Node.js solution for week 103, part 2

2 files changed, 70 insertions, 0 deletions

diff --git a/challenge-103/abigail/README.md b/challenge-103/abigail/README.md
index 69c67fa04e..b645561bf2 100644
--- a/challenge-103/abigail/README.md
+++ b/challenge-103/abigail/README.md
@@ -127,6 +127,7 @@ Output:
 * [Bash](bash/ch-2.sh)
 * [C](c/ch-2.c)
 * [Lua](lua/ch-2.lua)
+* [Node.js](node/ch-2.js)
 * [Perl](perl/ch-2.pl)
 * [Python](python/ch-2.py)
 * [Ruby](ruby/ch-2.rb)
diff --git a/challenge-103/abigail/node/ch-2.js b/challenge-103/abigail/node/ch-2.js
new file mode 100644
index 0000000000..31ed400038
--- /dev/null
+++ b/challenge-103/abigail/node/ch-2.js
@@ -0,0 +1,69 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-2.js < input-file
+//
+
+const fs       = require ('fs')
+const readline = require ('readline')
+const printf   = require ('printf')
+
+readline . createInterface ({input: process . stdin})   
+         . on ('line', _ => main (... _ . split (" ")))
+
+function main (start_time, current_time, file_name) {
+    let time_diff = (current_time - start_time) * 1000;
+
+    //
+    // Read in the media file, into an array tracks.
+    // Calculate the total time of playing all the tracks.
+    //
+    let tracks = require ("fs") . readFileSync (file_name)
+                                . toString ()
+                                . split ("\n")
+                                . filter (_ => _ . length)
+                                . map (_ => _ . split (",", 2))
+                                . map (_ => [+_ [0], _ [1]])
+    let total_time = 0;
+    tracks . forEach (_ => total_time += _ [0])
+
+    //
+    // Don't care about full loops
+    //
+    time_diff %= total_time
+
+    //
+    // Find the right track and print it.
+    //
+    done = 0
+    tracks . forEach (track => {
+        if (!done) {
+            if (time_diff - track [0] < 0) {
+                console . log (track [1])
+                time_diff   = Math . floor  (time_diff / 1000)
+                let hours   = Math . floor  (time_diff / 3600)
+                let minutes = Math . floor ((time_diff % 3600) / 60)
+                let seconds =                time_diff         % 60
+
+                if (hours > 0) {
+                    console . log (
+                        printf ("%02d:%02d:%02d", hours, minutes, seconds)
+                    )
+                }
+                else {
+                    console . log (
+                        printf (     "%02d:%02d",        minutes, seconds)
+                    )
+                }
+                done = 1  // There's no 'break' when using forEach
+            }
+            else {
+                time_diff -= track [0]
+            }
+        }
+    })
+}