursor){
const {editor} = cursor;
const {scopes} = cursor.getScopeDescriptor();
const borderScope = "punctuation.definition.heading.restructuredtext";
if(-1 !== scopes.indexOf(borderScope)){
const position = cursor.getBufferPosition();
const numLines = editor.getLineCount();
const range = editor.bufferRangeForScopeAtPosition(borderScope, position);
const {row} = position;
const lines = [];
for(let i = -2; i < 3; ++i){
const offsetRow = row + i;
if(offsetRow < 0 || offsetRow >= numLines) continue;
const {scopes} = editor.tokenForBufferPosition({row: offsetRow, column: 0});
const isBorder = -1 !== scopes.indexOf(borderScope);
const text = editor.lineTextForBufferRow(offsetRow);
lines.push({isBorder, row: offsetRow, scopes, text});
}
// Cursor's located underneath a section heading
if(/\w/.test(lines[1].text) && lines[2].isBorder){
if(lines[0].isBorder)
fitInsetHeading(editor, [,,...lines]);
else{
const blankLine = /^[ \t]*$/.test(lines[0].text);
if(blankLine && /^\S/.test(lines[1].text))
fitPlainHeading(editor, lines);
}
}
// Cursor's located in the row above a heading
else{
if(row <= 3)
lines.unshift(...new Array(5 - lines.length));
if(/\w/.test(lines[3].text) && lines[2].isBorder && lines[4].isBorder)
fitInsetHeading(editor, lines);
}
}
}
function fitInsetHeading(editor, lines){
const topStyle = lines[2].text[0];
const bottomStyle = lines[4].text[0];
const titleText = lines[3].text;
if(topStyle !== bottomStyle) return;
editor.transact(75, () => {
const padding = titleText.match(/^ */)[0].length;
const newLength = titleText.replace(/[ \t]+$/, "").length + padding;
const scaledBorder = topStyle.repeat(newLength);
const rowRange = i => editor.bufferRangeForBufferRow(lines[i].row);
// Avoid adding an undo step if nothing changed.
if(scaledBorder === lines[2].text && scaledBorder === lines[4].text)
return editor.abortTransaction();
editor.buffer.setTextInRange(rowRange(2), scaledBorder);
editor.buffer.setTextInRange(rowRange(4), scaledBorder);
});
}
function fitPlainHeading(editor, lines){
const borderStyle = lines[2].text[0];
const titleText = lines[1].text;
editor.transact(75, () => {
const {length} = titleText.replace(/[ \t]+$/, "");
const scaled = borderStyle.repeat(length);
const range = editor.bufferRangeForBufferRow(lines[2].row);
if(scaled !== editor.buffer.getTextInRange(range))
editor.buffer.setTextInRange(range, scaled);
});
}