Adding QMake (Make-like) language.

Mostly because the file extension conflicts with that of Prolog.

lib/linguist/languages.yml

@@ -1296,6 +1296,12 @@ QML:
   color: "#44a51c"
   primary_extension: .qml
 
+QMake:
+  primary_extension: .pro
+  lexer: Text only
+  extensions:
+  - .pri
+
 R:
   type: programming
   color: "#198ce7"

samples/QMake/complex.pro

@@ -0,0 +1,30 @@
+# This QMake file is complex, as it usese
+# boolean operators and function calls
+
+QT += core gui
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+# We could use some OpenGL right now
+contains(QT_CONFIG, opengl) | contains(QT_CONFIG, opengles2) {
+   QT += opengl
+} else {
+   DEFINES += QT_NO_OPENGL
+}
+
+TEMPLATE = app
+win32 {
+    TARGET = BlahApp
+    RC_FILE = Resources/winres.rc
+}
+!win32 { TARGET = blahapp }
+
+# Let's add a PRI file!
+include(functions.pri)
+
+SOURCES += file.cpp
+
+HEADERS  += file.h
+
+FORMS    += file.ui
+
+RESOURCES += res.qrc

samples/QMake/functions.pri

@@ -0,0 +1,8 @@
+# QMake include file that calls some functions
+# and does nothing else...
+
+exists(.git/HEAD) {
+    system(git rev-parse HEAD >rev.txt)
+} else {
+    system(echo ThisIsNotAGitRepo >rev.txt)
+}

samples/QMake/qmake.script!

@@ -0,0 +1,2 @@
+#!/usr/bin/qmake
+message(This is QMake.)

samples/QMake/simple.pro

@@ -0,0 +1,17 @@
+# Simple QMake file
+
+CONFIG += qt
+QT += core gui
+TEMPLATE = app
+TARGET = simpleapp
+
+SOURCES += file.cpp \
+    file2.c \
+    This/Is/Folder/file3.cpp
+
+HEADERS += file.h \
+    file2.h \
+    This/Is/Folder/file3.h
+
+FORMS += This/Is/Folder/file3.ui \
+    Test.ui