Merge remote-tracking branch 'upstream/master'

2 files changed, 126 insertions, 0 deletions

diff --git a/challenge-103/abigail/lua/ch-1.lua b/challenge-103/abigail/lua/ch-1.lua
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+++ b/challenge-103/abigail/lua/ch-1.lua
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+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-1.lua < input-file
+--
+
+--
+-- We're reading years from standard input, one year per line, outputting
+-- years from the sexagenary cycle [1]. This is slightly more than what
+-- the challenge ask; the challenge asks to output the heavenly stem [2],
+-- and the earthly branch [3]. But we also output its Yin/Yang.
+--
+-- [1] https://en.wikipedia.org/wiki/Sexagenary_cycle
+-- [2] https://en.wikipedia.org/wiki/Heavenly_Stems
+-- [3] https://en.wikipedia.org/wiki/Earthly_Branches
+--
+
+--
+-- Each of the cycles have been rotated so the first entry corresponds to
+-- the year 0 in the Proleptic Gregorian calendar. (We're using the
+-- convention of having a year 0, as per ISO 8601).
+-- That way, we can just mod the year with the number of entries, without
+-- first having to subtract something from the year.
+--
+-- The heavenly stems last for 2 years, so we just duplicate the entries.
+--
+
+local yin_yang         = {"Yang",   "Yin"};
+local heavenly_stems   = {"Metal",  "Metal",   "Water", "Water",
+                          "Wood",   "Wood",    "Fire",  "Fire",
+                          "Earth",  "Earth"};
+local earthly_branches = {"Monkey", "Rooster", "Dog",   "Pig",
+                          "Rat",    "Ox",      "Tiger", "Rabbit",
+                          "Dragon", "Snake",   "Horse", "Goat"};
+
+for line in io . lines () do
+    local year = tonumber (line)
+    io . write (yin_yang         [1 + (year % #yin_yang)],         " ",
+                heavenly_stems   [1 + (year % #heavenly_stems)],   " ",
+                earthly_branches [1 + (year % #earthly_branches)], "\n")
+end
diff --git a/challenge-103/abigail/lua/ch-2.lua b/challenge-103/abigail/lua/ch-2.lua
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+++ b/challenge-103/abigail/lua/ch-2.lua
@@ -0,0 +1,81 @@
+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-2.lua < input-file
+--
+
+--
+-- We're reading a start time, the current time, and a file name
+-- from STDIN, separated by white space. The file contains the
+-- tracks played.
+--
+
+for line in io . lines () do
+    local _, _, start_time, current_time, file_name =
+                line : find ("(%d+)%s+(%d+)%s+(%S+)")
+
+    --
+    -- Time difference in milliseconds
+    --
+    local time_diff  = (current_time - start_time) * 1000
+
+    local tracks     = {}
+    local total_time = 0
+
+    --
+    -- Read in the media file; store the results in the
+    -- table tracks.
+    --
+    for track in io . lines (file_name) do
+        local _, _, play_time, title = track : find ("(%d+),(.*)")
+        local record = {}
+        record [0] = play_time
+        record [1] = title
+        total_time = total_time + play_time
+        table . insert (tracks, record)
+    end
+
+    --
+    -- We're not interested in playing full loops.
+    --
+    time_diff = time_diff % total_time
+
+    --
+    -- Find the current track playing. If time_diff is less than the
+    -- play time of the track, this is the track currently playing. If
+    -- so, print the track name (with quotes, as given in the example --
+    -- although they don't belong there, as they're from the CSV encoding;
+    -- for that reason, we won't deescape anything else either). Otherwise
+    -- (track length is shorter than time_diff), we subtrack the length
+    -- of the track from time_diff, and continue checking the next track.
+    --
+    for _, track in ipairs (tracks) do
+        if   time_diff - track [0] < 0
+        then time_diff     =  math . floor  (time_diff / 1000)
+             local hours   =  math . floor  (time_diff / 3600)
+             local minutes =  math . floor ((time_diff % 3600) / 60)
+             local seconds =                 time_diff         % 60
+        
+             --
+             -- Format a time string
+             --
+             local time
+             if   hours > 0
+             then time = string .
+                         format ("%02d:%02d:%02d", hours, minutes, seconds)
+             else time = string .
+                         format (     "%02d:%02d",        minutes, seconds)
+             end
+             print (track [1])
+             print (time)
+             break
+        else time_diff = time_diff - track [0]
+        end
+    end
+end
+
+