[mousetrap/gnome3-wip: 201/240] Simplify the mt-* interface.

[Heidi Ellis <heidiellis src gnome org>]

commit 74d841c222f2098124bdf355deebc6792e688741
Author: Stoney Jackson <dr stoney gmail com>
Date:   Sat Jun 28 21:55:00 2014 -0400

    Simplify the mt-* interface.
    
    If a developer wants to use mt-*, there are only three command
    s/he has to deal with. Now `mt-make` is just a pass-through
    interface for make. The advantage of mt-* is that once it is
    in your path, you can run it from anywhere.
    
    * `mt-setup` - Source this to add bin/ to your path and define PREFIX.
    * `mt-configure` - Runs autogen.sh
    * `mt-make` - Runs make passing through command-line arguments.
    
    Here is a typical work-flow.
    
        $ cd mousetrap
        $ source bin/mt-setup
        $ mt-configure          # make the Makefile
        $ cd src/mousetrap
        $ vim something         # do some work
        $ mt-make check         # see if it passes unit-tests
        $ mt-make run           # try running it
        $ mt-make lint          # see how messy your code is
        $ mt-make clean         # clean up files generated by make
        $ git add ...
        $ git commit ...
        $ mt-make pristine      # clean up all files git is ignoring
                                # or not tracking

 bin/mt-configure |    9 +++++++++
 bin/mt-make      |    7 +++++++
 2 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/bin/mt-configure b/bin/mt-configure
index 12acebd..dc9ade5 100755
--- a/bin/mt-configure
+++ b/bin/mt-configure
@@ -1,8 +1,17 @@
 #!/usr/bin/env bash
+
 source "$(dirname "$0")/mt-define-mousetrap-home"
+
+if [ ! -f "$MOUSETRAP_HOME/configure.ac" ] ; then
+    echo "Could not find configure.ac"
+    exit 1
+fi
+
 (
     if [ -z "$PREFIX" ] ; then
         PREFIX="$("$MOUSETRAP_HOME/bin/mt-guess-prefix")"
+        echo "PREFIX is not defined... guessing $PREFIX"
+        echo "If this is not right, manually define PREFIX and re-run."
     fi
     cd "$MOUSETRAP_HOME"
     ./autogen.sh --prefix="$PREFIX"
diff --git a/bin/mt-make b/bin/mt-make
new file mode 100755
index 0000000..e23e4cf
--- /dev/null
+++ b/bin/mt-make
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+source "$(dirname "$0")/mt-define-mousetrap-home"
+
+(
+    cd "$MOUSETRAP_HOME"
+    make "$@"
+)