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Add startindex option and per-pagecallback #43

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Add startindex option and per-pagecallback #43

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9b38c43
Add startindex option
agamemnus Mar 12, 2018
96fc566
Update README.md
agamemnus Mar 12, 2018
26064cf
Update pdf2img.js
agamemnus Mar 12, 2018
04b5429
Add a per-page processed callback inside async.eachSeries.
agamemnus May 9, 2018
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5 changes: 3 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -26,8 +26,9 @@ pdf2img.setOptions({
size: 1024, // default 1024
density: 600, // default 600
outputdir: __dirname + path.sep + 'output', // output folder, default null (if null given, then it will create folder name same as file name)
outputname: 'test', // output file name, dafault null (if null given, then it will create image name same as input name)
page: null // convert selected page, default null (if null given, then it will convert all pages)
outputname: 'test', // output file name, default null (if null given, then it will create image name same as input name)
page: null, // convert selected page, default null (if null given, then it will convert all pages)
startindex: 1 // index to start width, default 1 (if not present, will start at 0)
});

pdf2img.convert(input, function(err, info) {
Expand Down
61 changes: 30 additions & 31 deletions lib/pdf2img.js
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Expand Up @@ -11,7 +11,8 @@ var options = {
density: 600,
outputdir: null,
outputname: null,
page: null
page: null,
startindex: 1
};

var Pdf2Img = function() {};
Expand All @@ -23,6 +24,7 @@ Pdf2Img.prototype.setOptions = function(opts) {
options.outputdir = opts.outputdir || options.outputdir;
options.outputname = opts.outputname || options.outputname;
options.page = opts.page || options.page;
options.startindex = opts.startindex || options.startindex;
};

Pdf2Img.prototype.convert = function(input, callbackreturn) {
Expand Down Expand Up @@ -66,49 +68,46 @@ Pdf2Img.prototype.convert = function(input, callbackreturn) {

async.waterfall([
// Get pages count
function (callback) {
gm(input).identify("%p ", function (err, value) {
var pageCount = String(value).split(' ');

if (!pageCount.length) {
callback({
result: 'error',
message: 'Invalid page number.'
}, null);
} else {
// Convert selected page
if (options.page !== null) {
if (options.page < pageCount.length) {
callback(null, [options.page]);
} else {
callback({
result: 'error',
message: 'Invalid page number.'
}, null);
}
} else {
callback(null, pageCount);
}
}

})

},
function(callback) {
var cmd = 'gm identify -format "%p " "' + input + '"';
var execSync = require('child_process').execSync;
var pageCount = execSync(cmd).toString().match(/[0-9]+/g);

if (!pageCount.length) {
return callback({
result: 'error',
message: 'Invalid page number.'
}, null);
}

// Convert selected page
if (options.page !== null) {
if (options.page < pageCount.length) {
return callback(null, [options.page]);
} else {
return callback({
result: 'error',
message: 'Invalid page number.'
}, null);
}
}

return callback(null, pageCount);
},

// Convert pdf file
function(pages, callback) {
// Use eachSeries to make sure that conversion has done page by page
async.eachSeries(pages, function(page, callbackmap) {
var inputStream = fs.createReadStream(input);
var outputFile = options.outputdir + options.outputname + '_' + page + '.' + options.type;
var outputFile = options.outputdir + options.outputname + '_' + (+page + options.startindex - 1) + '.' + options.type;

convertPdf2Img(inputStream, outputFile, parseInt(page), function(error, result) {
if (error) {
return callbackmap(error);
}

stdout.push(result);
callbackreturn(null, {result: 'page_processed', message: result});
return callbackmap(error, result);
});
}, function(e) {
Expand Down