diff --git a/lib/lang/ga.js b/lib/lang/ga.js
new file mode 100644
index 0000000..9bfa696
--- /dev/null
+++ b/lib/lang/ga.js
@@ -0,0 +1,143 @@
+"use strict";
+
+// function join_with_shared_prefix(a, b, joiner) {
+//  let i = 0;
+
+//  while(i !== a.length &&
+//        i !== b.length &&
+//        a.charCodeAt(i) === b.charCodeAt(i))
+//   ++i;
+
+//  while(i && a.charCodeAt(i - 1) !== 32)
+//    --i;
+
+//  return a + joiner + b.slice(i);
+// }
+
+module.exports = {
+  "clear": "glan",
+  "no-precipitation": "ní bheidh frasaíocht ann",
+  "mixed-precipitation": "frasaíocht éagsúil",
+  "possible-very-light-precipitation": "seans ar frasaíocht an-éadrom",
+  "very-light-precipitation": "frasaíocht an-éadrom",
+  "possible-light-precipitation": "seans ar frasaíocht éadrom",
+  "light-precipitation": "frasaíocht éadrom",
+  "medium-precipitation": "frasaíocht",
+  "heavy-precipitation": "frasaíocht throm",
+  "possible-very-light-rain": "seans ar fearthainn an-éadrom",
+  "very-light-rain": "fearthainn an-éadrom",
+  "possible-light-rain": "seans ar fearthainn éadrom",
+  "light-rain": "fearthainn éadrom",
+  "medium-rain": "fearthainn",
+  "heavy-rain": "fearthainn throm",
+  "possible-very-light-sleet": "seans ar flichshneachta an-éadrom",
+  "very-light-sleet": "flichshneachta an-éadrom",
+  "possible-light-sleet": "seans ar flichshneachta éadrom",
+  "light-sleet": "flichshneachta éadrom",
+  "medium-sleet": "flichshneachta",
+  "heavy-sleet": "flichshneachta trom",
+  "possible-very-light-snow": "seans ar sneachta an-éadrom",
+  "very-light-snow": "sneachta an-éadrom",
+  "possible-light-snow": "seans ar sneachta éadrom",
+  "light-snow": "sneachta éadrom",
+  "medium-snow": "sneachta",
+  "heavy-snow": "sneachta trom",
+  "possible-thunderstorm": "seans ar stoirm thoirní",
+  "thunderstorm": "stoirm thoirní",
+  "light-wind": "laoithne éadrom",
+  "medium-wind": "laoithne mheasarth",
+  "heavy-wind": "laoithne láidir",
+  "low-humidity": "bogthaise íseal",
+  "high-humidity": "bogthaise ard",
+  "fog": "ceoch",
+  "light-clouds": "scamaill bhána",
+  "medium-clouds": "scamaill mheasartha",
+  "heavy-clouds": "scamaill throma",
+  "today-morning": "maidin inniu",
+  "later-today-morning": "níos déanaí ar maidin inniu",
+  "today-afternoon": "iarnóin inniu",
+  "later-today-afternoon": "níos déanaí ar iarnóin inniu",
+  "today-evening": "tráthnóna inniu",
+  "later-today-evening": "níos déanaí ar tráthnóna inniu",
+  "today-night": "anocht",
+  "later-today-night": "níos déanaí anocht",
+  "tomorrow-morning": "maidin amárach",
+  "tomorrow-afternoon": "iarnóin amárach",
+  "tomorrow-evening": "tráthnóna amárach",
+  "tomorrow-night": "oiche amárach",
+  "morning": "ar maidin",
+  "afternoon": "iarnóin",
+  "evening": "tráthnóna",
+  "night": "anocht",
+  "today": "inniu",
+  "tomorrow": "amárach",
+  "sunday": "Dé Domhnaigh",
+  "monday": "Dé Luain",
+  "tuesday": "Dé Máirt",
+  "wednesday": "Dé Céadaoin",
+  "thursday": "Déardaoin",
+  "friday": "Dé hAoine",
+  "saturday": "Dé Sathairn",
+  "next-sunday": "Dé Domhnaigh seo chugainn",
+  "next-monday": "Dé Luain seo chugainn",
+  "next-tuesday": "Dé Máirt seo chugainn",
+  "next-wednesday": "Dé Céadaoin seo chugainn",
+  "next-thursday": "Déardaoin seo chugainn",
+  "next-friday": "Dé hAoine seo chugainn",
+  "next-saturday": "Dé Sathairn seo chugainn",
+  "minutes": "$1 nóim.",
+  "fahrenheit": "$1\u00B0F",
+  "celsius": "$1\u00B0C",
+  "inches": "$1 orl.",
+  "centimeters": "$1 cm.",
+  "less-than": "< $1",
+  "and": "$1 agus $2",
+  "through": "$1 go dtí $2",
+  "with": "$1, le $2",
+  "range": "$1\u2013$2",
+  "parenthetical": "$1 ($2)",
+  "for-hour": "$1 ar feadh uair an chloig",
+  "starting-in": "$1 ag tosú i $2",
+  "stopping-in": "$1 ag stopadh i $2",
+  "starting-then-stopping-later": "$1 ag tosú i $2, ag stopadh i $3",
+  "stopping-then-starting-later": "$1 ag stopadh i $2, ag tosú arís i $3",
+  "for-day": "$1 ar feadh an lae",
+  "starting": "$1 ag tosú $2",
+  "until": "$1 ag stopadh $2",
+  "until-starting-again": "$1 ag stopadh $2, ag tosú arís $3",
+  "starting-continuing-until": "$1 ag tosú $2, ag stopadh $3",
+  "during": "$1 $2",
+  "for-week": "$1 ar feadh na seachtaine",
+  "over-weekend": "$1 ar feadh an deireadh seachtaine",
+  "temperatures-peaking": "an teocht dul chomh hard le $1 $2",
+  "temperatures-rising": "an teteocht dul chomh hard le $1 $2",
+  "temperatures-valleying": "an teocht dul chomh íseal le $1 $2",
+  "temperatures-falling": "an teocht dul chomh íseal le $1 $2",
+  // Capitalize the first letter of every word, except if that word is
+  // "and". (This is a very crude bastardization of proper English titling
+  // rules, but it is adequate for the purposes of this module.)
+  "title": function(str) {
+    return str.replace(/\S+/g, function(word) {
+      return word === "Agus" ?
+        word :
+        word.charAt(0).toUpperCase() + word.slice(1);
+    });
+  },
+  /* Capitalize the first word of the sentence and end with a period. */
+  "sentence": function(str) {
+    /* Capitalize. */
+    str = str.charAt(0).toUpperCase() + str.slice(1);
+
+    /* Add a period if there isn't already one. */
+    if(str.charAt(str.length - 1) !== ".")
+      str += ".";
+
+    return str;
+  },
+  "next-hour-forecast-status": "níl réamhaisnéise an uair seo chugainn $1 mar go bhfuil $2",
+  "unavailable": "ar fáil",
+  "temporarily-unavailable": "ar fáil i láthair na huaire",
+  "partially-unavailable": "ar fáil go hiomlán",
+  "station-offline": "gach stáisiún radair atá in aice láimhe as líne",
+  "station-incomplete": "bearnaí san fhaisnéis ó na stáisiúin radair atá in aice láimhe",
+};
diff --git a/test_cases/ga.json b/test_cases/ga.json
new file mode 100644
index 0000000..1833603
--- /dev/null
+++ b/test_cases/ga.json
@@ -0,0 +1,252 @@
+{
+  "Glan":
+    ["title", "clear"],
+
+  "Seans Ar Frasaíocht An-éadrom":
+    ["title", "possible-very-light-precipitation"],
+
+  "Frasaíocht An-éadrom":
+    ["title", "very-light-precipitation"],
+
+  "Seans Ar Frasaíocht Éadrom":
+    ["title", "possible-light-precipitation"],
+
+  "Frasaíocht Éadrom":
+    ["title", "light-precipitation"],
+
+  "Frasaíocht":
+    ["title", "medium-precipitation"],
+
+  "Frasaíocht Throm":
+    ["title", "heavy-precipitation"],
+
+  "Seans Ar Fearthainn An-éadrom":
+    ["title", "possible-very-light-rain"],
+
+  "Fearthainn An-éadrom":
+    ["title", "very-light-rain"],
+
+  "Seans Ar Fearthainn Éadrom":
+    ["title", "possible-light-rain"],
+
+  "Fearthainn Éadrom":
+    ["title", "light-rain"],
+
+  "Fearthainn":
+    ["title", "medium-rain"],
+
+  "Fearthainn Throm":
+    ["title", "heavy-rain"],
+
+  "Seans Ar Flichshneachta An-éadrom":
+    ["title", "possible-very-light-sleet"],
+
+  "Flichshneachta An-éadrom":
+    ["title", "very-light-sleet"],
+
+  "Seans Ar Flichshneachta Éadrom":
+    ["title", "possible-light-sleet"],
+
+  "Flichshneachta Éadrom":
+    ["title", "light-sleet"],
+
+  "Flichshneachta":
+    ["title", "medium-sleet"],
+
+  "Flichshneachta Trom":
+    ["title", "heavy-sleet"],
+
+  "Seans Ar Sneachta An-éadrom":
+    ["title", "possible-very-light-snow"],
+
+  "Sneachta An-éadrom":
+    ["title", "very-light-snow"],
+
+  "Seans Ar Sneachta Éadrom":
+    ["title", "possible-light-snow"],
+
+  "Sneachta Éadrom":
+    ["title", "light-snow"],
+
+  "Sneachta":
+    ["title", "medium-snow"],
+
+  "Sneachta Trom":
+    ["title", "heavy-snow"],
+
+  "Laoithne Mheasarth":
+    ["title", "medium-wind"],
+
+  "Laoithne Láidir":
+    ["title", "heavy-wind"],
+
+  "Ceoch":
+    ["title", "fog"],
+
+  "Scamaill Mheasartha":
+    ["title", "medium-clouds"],
+
+  "Scamaill Throma":
+    ["title", "heavy-clouds"],
+
+  "Bogthaise Íseal Agus Laoithne Éadrom":
+    ["title", ["and", "low-humidity", "light-wind"]],
+
+  "Fearthainn An-éadrom Agus Laoithne Láidir":
+    ["title", ["and", "very-light-rain", "heavy-wind"]],
+
+  "Bogthaise Ard Agus Scamaill Bhána":
+    ["title", ["and", "high-humidity", "light-clouds"]],
+
+  "Glan ar feadh uair an chloig.":
+    ["sentence", ["for-hour", "clear"]],
+
+  "Sneachta an-éadrom ag tosú i 35 nóim.":
+    ["sentence", ["starting-in", "very-light-snow", ["minutes", 35]]],
+
+  "Fearthainn éadrom ag stopadh i 15 nóim.":
+    ["sentence", ["stopping-in", "light-rain", ["minutes", 15]]],
+
+  "Flichshneachta trom ag tosú i 20 nóim., ag stopadh i 30 nóim.":
+    ["sentence",
+      ["starting-then-stopping-later",
+        "heavy-sleet",
+        ["minutes", 20],
+        ["minutes", 30]]],
+
+  "Fearthainn ag stopadh i 25 nóim., ag tosú arís i 8 nóim.":
+    ["sentence",
+      ["stopping-then-starting-later",
+        "medium-rain",
+        ["minutes", 25],
+        ["minutes", 8]]],
+
+  "Scamaill mheasartha ar feadh an lae.":
+    ["sentence", ["for-day", "medium-clouds"]],
+
+  "Flichshneachta an-éadrom ag tosú ar maidin.":
+    ["sentence", ["starting", "very-light-sleet", "morning"]],
+
+  "Laoithne mheasarth ag stopadh anocht.":
+    ["sentence", ["until", "medium-wind", "today-night"]],
+
+  "Frasaíocht throm ag stopadh iarnóin.":
+    ["sentence", ["until", "heavy-precipitation", "afternoon"]],
+
+  "Laoithne éadrom iarnóin.":
+    ["sentence", ["during", "light-wind", "afternoon"]],
+
+  "Sneachta níos déanaí ar tráthnóna inniu agus maidin amárach.":
+    ["sentence", ["during",
+      "medium-snow",
+      ["and", "later-today-evening", "tomorrow-morning"]]],
+
+  "Fearthainn throm ag stopadh níos déanaí ar maidin inniu, ag tosú arís tráthnóna inniu.":
+    ["sentence", ["until-starting-again",
+      "heavy-rain",
+      "later-today-morning",
+      "today-evening"]],
+
+  "Scamaill throma ag tosú tráthnóna, ag stopadh anocht.":
+    ["sentence", ["starting-continuing-until",
+      "heavy-clouds",
+      "evening",
+      "night"]],
+
+  "Flichshneachta éadrom níos déanaí ar iarnóin inniu agus ceoch maidin amárach.":
+    ["sentence", ["and",
+      ["during", "light-sleet", "later-today-afternoon"],
+      ["during", "fog", "tomorrow-morning"]]],
+
+  "Laoithne láidir ag tosú maidin inniu, ag stopadh iarnóin inniu agus flichshneachta maidin amárach.":
+    ["sentence", ["and",
+      ["starting-continuing-until",
+        "heavy-wind",
+        "today-morning",
+        "today-afternoon"],
+      ["during", "medium-sleet", "tomorrow-morning"]]],
+
+  "Scamaill throma ag tosú níos déanaí anocht agus sneachta trom iarnóin amárach.":
+    ["sentence", ["and",
+      ["starting", "heavy-clouds", "later-today-night"],
+      ["during", "heavy-snow", "tomorrow-afternoon"]]],
+
+  "Bogthaise íseal anocht agus frasaíocht éadrom ag tosú tráthnóna amárach, ag stopadh oiche amárach.":
+    ["sentence", ["and",
+      ["during", "low-humidity", "today-night"],
+      ["starting-continuing-until",
+        "light-precipitation",
+        "tomorrow-evening",
+        "tomorrow-night"]]],
+
+  "Sneachta (5 orl.) anocht.":
+    ["sentence", ["during",
+      ["parenthetical", "medium-snow", ["inches", 5]],
+      "night"]],
+
+  "Sneachta éadrom (2 cm.) níos déanaí ar maidin inniu.":
+    ["sentence", ["during",
+      ["parenthetical", "light-snow", ["centimeters", 2]],
+      "later-today-morning"]],
+
+  "Sneachta trom (8\u201312 orl.) ar feadh an lae.":
+    ["sentence", ["for-day",
+      ["parenthetical", "heavy-snow", ["inches", ["range", 8, 12]]]]],
+
+  "Sneachta (< 1 cm.) iarnóin.":
+    ["sentence", ["during",
+      ["parenthetical", "medium-snow", ["less-than", ["centimeters", 1]]],
+      "afternoon"]],
+
+
+  "Ní bheidh frasaíocht ann ar feadh na seachtaine, le an teocht dul chomh hard le 85\u00B0F amárach.":
+    ["sentence", ["with",
+      ["for-week", "no-precipitation"],
+      ["temperatures-peaking",
+        ["fahrenheit", 85],
+        "tomorrow"]]],
+
+  "Frasaíocht éagsúil ar feadh an deireadh seachtaine, le an teteocht dul chomh hard le 32\u00B0C Déardaoin.":
+    ["sentence", ["with",
+      ["over-weekend", "mixed-precipitation"],
+      ["temperatures-rising",
+        ["celsius", 32],
+        "thursday"]]],
+
+  "Fearthainn an-éadrom Dé Luain, le an teocht dul chomh íseal le 15\u00B0F Dé hAoine.":
+    ["sentence", ["with",
+      ["during", "very-light-rain", "monday"],
+      ["temperatures-valleying",
+        ["fahrenheit", 15],
+        "friday"]]],
+
+  "Sneachta éadrom Dé Máirt agus Dé Céadaoin seo chugainn, le an teocht dul chomh íseal le 0\u00B0C Dé Domhnaigh.":
+    ["sentence", ["with",
+      ["during", "light-snow", ["and", "tuesday", "next-wednesday"]],
+      ["temperatures-falling",
+        ["celsius", 0],
+        "sunday"]]],
+
+  "Frasaíocht inniu go dtí Dé Sathairn, le an teocht dul chomh hard le 100\u00B0F Dé Luain.":
+    ["sentence", ["with",
+      ["during",
+        "medium-precipitation",
+        ["through", "today", "saturday"]],
+      ["temperatures-peaking",
+        ["fahrenheit", 100],
+        "monday"]]],
+
+  "Seans ar stoirm thoirní Dé Céadaoin seo chugainn agus Déardaoin seo chugainn.":
+    ["sentence", ["during",
+      "possible-thunderstorm",
+        ["and", "next-wednesday", "next-thursday"]
+    ]],
+  "Níl réamhaisnéise an uair seo chugainn ar fáil i láthair na huaire mar go bhfuil gach stáisiún radair atá in aice láimhe as líne.":
+    ["sentence", ["next-hour-forecast-status", "temporarily-unavailable", "station-offline"]],
+
+  "Níl réamhaisnéise an uair seo chugainn ar fáil go hiomlán mar go bhfuil bearnaí san fhaisnéis ó na stáisiúin radair atá in aice láimhe.":
+    ["sentence", ["next-hour-forecast-status", "partially-unavailable", "station-incomplete"]],
+
+  "Níl réamhaisnéise an uair seo chugainn ar fáil mar go bhfuil gach stáisiún radair atá in aice láimhe as líne.":
+    ["sentence", ["next-hour-forecast-status", "unavailable", "station-offline"]]
+}