Switch from RACKET_EDITION=MINIMAL to RACKET_MINIMAL=1

Also:

- Only support it for 6.x and HEAD. Don't bother with 5.9x, and don't
  try to support textual (it's too different).

- For the minimal case, do the raco pkg install of rackunit in
  install-racket.sh. Can conditionally test, there. Also, easier for
  users than them having to do it in .travis.yml.

.travis.yml

@@ -29,22 +29,19 @@ env:
     - RACKET_VERSION=6.1.1
     - RACKET_VERSION=HEAD
     - RACKET_VERSION=SCOPE_SNAPSHOT
-    # Optionally supply RACKET_EDITION with the value FULL or MINIMAL.
-    # Defaults to FULL.
-    - RACKET_VERSION=5.3.4 RACKET_EDITION=MINIMAL
-    - RACKET_VERSION=5.3.5 RACKET_EDITION=MINIMAL
-    - RACKET_VERSION=5.92 RACKET_EDITION=MINIMAL
-    - RACKET_VERSION=6.0 RACKET_EDITION=MINIMAL
-    - RACKET_VERSION=6.1 RACKET_EDITION=MINIMAL
-    - RACKET_VERSION=6.1.1 RACKET_EDITION=MINIMAL
-    - RACKET_VERSION=HEAD RACKET_EDITION=MINIMAL
+    # Optionally, can also supply RACKET_MINIMAL=1. Only works for
+    # Racket 6.0+ or HEAD.
+    - RACKET_VERSION=6.0 RACKET_MINIMAL=1
+    - RACKET_VERSION=6.1 RACKET_MINIMAL=1
+    - RACKET_VERSION=6.1.1 RACKET_MINIMAL=1
+    - RACKET_VERSION=HEAD RACKET_MINIMAL=1
 
 # You may want to test against certain versions of Racket, without
 # having them count against the overall success/failure.
 matrix:
   allow_failures:
     - env: RACKET_VERSION=HEAD
-    - env: RACKET_VERSION=HEAD RACKET_EDITION=MINIMAL
+    - env: RACKET_VERSION=HEAD RACKET_MINIMAL=1
     - env: RACKET_VERSION=SCOPE_SNAPSHOT
   # Fast finish: Overall build result is determined as soon as any of
   # its rows have failed, or, all of its rows that aren't allowed to
@@ -66,7 +63,6 @@ before_script:
 
 # Here supply steps such as raco make, raco test, etc.
 script:
-  - raco pkg install --scope installation rackunit # in case minimal racket
   - raco test -x .
 
 # NOTE: If your repo is a Racket package with an info.rkt that

install-racket.sh

@@ -3,12 +3,8 @@
 
 set -e
 
-if [[ "$RACKET_EDITION" = "" ]]; then
-    RACKET_EDITION="FULL"
-fi
-
 if [[ "$RACKET_VERSION" = "HEAD" ]]; then
-    if [[ "$RACKET_EDITION" = "MINIMAL" ]]; then
+    if [[ "$RACKET_MINIMAL" = "1" ]]; then
         URL="http://plt.eecs.northwestern.edu/snapshots/current/installers/min-racket-current-x86_64-linux-precise.sh"
     else
         URL="http://plt.eecs.northwestern.edu/snapshots/current/installers/racket-test-current-x86_64-linux-precise.sh"
@@ -16,23 +12,15 @@ if [[ "$RACKET_VERSION" = "HEAD" ]]; then
 elif [[ "$RACKET_VERSION" = "SCOPE_SNAPSHOT" ]]; then
     URL="http://www.cs.utah.edu/~mflatt/tmp/scope-snapshot/installers/racket-6.2.900.3-x86_64-linux.sh"
 elif [[ "$RACKET_VERSION" = 5.9* ]]; then
-    if [[ "$RACKET_EDITION" = "MINIMAL" ]]; then
-        URL="http://mirror.racket-lang.org/installers/${RACKET_VERSION}/racket-minimal-${RACKET_VERSION}-x86_64-linux-ubuntu-quantal.sh"
-    else
-        URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket-${RACKET_VERSION}-x86_64-linux-ubuntu-quantal.sh"
-    fi
+    URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket-${RACKET_VERSION}-x86_64-linux-ubuntu-quantal.sh"
 elif [[ "$RACKET_VERSION" = 6.* ]]; then
-    if [[ "$RACKET_EDITION" = "MINIMAL" ]]; then
+    if [[ "$RACKET_MINIMAL" = "1" ]]; then
         URL="http://mirror.racket-lang.org/installers/${RACKET_VERSION}/racket-minimal-${RACKET_VERSION}-x86_64-linux-ubuntu-precise.sh"
     else
         URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket-${RACKET_VERSION}-x86_64-linux-ubuntu-precise.sh"
     fi
-else
-    if [[ "$RACKET_EDITION" = "MINIMAL" ]]; then
-        URL="http://mirror.racket-lang.org/installers/${RACKET_VERSION}/racket-textual/racket-textual-${RACKET_VERSION}-bin-x86_64-linux-debian-squeeze.sh"
-    else
-        URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket/racket-${RACKET_VERSION}-bin-x86_64-linux-debian-squeeze.sh"
-    fi
+else # 5.3.x
+    URL="http://download.racket-lang.org/installers/${RACKET_VERSION}/racket/racket-${RACKET_VERSION}-bin-x86_64-linux-debian-squeeze.sh"
 fi
 
 # Older .travis.yml files don't set $RACKET_DIR (the Racket install
@@ -64,4 +52,9 @@ no
 
 EOF
 
+if [[ "$RACKET_MINIMAL" = "1" ]]; then
+    echo "Minimal Racket: Installing rackunit package..."
+    raco pkg install --auto --scope installation rackunit
+fi
+
 exit 0