refactor: use $(fn) instead of backtick calls

please

@@ -12,8 +12,8 @@ set -e
 
 declare -A EVENTS
 
-FULL=`readlink -f $0` # fullpath
-PLIZ=`basename $0`    # name
+FULL=$(readlink -f $0) # fullpath
+PLIZ=$(basename $0)    # name
 
 line() { echo -e "\e[${3:-0};$2m$1\e[0m"; if [[ "$4" != "" ]]; then exit $4; fi }
 error() { line "$1" 31 0 $2; }
@@ -26,10 +26,10 @@ qgit() { git "$@" &>> $TMP_LOG; }
 # github api
 github()
 {
-  RESP=`bash -c "curl --silent -H 'Authorization: token $GH_AUTH_TOKEN' $@"`
+  RESP=$(bash -c "curl --silent -H 'Authorization: token $GH_AUTH_TOKEN' $@")
   echo "$RESP" >> ${TMP_LOG}
 
-  ERROR=`echo $RESP | jq -r '.message?'`
+  ERROR=$(echo $RESP | jq -r '.message?')
   [[ $ERROR ]] && [[ "null" != "$ERROR" ]] && error "Github: $ERROR" 1
 
   echo "$RESP"
@@ -39,7 +39,7 @@ github()
 usage()
 {
   cat << USAGE
-$PLIZ $(info `version`) | $(ok "(c) Jitendra Adhikari") | $PLIZ is semver release made easy.
+$PLIZ $(info $(version)) | $(ok "(c) Jitendra Adhikari") | $PLIZ is semver release made easy.
 
 $(ok Usage:) $PLIZ [command|scope] [--options]
 
@@ -104,9 +104,9 @@ organize-commits() # $1 = diff_range, $2 = commit_types_csv
       if [[ "$scope" != "" ]]; then scope="**${scope^}**: "; fi
       CHANGELOG[$type]="${CHANGELOG[$type]}- ${scope}${subject^}\n"
     fi
-  done <<< `git log $1 --no-merges --oneline --pretty="$GCFMT" --grep "\[skip" --grep "skip\]" --grep "StyleCI" --invert-grep`
+  done <<< $(git log $1 --no-merges --oneline --pretty="$GCFMT" --grep "\[skip" --grep "skip\]" --grep "StyleCI" --invert-grep)
 
-  ORGANIZED="" TYPES=(`echo ${2:-feat,fix,refactor,revert,perf,chore,infra,docs,build} | tr ',' '\n'`)
+  ORGANIZED="" TYPES=($(echo ${2:-feat,fix,refactor,revert,perf,chore,infra,docs,build} | tr ',' '\n'))
   for TYPE in ${TYPES[@]}; do
     if [[ "${CHANGELOG[$TYPE]}" != "" ]]; then
       ORGANIZED="$ORGANIZED### ${LABELS[$TYPE]}\n${CHANGELOG[$TYPE]}\n"
@@ -118,7 +118,7 @@ organize-commits() # $1 = diff_range, $2 = commit_types_csv
 # update please
 update()
 {
-  NEWVER=`curl -sSL https://raw.githubusercontent.com/adhocore/please/master/VERSION`
+  NEWVER=$(curl -sSL https://raw.githubusercontent.com/adhocore/please/master/VERSION)
   [[ "v$NEWVER" == "$(version)" ]] && ok "Already latest version" 0
 
   info "Updating $PLIZ ..."
@@ -131,7 +131,7 @@ version() { echo v0.10.3; }
 # get box.phar path
 get-box()
 {
-  case `php -r "echo substr(phpversion(), 0, 3);"` in
+  case $(php -r "echo substr(phpversion(), 0, 3);") in
     7.2 | 7.3 | 7.4) BOX_VER=3.8.0 ;;
     7.1) BOX_VER=3.7.0 ;;
     7.0 | 5.6 | 5.5 | 5.4 | 5.3) BOX_VER=2.7.5 ;;
@@ -146,38 +146,38 @@ get-box()
     fi
   fi
 
-  echo `realpath ~/box.$BOX_VER.phar`
+  echo $(realpath ~/box.$BOX_VER.phar)
 }
 
 # publish phar
 publish-phar()
 {
-  PBIN=`cat composer.json | jq -r '.bin[0]?'`
+  PBIN=$(cat composer.json | jq -r '.bin[0]?')
   if [ "null" == "$PBIN" ]; then
     info "Check ${TMP_LOG} for logs" && error "Check bin value in composer.json" 1
   fi
 
   trigger before-phar
   info "Compiling phar ..."
-  php `get-box` compile >> ${TMP_LOG}
+  php $(get-box) compile >> ${TMP_LOG}
   ok
 
-  PHAR_FILE=`realpath $PBIN.phar`  NAME=`basename $PHAR_FILE`
+  PHAR_FILE=$(realpath $PBIN.phar)  NAME=$(basename $PHAR_FILE)
   info "Publishing phar ..."
 
-  SIZE=`github \
+  SIZE=$(github \
     "-H 'Content-Type: application/octet-stream' \
     --data-binary @$PHAR_FILE \
     https://uploads.$GH_REPO/releases/$LAST_RELEASE_ID/assets?name=$NAME" \
-      | jq -r '.size'`
+      | jq -r '.size')
   ok
   info "[OK] $NAME $SIZE bytes"
 }
 
 # publish npm
 publish-npm()
 {
-  PKG=`cat ./package.json`  PVT=`echo $PKG | jq -r '.private?'`
+  PKG=$(cat ./package.json)  PVT=$(echo $PKG | jq -r '.private?')
   echo $PKG | jq ".version = \"$NEXT_VERSION\"" > ./package.json
   qgit add ./package.json && GPUSH=1
 
@@ -207,7 +207,7 @@ trigger() # $1 = event
 }
 
 GCFMT="%s (%an)"    # git commit log format
-REPO=`git config --get remote.origin.url | sed -e 's/git@github.com://;s/https:\/\/github.com\///;s/.git//'`
+REPO=$(git config --get remote.origin.url | sed -e 's/git@github.com://;s/https:\/\/github.com\///;s/.git//')
 
 # load events
 [[ -f ./please.json ]] && eval $(cat ./please.json | jq -r 'to_entries|map("EVENTS[\(.key)]=\"\(.value)\"")|.[]')
@@ -242,7 +242,7 @@ VFILE=${VFILE:-0}   # create version file
 CHLOG=${CHLOG:-0}   # create changelog file
 YES=${YES:-0}       # assume yes
 
-GH_REPO="github.com/repos/$REPO"  TMP_LOG=`mktemp -t PLZ.XXXXXXXXXX`
+GH_REPO="github.com/repos/$REPO"  TMP_LOG=$(mktemp -t PLZ.XXXXXXXXXX)
 ok "Repository $REPO" && info "Log file $TMP_LOG"
 
 DEPLOY_BRANCH="${DEPLOY_BRANCH:-master}"
@@ -258,14 +258,14 @@ else
 fi
 
 info "Getting latest releases ..."
-VERSION=`github "https://api.$GH_REPO/releases?per_page=1" | jq -r '.[0]?.tag_name?'`
+VERSION=$(github "https://api.$GH_REPO/releases?per_page=1" | jq -r '.[0]?.tag_name?')
 RANGE="$VERSION..HEAD"
 
 [[ "null" == "$VERSION" ]] && { VERSION="0.0.0"  RANGE=""; }
 ok "  Done [$VERSION]"
 
 info "Collecting commits ..."
-COMMITS=`organize-commits "$RANGE" "$TYPES"`
+COMMITS=$(organize-commits "$RANGE" "$TYPES")
 ok
 
 [[ $COMMITS ]] || error "Nothing to release" 0
@@ -275,19 +275,19 @@ echo $COMMITS >> $TMP_LOG
 # determine next version
 info "Bumping version ..."
 if [[ "" = "$NEXT_VERSION" ]]; then
-  FEAT=`git log $RANGE --oneline --pretty="%s" | grep -P '^feat' || echo ""`
+  FEAT=$(git log $RANGE --oneline --pretty="%s" | grep -P '^feat' || echo "")
   if [[ $MAJOR -eq 1 ]]; then
     V=""
     if [[ $VERSION == v* ]]; then
       V="v"  VERSION="${VERSION//v/}"
     fi
-    NEXT_VERSION=`echo $VERSION | (IFS=".$IFS"; read a b c && echo $V$((a + 1)).0.0)`
+    NEXT_VERSION=$(echo $VERSION | (IFS=".$IFS"; read a b c && echo $V$((a + 1)).0.0))
   elif [[ $MINOR -eq 1 ]]; then
-    NEXT_VERSION=`echo $VERSION | (IFS=".$IFS"; read a b c && echo $a.$((b + 1)).0)`
+    NEXT_VERSION=$(echo $VERSION | (IFS=".$IFS"; read a b c && echo $a.$((b + 1)).0))
   elif [[ "" != "$FEAT" ]]; then
-    NEXT_VERSION=`echo $VERSION | (IFS=".$IFS"; read a b c && echo $a.$((b + 1)).0)`
+    NEXT_VERSION=$(echo $VERSION | (IFS=".$IFS"; read a b c && echo $a.$((b + 1)).0))
   else
-    NEXT_VERSION=`echo $VERSION | (IFS=".$IFS"; read a b c && echo $a.$b.$((c + 1)))`
+    NEXT_VERSION=$(echo $VERSION | (IFS=".$IFS"; read a b c && echo $a.$b.$((c + 1))))
   fi
 fi
 ok "  Done [$NEXT_VERSION]"
@@ -333,12 +333,12 @@ fi
 # github release
 trigger before-vcs
 info "Releasing $NEXT_VERSION ..."
-COMMITS=`printf %s "$COMMITS"`
-LAST_RELEASE_ID=`curl --silent -H "Authorization: token $GH_AUTH_TOKEN" \
+COMMITS=$(printf %s "$COMMITS")
+LAST_RELEASE_ID=$(curl --silent -H "Authorization: token $GH_AUTH_TOKEN" \
   -H 'Content-Type: application/json' \
   -d "{\"tag_name\":\"$NEXT_VERSION\",\"name\":\"Version $NEXT_VERSION\",\"body\":\"$COMMITS\"}" \
   https://api.$GH_REPO/releases \
-    | jq -r '.id?'`
+    | jq -r '.id?')
 
 if [ "null" == "${LAST_RELEASE_ID:-null}" ]; then
   error "Something went wrong" && info "Check $TMP_LOG for logs" 1