tools: Build all branches in Auto Build script

Sanatizes the branch name by replacing anything other than letters,
numbers, or period with a minus sign.  Didn't use underscore, so
that the filename itself can be easily split on underscore for
parsing its various components later.

tools/auto-build.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 if [ "$#" -eq 4 ] && [ "$4" == "-f" ]; then
+    # forceBuild will build all branches, whether or not there are changes
     forceBuild=true
 elif [ "$#" -ne 3 ]; then
     echo "Usage:"
@@ -10,41 +11,66 @@ else
     forceBuild=false
 fi
 
-#TODO: Loop through all branches
-currentBranch="master"
+# Look up all local and remote branches for comparison
+localBranches=($(git branch | awk -F ' +' '! /\(no branch\)/ {print $2}'))
+remoteBranches=($(git branch -r | awk -F ' origin/+' '! /\->/ {print $2}'))
 
-echo "Checking out branch '""$currentBranch""'"
-cmd="git checkout ""$currentBranch"; $cmd
-oldRevision=`git rev-parse --short HEAD`
+echo "Executing git fetch"
+git fetch --all
 
-echo "Executing git pull"
-git pull
-newRevision=`git rev-parse --short HEAD`
-
-if [ "$oldRevision" == "$newRevision" ] && [ "$forceBuild" == false ]; then
-    echo "Nothing new to build"
-    exit 0
-else
-    if [ "$forceBuild" == true ]; then
-        "Forcing auto-build"
+exitCode=0
+# Loop through the remote branches (these are the only ones that may have changed)
+for currentBranch in "${remoteBranches[@]}"; do
+    # Determine if the remote branch is not among the local branches
+    newBranch=true
+    for b in "${localBranches[@]}"; do
+        if [ "$b" == "$currentBranch" ]; then
+            newBranch=false
+        fi
+    done
+
+    echo "Checking out branch '""$currentBranch""'"
+    cmd="git checkout ""$currentBranch"; $cmd
+    if [ "$newBranch" == true ]; then
+        echo "New branch"
+        # Always build new branches ("(none)" won't match any revision number)
+        oldRevision="(none)"
+    else
+        oldRevision=`git rev-parse --short HEAD`
     fi
-    echo "Cleaning previous build"
-    ant clean
-    ndk-build clean
-    echo "Building APK"
-    ndk-build -j4
-    ant debug
-    if [ ! -f "bin/Mupen64Plus-debug.apk" ]; then
-        echo "Error: Build failed"
-        exit 1
+
+    echo "Executing git pull"
+    git pull
+    newRevision=`git rev-parse --short HEAD`
+
+    # Compare local and remote revision numbers, and build if there are changes
+    if [ "$oldRevision" == "$newRevision" ] && [ "$forceBuild" == false ]; then
+        echo "Nothing new to build"
     else
-        #TODO: Sanitize branch name for use in filename
-        sanitizedBranchName="$currentBranch"
-
-        echo "Uploading APK to host"
-        cmd="scp -v -i ""$3"" bin/Mupen64Plus-debug.apk ""$1"":""$2""/Mupen64PlusAE_""$sanitizedBranchName""_""$(date +'%Y%m%d%H%M')""_""$newRevision"".apk"; $cmd
-        echo "Done"
-        exit 0
+        if [ "$forceBuild" == true ]; then
+            "Forcing auto-build"
+        fi
+        echo "Cleaning previous build"
+        ant clean
+        ndk-build clean
+        echo "Building APK"
+        ndk-build -j4
+        ant debug
+        if [ ! -f "bin/Mupen64Plus-debug.apk" ]; then
+            echo "Error: Build failed"
+            # Exit with error code 1 when finished looping through the branches
+            exitCode=1
+        else
+            # Sanatize the branch name for use as part of the APK filename
+            sanitizedBranchName=${currentBranch//[^a-zA-Z0-9\.]/-}
+            echo "Uploading APK to host"
+            cmd="scp -v -i ""$3"" bin/Mupen64Plus-debug.apk ""$1"":""$2""/Mupen64PlusAE_""$sanitizedBranchName""_""$(date +'%Y%m%d%H%M')""_""$newRevision"".apk"; $cmd
+        fi
     fi
-fi
+done
+# Make sure 'master' branch is checked out next time this script is executed from crontab
+echo "Switching back to branch 'master'"
+git checkout master
+echo "Done"
+exit $exitCode