adding flags for color, and column width overrides

Author: mordof-work

cli.js

@@ -8,12 +8,15 @@ const { readFileSync } = require('fs')
 cli
 	.version(`0.1.0`)
 	.usage(`[options] <file1> <file2>`)
+	.option('--color', "Force color output ON")
+	.option('--no-color', "Force color output OFF")
+	.option('--columns [columns]', "Specify width output override.")
 	.on(`--help`, () => {
 		console.log(``)
 		console.log(`  Example:`)
 		console.log(``)
 		console.log(`    $ splitdiff file1 file2`)
-		console.log(`    $ git --no-pager diff file1 file2 | splitdiff`)
+		console.log(`    $ git --no-pager diff file1 file2 | splitdiff [options]`)
 		console.log(``)
 	})
 	.parse(process.argv)
@@ -34,17 +37,23 @@ try {
 		})
 		process.stdin.on('end', () => {
 			if(data !== '') {
-				console.log(splitPatch(data, {}))
+				let opts = {}
+
+				if(cli.columns){
+					opts.columns = cli.columns
+				}
+
+				console.log(splitPatch(data, opts))
 			}
 		})
 
-	} 
+	}
 	else {
 		console.log(
 			splitDiffStrings(
 				cli.args[0] + `\n\n` + readFileSync(cli.args[0], { encoding: `utf8` }),
 				cli.args[1] + `\n\n` + readFileSync(cli.args[1], { encoding: `utf8` }),
-				{ 
+				{
 					diffType: `diffLines`,
 					lineNumbers: true,
 					lineOffset: 2

index.js

@@ -2,10 +2,16 @@ const diff = require(`diff`)
 const chalk = require(`chalk`)
 const stripAnsi = require(`strip-ansi`)
 
-const terminalWidth = (process.stdout && process.stdout.columns) ? process.stdout.columns : 80
-const colwidth = Math.floor((terminalWidth) / 2)
+let terminalWidth = (process.stdout && process.stdout.columns) ? process.stdout.columns : 80
+let colwidth
 const bgColor = chalk.bgRgb(15, 15, 15)
 
+function updateColWidth(){
+	colwidth = Math.floor((terminalWidth) / 2)
+}
+
+updateColWidth()
+
 function repeatChar(char, times) {
 	let ret = ''
 	while(--times >= 0) ret += char
@@ -247,10 +253,15 @@ module.exports = {
 		return pair.combine()
 	},
 
-	splitPatch(patch) {
+	splitPatch(patch, options) {
 		let parsedPatch = diff.parsePatch(patch)
 		let output = []
 
+		if(options.columns){
+			terminalWidth = options.columns
+			updateColWidth()
+		}
+
 		for(let patch of parsedPatch) {
 
 			let pair = new Pair(
@@ -300,7 +311,7 @@ module.exports = {
 						pair.right.currentSourceLine = line
 						pair.right.drawLine(true)
 					}
-				} 
+				}
 
 				output.push(pair.combine())
 				output.push('')