Globally replace text in several files: Difference between revisions

=={{header|Jsish}}==

'''For the demo, the code does not overwrite the samples, but creates a .new file.'''

<lang javascript>/* Global replace in Jsish */

if (console.args.length == 0) {

console.args.push('-');

}

/* For each file, globally replace "Goodbye London!" with "Hello New York!" */

var fn, data, changed;

for (fn of console.args) {

/* No args, or an argument of - uses "stdin" (a special Channel name) */

if (fn == 'stdin') fn = './stdin';

if (fn == '-') fn = 'stdin';

try {

data = File.read(fn);

/* Jsi supports the m multiline regexp flag */

changed = data.replace(/Goodbye London!/gm, 'Hello New York!');

if (changed != data) {

if (fn == 'stdin') fn = 'stdout'; else fn += '.new';

var cnt = File.write(fn, changed);

puts(fn + ":" + cnt, 'updated');

}

} catch(err) { puts(err, 'processing', fn); }

}</lang>

To meet the task specification, change

<lang javascript>if (fn == 'stdin') fn = 'stdout'; else fn += '.new';</lang>

to

<lang javascript>if (fn == 'stdin') fn = 'stdout';</lang>

removing the else clause. The code will then overwrite originals.

{{out}}

<pre>prompt$ cat one

Goodbye London! it was the slice.

Goodbye London, should still be here

And a little more Goodbye London! New York!

prompt$ jsish global-replace.jsi - <one

Hello New York! it was the slice.

Goodbye London, should still be here

And a little more Hello New York! New York!

stdout:115 updated</pre>