TOOLS/mpv_identify.sh: move script body to a function

Don't prepend each variable with __midentify__, just make them local
to the function.

TOOLS/mpv_identify.sh

@@ -17,6 +17,8 @@
 # When multiple files were specified, their info will be put into FOO_* for the
 # first file, FOO_1_* for the second file, FOO_2_* for the third file, etc.
 
+__midentify__main() {
+
     case "$0" in
         mpv_identify.sh|*/mpv_identify.sh)
             # we are NOT being sourced
@@ -42,25 +44,25 @@ if [ $# -lt 2 ]; then
         echo >&2 "not always identify the specified file, but the"
         echo >&2 "file providing the first chapter. Specify"
         echo >&2 "--no-ordered-chapters to prevent this."
-    exit 1
+        return 1
     fi
 
     if [ -z "$MPV" ]; then
-    MPV="mpv"
+        local MPV="mpv"
     fi
 
-__midentify__LF="
+    local LF="
 "
 
-__midentify__nextprefix=$1
+    local nextprefix=$1
     shift
 
-if [ -n "$__midentify__nextprefix" ]; then
+    if [ -n "$nextprefix" ]; then
         # in case of error, we always want this unset
-    eval unset $__midentify__nextprefix'path'
+        eval unset $nextprefix'path'
     fi
 
-__midentify__allprops="
+    local allprops="
         filename
         path
         stream-start
@@ -97,77 +99,71 @@ __midentify__allprops="
     "
     # TODO add metadata support once mpv can do it
 
-__midentify__propstr="X-MIDENTIFY-START:$__midentify__LF"
+    local propstr="X-MIDENTIFY-START:$LF"
-for __midentify__key in $__midentify__allprops; do
+    local key
-    __midentify__propstr=$__midentify__propstr"X-MIDENTIFY: $__midentify__key \${=$__midentify__key}$__midentify__LF"
+    for key in $allprops; do
-    __midentify__key=`echo "$__midentify__key" | tr - _`
+        propstr=$propstr"X-MIDENTIFY: $key \${=$key}$LF"
-    eval unset $__midentify__nextprefix$__midentify__key
+        key=`echo "$key" | tr - _`
+        eval unset $nextprefix$key
     done
 
-__midentify__output=`$MPV --term-playing-msg="$__midentify__propstr" --vo=null --ao=null --frames=1 --quiet --no-cache --no-config "$@"`
+    local output=`$MPV --term-playing-msg="$propstr" --vo=null --ao=null --frames=1 --quiet --no-cache --no-config "$@"`
-__midentify__fileindex=0
+    local fileindex=0
-__midentify__prefix=
+    local prefix=
     while :; do
-    case "$__midentify__output" in
+        local line output
+        case "$output" in
             '')
                 break
                 ;;
-        *$__midentify__LF*)
+            *$LF*)
-            __midentify__line=${__midentify__output%%$__midentify__LF*}
+                line=${output%%$LF*}
-            __midentify__output=${__midentify__output#*$__midentify__LF}
+                output=${output#*$LF}
                 ;;
             *)
-            __midentify__line=$__midentify__output
+                line=$output
-            __midentify__output=
+                output=
                 ;;
         esac
-    case "$__midentify__line" in
+        case "$line" in
             X-MIDENTIFY-START:)
-            if [ -n "$__midentify__nextprefix" ]; then
+                if [ -n "$nextprefix" ]; then
-                __midentify__prefix=$__midentify__nextprefix
+                    prefix=$nextprefix
-                if [ $__midentify__fileindex -gt 0 ]; then
+                    if [ $fileindex -gt 0 ]; then
-                    __midentify__nextprefix=${__midentify__prefix%$__midentify__fileindex\_}
+                        nextprefix=${prefix%$fileindex\_}
                     fi
-                __midentify__fileindex=$(($__midentify__fileindex+1))
+                    fileindex=$(($fileindex+1))
-                __midentify__nextprefix=$__midentify__nextprefix$__midentify__fileindex\_
+                    nextprefix=$nextprefix$fileindex\_
-                for __midentify__key in $__midentify__allprops; do
+                    for key in $allprops; do
-                    __midentify__key=`echo "$__midentify__key" | tr - _`
+                        key=`echo "$key" | tr - _`
-                    eval unset $__midentify__nextprefix$__midentify__key
+                        eval unset $nextprefix$key
                     done
                 else
-                if [ $__midentify__fileindex -gt 0 ]; then
+                    if [ $fileindex -gt 0 ]; then
                         echo
                     fi
-                __midentify__fileindex=$(($__midentify__fileindex+1))
+                    fileindex=$(($fileindex+1))
                 fi
                 ;;
             X-MIDENTIFY:\ *)
-            __midentify__key=${__midentify__line#X-MIDENTIFY:\ }
+                key=${line#X-MIDENTIFY:\ }
-            __midentify__value=${__midentify__key#* }
+                local value=${key#* }
-            __midentify__key=${__midentify__key%% *}
+                key=${key%% *}
-            __midentify__key=`echo "$__midentify__key" | tr - _`
+                key=`echo "$key" | tr - _`
-            if [ -n "$__midentify__nextprefix" ]; then
+                if [ -n "$nextprefix" ]; then
-                if [ -z "$__midentify__prefix" ]; then
+                    if [ -z "$prefix" ]; then
                         echo >&2 "Got X-MIDENTIFY: without X-MIDENTIFY-START:"
-                elif [ -n "$__midentify__value" ]; then
+                    elif [ -n "$value" ]; then
-                    eval $__midentify__prefix$__midentify__key=\$__midentify__value
+                        eval $prefix$key=\$value
                     fi
                 else
-                if [ -n "$__midentify__value" ]; then
+                    if [ -n "$value" ]; then
-                    echo "$__midentify__key=$__midentify__value"
+                        echo "$key=$value"
                     fi
                 fi
                 ;;
         esac
     done
+}
 
-unset __midentify__fileindex
+__midentify__main "$@"
-unset __midentify__allprops
-unset __midentify__key
-unset __midentify__LF
-unset __midentify__line
-unset __midentify__output
-unset __midentify__nextprefix
-unset __midentify__prefix
-unset __midentify__propstr
-unset __midentify__value