chore: apply fixes from shellcheck

deploy.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-cd $(dirname $0)
+cd "$(dirname "$0")"
 cp /code/cqfn-secrets/jpeek-settings-heroku.xml settings.xml
 git add settings.xml
 git commit -m 'settings.xml for dokku'

ping-all.sh

@@ -2,6 +2,6 @@
 set -e
 
 while IFS= read -r a; do
-	curl -s https://i.jpeek.org/${a}/index.html > /dev/null
+	curl -s "https://i.jpeek.org/${a}/index.html" > /dev/null
 	echo "${a} pinged"
-done < artifacts.csv
+done < artifacts.csv

research/2018-April/04-collect-metrics/process-artifact.sh

@@ -32,12 +32,12 @@ jar=$1
 output=$3
 path=${2//.//}
 meta=$(curl --fail --silent "https://repo1.maven.org/maven2/${path}/maven-metadata.xml")
-version=$(echo ${meta} | xmllint --xpath '/metadata/versioning/latest/text()' -)
-group=$(echo ${meta} | xmllint --xpath '/metadata/groupId/text()' -)
-artifact=$(echo ${meta} | xmllint --xpath '/metadata/artifactId/text()' -)
+version=$(echo "${meta}" | xmllint --xpath '/metadata/versioning/latest/text()' -)
+artifact=$(echo "${meta}" | xmllint --xpath '/metadata/artifactId/text()' -)
 
 home=$(pwd)
 dir=$(mktemp -d /tmp/jpeek-XXXX)
+# shellcheck disable=SC2064
 trap "rm -rf ${dir}" EXIT
 curl --fail --silent "https://repo1.maven.org/maven2/${path}/${version}/${artifact}-${version}.jar" > "${dir}/${artifact}.jar"
 cd "${dir}"
@@ -46,4 +46,4 @@ unzip -o -q -d "${artifact}" "${artifact}.jar"
 java -jar "${jar}" --sources "${artifact}" --target ./target --quiet
 ruby "${home}/collect.rb" target >> "${output}"
 cd
-rm -rf ${dir}
+rm -rf "${dir}"

research/2018-April/04-collect-metrics/run.sh

@@ -28,12 +28,12 @@ home=$(pwd)
 jar=~/.m2/repository/org/jpeek/jpeek/1.0-SNAPSHOT/jpeek-1.0-SNAPSHOT-jar-with-dependencies.jar
 if [ ! -e "${jar}" ]; then
   echo "${jar} doesn't exist, please run 'mvn clean install' first"
-  exit -1
+  exit 1
 fi
 
 rm -f "${home}/metrics.txt"
 
-while read line
+while read -r line
 do
   IFS=',' read -ra parts <<< "${line}"
   echo "${parts[0]}..."