Add processing .in files and configure only and skip configure options

mca.sh

@@ -4,15 +4,16 @@ set -e
 
 EXEC_NAME="$(basename -- "$0")"
 
-USAGE="Usage: $EXEC_NAME [OPTION]... [MCA_NAME|MCA_JAR|MCA_DIR] [INPUT]..."
+USAGE="Usage: $EXEC_NAME [OPTION]... [NAME|JAR|DIR] [INPUT]..."
 VERSION="mca 1.0.0"
 
-OPTION="$(getopt -n "$EXEC_NAME" -s sh -o hvfdxrs -l help -l version -- "$@")"
+OPTION="$(getopt -n "$EXEC_NAME" -s sh -o hvfdxrsc -l help -l version -- "$@")"
 eval set -- "$OPTION"
 
 SCREEN_OPTS=
 REATTACH_ONLY=0
 SKIP_CONFIGURE=0
+CONFIGURE_ONLY=0
 
 while :; do
     case "$1" in
@@ -39,6 +40,9 @@ while :; do
         -s)
             SKIP_CONFIGURE=1
             ;;
+        -c)
+            CONFIGURE_ONLY=1
+            ;;
         --)
             shift
             break
@@ -46,13 +50,19 @@ while :; do
     shift
 done
 
+if [ "$SKIP_CONFIGURE" -eq 1 ] && [ "$CONFIGURE_ONLY" -eq 1 ]; then
+    echo "$EXEC_NAME: can't skip configuration and only configure at \
+the same time" >&2
+    exit 2
+fi
+
 MCA_NAME=$1
 
 if [ -z "$MCA_NAME" ]; then
     MCA_DIR="$PWD"
     MCA_NAME="$(basename -- "$MCA_DIR")"
-elif echo "$MCA_NAME" | grep -qE '^\.{,2}/' && \
+elif echo "$MCA_NAME" | grep -qE '^\.{,2}/' \
-    MCA_NAME="$(readlink -f -- "$MCA_NAME")"; then
+    && MCA_NAME="$(readlink -f -- "$MCA_NAME")"; then
     if [ -d "$MCA_NAME" ]; then
         MCA_DIR="$MCA_NAME"
         MCA_NAME="$(basename -- "$MCA_DIR")"
@@ -64,155 +74,191 @@ else
     MCA_DIR="$HOME/mca/$MCA_NAME"
 fi
 
-if ! command -v screen > /dev/null; then
+if [ "$CONFIGURE_ONLY" -eq 0 ]; then
-    echo "$EXEC_NAME: screen not found" >&2
+    if ! command -v screen > /dev/null; then
-    exit 2
+        echo "$EXEC_NAME: screen not found" >&2
-fi
-
-if [ -n "$2" ]; then
-    shift
-    INPUT="$(echo "$*" | sed 's/"/\\\0/g')"
-    if screen -S "$MCA_NAME" -X eval "stuff \"$INPUT\"\\015" > /dev/null; then
-        exit 0
-    else
-        echo "$EXEC_NAME: $MCA_NAME: no such screen found" >&2
         exit 2
     fi
-fi
 
-MCA_SCREENRC_FILE="/etc/mca/screenrc"
+    SCREEN_NAME="$(echo "$MCA_NAME" | tr / -)"
-if [ ! -r "$MCA_SCREENRC_FILE" ]; then
-    echo "$EXEC_NAME: can't read $MCA_SCREENRC_FILE" >&2
-    exit 2
-fi
 
-if screen -c "$MCA_SCREENRC_FILE" "-$SCREEN_OPTS"rS \
+    if [ -n "$2" ]; then
-    "$MCA_NAME" > /dev/null 2>&1; then
+        shift
-    exit 0
+        INPUT="$(echo "$*" | sed 's/"/\\\0/g')"
-elif screen -S "$MCA_NAME" -X select . > /dev/null 2>&1; then
+        if screen -S "$SCREEN_NAME" \
-    echo "$EXEC_NAME: this screen has already been attached to someone" >&2
+            -X eval "stuff \"$INPUT\"\\015" > /dev/null; then
-    exit 2
+            exit 0
-fi
+        else
+            echo "$EXEC_NAME: $SCREEN_NAME: no such screen found" >&2
+            exit 2
+        fi
+    fi
 
-if [ "$REATTACH_ONLY" -eq 1 ]; then
+    SCREEN_RC_FILE=
-    echo "$EXEC_NAME: $MCA_NAME: no such screen found" >&2
+    for i in "$HOME/.config" /etc; do
-    exit 2
+        j="$i/mca/screenrc"
-fi
+        if [ -r "$j" ]; then
+            SCREEN_RC_FILE=$j
+            break
+        fi
+    done
 
-if [ ! -d "$MCA_DIR" ]; then
+    if [ -z "$SCREEN_RC_FILE" ]; then
-    echo "$EXEC_NAME: $MCA_DIR: such directory not found" >&2
+        echo "$EXEC_NAME: can't find screenrc" >&2
-    exit 2
+        exit 2
+    fi
+
+    if screen -c "$SCREEN_RC_FILE" "-$SCREEN_OPTS"rS \
+        "$SCREEN_NAME" > /dev/null 2>&1; then
+        exit 0
+    elif screen -S "$SCREEN_NAME" -X select . > /dev/null 2>&1; then
+        echo "$EXEC_NAME: this screen has already been attached to someone" >&2
+        exit 2
+    fi
+
+    if [ "$REATTACH_ONLY" -eq 1 ]; then
+        echo "$EXEC_NAME: $SCREEN_NAME: no such screen found" >&2
+        exit 2
+    fi
+
+    if [ ! -d "$MCA_DIR" ]; then
+        echo "$EXEC_NAME: $MCA_DIR: such directory not found" >&2
+        exit 2
+    fi
 fi
 
 cd "$MCA_DIR"
 
 MCA_RC_FILE="$MCA_DIR/.mcarc"
 
-# this file is taken from a dynamic variable, so we cannot specify an explicit
-# path to the file.
-# shellcheck disable=SC1090
-# `--` is supported in dash.
-# shellcheck disable=SC2240
 if [ -e "$MCA_RC_FILE" ]; then
-    set -a
+    # don't use `-p` in `read` for line breaks to avoid long lines.
-    . -- "$MCA_RC_FILE"
+    # shellcheck disable=SC2162
-    set +a
+    while IFS= read line; do
+        # skip lines starting with '#'
+        case "$line" in
+            ''|\#*)
+                continue
+                ;;
+        esac
 
+        # to get `$1` and `$2` as key and value.
+        # shellcheck disable=SC2086
+        set $line
+
+        if echo "$1" | grep -i '[^a-zA-Z0-9_]'; then
+            echo "$EXEC_NAME: $1: option key contains invalid characters" >&2
+        else
+            KEY="MCA_$(echo "$1" | tr '[:lower:]' '[:upper:]')"
+            if [ -n "$2" ]; then
+                shift
+                VALUE=$*
+            fi
+            export "$KEY"="$VALUE"
+        fi
+    done < "$MCA_RC_FILE"
     MCA_RC_FILE_READ=1
 else
     MCA_RC_FILE_READ=0
 fi
 
-if [ -z "$PLATFORM" ]; then
+if [ "$CONFIGURE_ONLY" -eq 0 ]; then
-    if [ -z "$MCA_JAR" ]; then
+    if [ -z "$MCA_PLATFORM" ]; then
-        MCA_JAR="$(find "$MCA_DIR" -maxdepth 1 \
+        if [ -z "$MCA_JAR" ]; then
-            -type f -name \*.jar | head -1)"
+            MCA_JAR="$(find "$MCA_DIR" -maxdepth 1 -type f -name \*.jar \
-        [ -z "$MCA_JAR" ] && {
+                | head -1)"
-            echo "$EXEC_NAME: no jar found in $MCA_DIR" >&2
+            [ -z "$MCA_JAR" ] && {
+                echo "$EXEC_NAME: no jar found in $MCA_DIR" >&2
+                exit 2
+            }
+        fi
+
+        if [ -e "$MCA_JAR" ]; then
+            MCA_PLATFORM="$(basename -- "$MCA_JAR")"
+            MCA_PLATFORM="$(echo "$MCA_PLATFORM" \
+                | tr '[:upper:]' '[:lower:]' | grep -oE '[a-z]+' | head -1)"
+        else
+            echo "$EXEC_NAME: $MCA_JAR: no such file" >&2
             exit 2
-        }
+        fi
-    fi
-
-    if [ -e "$MCA_JAR" ]; then
-        PLATFORM="$(basename -- "$MCA_JAR")"
-        PLATFORM="$(echo "$PLATFORM" | tr '[:upper:]' '[:lower:]' | \
-            grep -oE '[a-z]+' | head -1)"
     else
-        echo "$EXEC_NAME: $MCA_JAR: no such file" >&2
+        [ -z "$MCA_JAR" ] && MCA_JAR="$MCA_DIR/$MCA_PLATFORM.jar"
+        if [ ! -e "$MCA_JAR" ]; then
+            echo "$EXEC_NAME: $MCA_JAR: no such file" >&2
+            exit 2
+        fi
+    fi
+
+    [ -n "$MCA_JVM_FLAGS" ] && MCA_JVM_FLAGS="$MCA_JVM_FLAGS "
+    MCA_JVM_FLAGS="$MCA_JVM_FLAGS-Dfile.encoding=UTF-8 \
+-Djava.awt.headless=true"
+
+    case "$MCA_PLATFORM" in
+        bungee)
+            ;;
+        waterfall|velocity)
+            [ "$MCA_PLATFORM" = "bungee" ] || MCA_JVM_FLAGS="$MCA_JVM_FLAGS \
+    -XX:+UseG1GC \
+    -XX:G1HeapRegionSize=4M \
+    -XX:+UnlockExperimentalVMOptions \
+    -XX:+ParallelRefProcEnabled \
+    -XX:+AlwaysPreTouch \
+    -DIReallyKnowWhatIAmDoingISwear=true"
+            ;;
+        minecraft|bukkit|craftbukkit|spigot|paper)
+            MCA_JVM_FLAGS="$MCA_JVM_FLAGS -Dcom.mojang.eula.agree=true \
+    -DIReallyKnowWhatIAmDoingISwear=true"
+            [ "$MCA_PLATFORM" = "paper" ] && MCA_JVM_FLAGS="$MCA_JVM_FLAGS \
+    -XX:+UseG1GC \
+    -XX:+ParallelRefProcEnabled \
+    -XX:MaxGCPauseMillis=200 \
+    -XX:+UnlockExperimentalVMOptions \
+    -XX:+DisableExplicitGC \
+    -XX:+AlwaysPreTouch \
+    -XX:G1NewSizePercent=30 \
+    -XX:G1MaxNewSizePercent=40 \
+    -XX:G1HeapRegionSize=8M \
+    -XX:G1ReservePercent=20 \
+    -XX:G1HeapWastePercent=5 \
+    -XX:G1MixedGCCountTarget=4 \
+    -XX:InitiatingHeapOccupancyPercent=15 \
+    -XX:G1MixedGCLiveThresholdPercent=90 \
+    -XX:G1RSetUpdatingPauseTimePercent=5 \
+    -XX:SurvivorRatio=32 \
+    -XX:+PerfDisableSharedMem \
+    -XX:MaxTenuringThreshold=1 \
+    -Dusing.aikars.flags=https://mcflags.emc.gs \
+    -Daikars.new.flags=true"
+            ;;
+        custom)
+            ;;
+        *)
+            echo "$EXEC_NAME: invalid platform: $MCA_PLATFORM. Valid: bungee, \
+                waterfall, velocity, minecraft, bukkit, craftbukkit, spigot, \
+                paper, custom" >&2
+            exit 2
+            ;;
+    esac
+
+    if [ -n "$MCA_OPT_JAVA_HOME" ] && [ -d "$MCA_OPT_JAVA_HOME/bin" ]; then
+        PATH="$MCA_OPT_JAVA_HOME/bin:$PATH"
+    fi
+
+    if ! command -v java > /dev/null; then
+        echo "$EXEC_NAME: unable to get Java version (is Java installed?)" >&2
         exit 2
     fi
-else
+
-    [ -z "$MCA_JAR" ] && MCA_JAR="$MCA_DIR/$PLATFORM.jar"
+    [ -n "$MCA_OPT_MAX_MEMORY" ] \
-    [ ! -e "$MCA_JAR" ] && {
+        && MCA_JVM_FLAGS="-Xmx$MCA_OPT_MAX_MEMORY $MCA_JVM_FLAGS"
-        echo "$EXEC_NAME: $MCA_JAR: no such file" >&2
+    [ -n "$MCA_OPT_MIN_MEMORY" ] \
-        exit 2
+        && MCA_JVM_FLAGS="-Xms$MCA_OPT_MIN_MEMORY $MCA_JVM_FLAGS"
-    }
+
+    SCREEN_CMD="$(which java) -server $MCA_JVM_FLAGS -jar $MCA_JAR"
 fi
 
-[ -n "$JVM_FLAGS" ] && JVM_FLAGS="$JVM_FLAGS "
-JVM_FLAGS="$JVM_FLAGS-Dfile.encoding=UTF-8 -Djava.awt.headless=true"
-
-case "$PLATFORM" in
-    bungee)
-        ;;
-    waterfall|velocity)
-        [ "$PLATFORM" = "bungee" ] || JVM_FLAGS="$JVM_FLAGS -XX:+UseG1GC \
--XX:G1HeapRegionSize=4M \
--XX:+UnlockExperimentalVMOptions \
--XX:+ParallelRefProcEnabled \
--XX:+AlwaysPreTouch \
--DIReallyKnowWhatIAmDoingISwear=true"
-        ;;
-    minecraft|bukkit|craftbukkit|spigot|paper)
-        JVM_FLAGS="$JVM_FLAGS -Dcom.mojang.eula.agree=true \
--DIReallyKnowWhatIAmDoingISwear=true"
-        [ "$PLATFORM" = "paper" ] && JVM_FLAGS="$JVM_FLAGS -XX:+UseG1GC \
--XX:+ParallelRefProcEnabled \
--XX:MaxGCPauseMillis=200 \
--XX:+UnlockExperimentalVMOptions \
--XX:+DisableExplicitGC \
--XX:+AlwaysPreTouch \
--XX:G1NewSizePercent=30 \
--XX:G1MaxNewSizePercent=40 \
--XX:G1HeapRegionSize=8M \
--XX:G1ReservePercent=20 \
--XX:G1HeapWastePercent=5 \
--XX:G1MixedGCCountTarget=4 \
--XX:InitiatingHeapOccupancyPercent=15 \
--XX:G1MixedGCLiveThresholdPercent=90 \
--XX:G1RSetUpdatingPauseTimePercent=5 \
--XX:SurvivorRatio=32 \
--XX:+PerfDisableSharedMem \
--XX:MaxTenuringThreshold=1 \
--Dusing.aikars.flags=https://mcflags.emc.gs \
--Daikars.new.flags=true"
-        ;;
-    custom)
-        ;;
-    *)
-        echo "$EXEC_NAME: invalid platform: $PLATFORM. Valid: bungee, \
-            waterfall, velocity, minecraft, bukkit, craftbukkit, spigot, \
-            paper, custom" >&2
-        exit 2
-        ;;
-esac
-
-if [ -n "$JAVA_HOME" ] && [ -d "$JAVA_HOME/bin" ]; then
-    PATH="$JAVA_HOME/bin:$PATH"
-fi
-
-if ! command -v java > /dev/null; then
-    echo "$EXEC_NAME: unable to get Java version (is Java installed?)" >&2
-    exit 2
-fi
-
-[ -n "$MAX_MEMORY" ] && JVM_FLAGS="-Xmx$MAX_MEMORY $JVM_FLAGS"
-[ -n "$MIN_MEMORY" ] && JVM_FLAGS="-Xms$MIN_MEMORY $JVM_FLAGS"
-
-MCA_CMD="$(which java) -server $JVM_FLAGS -jar $MCA_JAR"
-
 if [ "$SKIP_CONFIGURE" -eq 0 ] && [ "$MCA_RC_FILE_READ" -eq 1 ]; then
-    ENV_LIST="$(cut -d= -f1 < "$MCA_RC_FILE" | sed 's/^/$/g'))"
+    ENV_LIST="$(env | grep ^MCA_ | cut -d= -f1 | sed 's/^/$/g')"
     FILE_LIST="$(find . -name '*.in' -type f)"
 
     [ -z "$FILE_LIST" ] || echo "$FILE_LIST" | while read -r line; do
@@ -220,11 +266,14 @@ if [ "$SKIP_CONFIGURE" -eq 0 ] && [ "$MCA_RC_FILE_READ" -eq 1 ]; then
     done
 fi
 
-# papermc prints uncolored text if the COLORTERM variable is set to
+if [ "$CONFIGURE_ONLY" -eq 0 ]; then
-# `truecolor`.
+    # papermc prints uncolored text if the COLORTERM variable is set to
-export COLORTERM=
+    # `truecolor`.
+    export COLORTERM=
 
-# we don't quote $MCA_CMD because screen treats arguments after the second one
+    # we don't quote $SCREEN_CMD because screen treats arguments after the
-# as a command.
+    # second one as a command.
-# shellcheck disable=SC2086
+    # shellcheck disable=SC2086
-exec screen -c "$MCA_SCREENRC_FILE" "-$SCREEN_OPTS"S "$MCA_NAME" -- $MCA_CMD
+    exec screen -c "$SCREEN_RC_FILE" "-$SCREEN_OPTS"S "$SCREEN_NAME" \
+        -- $SCREEN_CMD
+fi