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1#!/bin/sh
2
3LANG=C
4
5if [ "$1" == "-h" ]
6then
7    cat <<- EOH
8		    Usage: $0 [-p] [folder]
9		      -p option prints out unused resources, otherwise a total count is printed
10		      folder option causes only that app folder to be scanned, default is to scan all folders onder apps/
11		EOH
12    exit
13fi
14
15showall=no
16if [ "$1" == "-p" ]
17then
18    showall=yes
19    shift
20fi
21
22apps=$1
23if [ "$apps" == "" ]
24then
25    apps=$ANDROID_BUILD_TOP/packages/apps/*
26fi
27
28for app in $apps
29do
30    echo '-----------------------------------------------------------'
31    if [ "$app" == "." ]
32    then
33        app=$(pwd)
34    fi
35    if [ -d $app/res ]
36    then
37        appname=$(basename $app)
38        iappname=$(grep LOCAL_PACKAGE_NAME $app/Android.mk | sed 's/.*:= *//')
39        resources=
40        for res in $(echo $app/res/* $(find $ANDROID_BUILD_TOP/vendor -type d -wholename $ANDROID_BUILD_TOP/vendor/*/$appname/res | grep overlay))
41        do
42            resources="$resources $(echo $res | grep -v '\-mcc\|[a-z]*-[a-z][a-z]$\|[a-z]*-[a-z][a-z]-.*')"
43        done
44        sources=$app/src
45        if [ -d $app/tests ]
46        then
47            sources="$sources $app/tests"
48        fi
49        if [ -d $app/samples ]
50        then
51            sources="$sources $app/samples"
52        fi
53
54        # find the R.java file that contains all the generated resource identifiers
55        rDotJava=$(find $ANDROID_BUILD_TOP/out/target/common/obj/APPS/${iappname}_intermediates/ -name R.java)
56
57        # Simplistically process the content of the file to get the names of all the constants,
58        # and try to find a reference to each constant.
59
60        # First take all the input files and concatenate them, removing newlines. This allows us to
61        # find expressions that are broken up over multiple lines, i.e. R.drawable.\nsomeconstant
62        find $resources $sources $app/AndroidManifest.xml -type f -print |xargs cat | tr -d '\n ' > /tmp/everything$$
63
64        # Now look for each of the constants in the contatenated file.
65        for i in $(cat $rDotJava | grep "\w*=0x\d*" | sed 's/ *public static final int //' | sed 's/=0x.*//')
66        do
67            # Since periods in the names get translated to underscores in R.java, and you can actually
68            # refer to such constants from java by using an underscore instead of a period, we also
69            # replace all underscores with a pattern that will match periods and underscores.
70            p=$(echo $i | sed 's/_/[\\._]/g')
71            echo $i $(grep -cw R\\..*\\.$i\\\|@style/$p\\\|@drawable/$p\\\|@anim/$p\\\|@color/$p\\\|@xml/$p\\\|@layout/$p\\\|@menu/$p\\\|@+id/$p\\\|@array/$p\\\|@string/$p\\\|@mipmap/$p\\\|@integer/$p\\\|@dimen/$p\\\|\[a-z\]\*:$p\\\|enumname=\"$p\\\|\<item\>$p\< < /tmp/everything$$)
72        done | grep " 0$" | {
73            # this block gets as its input a list of constants for which no references were found, one per line
74            if [ "$showall" == "yes" ]
75            then
76                echo $app
77                cat
78            else
79                count=$(wc -l)
80                if [ "$count" != "0" ]
81                then
82                    echo $app: $count unused resources
83                fi
84            fi
85        }
86        rm /tmp/everything$$
87    fi
88done
89