Simply copyright and author header components when empty

* make clear that array expansion was not desired in one case
* change `$@` to `$*` in one case
* remove unnecessary `$` in arithmetic context
* fix quoting in complex traceback message

.github/workflows/main.yaml

@@ -23,6 +23,11 @@ jobs:
         cd ../../
         PREFIX="$PREFIX" make test-ci
         cat junit.xml
+    - name: Run ShellCheck
+      uses: ludeeus/action-shellcheck@master
+      with:
+        ignore_paths: deps tests installed
+        scandir: .
     - name: Publish Test Report
       uses: mikepenz/action-junit-report@v5
       if: success() || failure() # always run even if the previous step fails

.shellcheckrc

@@ -0,0 +1,8 @@
+# Many array expressions are constructed and eval-ed
+disable=SC2016
+# False positive on "CMDARG_ERROR_BEHAVIOR=return"
+disable=SC2209
+# Checking exit code with $? is more of a preference when the script doesn't try to support the errexit shell option
+disable=SC2181
+# Masking exit codes isn't much of a problem in this script
+disable=SC2155

cmdarg.sh

@@ -36,7 +36,7 @@ function cmdarg
         echo "-h is reserved for cmdarg usage" >&2
         ${CMDARG_ERROR_BEHAVIOR} 1
     fi
-    if  [[ "$(type -t cmdarg_$key)" != "" ]] || \
+    if  [[ "$(type -t cmdarg_"$key")" != "" ]] || \
         [[ "${CMDARG_FLAGS[$shortopt]}" != "" ]] || \
         [[ "${CMDARG_TYPES[$key]}" != "" ]]; then
         echo "command line key '$shortopt ($key)' is reserved by cmdarg or defined twice" >&2
@@ -53,14 +53,14 @@ function cmdarg
     elif [[ "$argtype" != "" ]]; then
         CMDARG_FLAGS[$shortopt]=${argtypemap["$argtype"]}
         if [[ "${1:2:4}" == "[]" ]]; then
-	    declare -p ${key} >/dev/null 2>&1
+            declare -p "${key}" >/dev/null 2>&1
             if [[ $? -ne 0 ]]; then
                 echo 'Array variable '"${key}"' does not exist. Array variables MUST be declared by the user!' >&2
                 ${CMDARG_ERROR_BEHAVIOR} 1
             fi
             CMDARG_TYPES[$key]=$CMDARG_TYPE_ARRAY
         elif [[ "${1:2:4}" == "{}" ]]; then
-	    declare -p ${key} >/dev/null 2>&1
+            declare -p "${key}" >/dev/null 2>&1
             if [[ $? -ne 0 ]]; then
                 echo 'Hash variable '"${key}"' does not exist. Hash variables MUST be declared by the user!' >&2
                 ${CMDARG_ERROR_BEHAVIOR} 1
@@ -80,14 +80,14 @@ function cmdarg
     CMDARG_DESC["$shortopt"]=$3
     CMDARG_DEFAULT["$shortopt"]=${4:-}
     if [[ ${CMDARG_FLAGS[$shortopt]} -eq $CMDARG_FLAG_REQARG ]] && [[ "${4:-}" == "" ]]; then
-	CMDARG_REQUIRED+=($shortopt)
+        CMDARG_REQUIRED+=("$shortopt")
     else
-	CMDARG_OPTIONAL+=($shortopt)
+        CMDARG_OPTIONAL+=("$shortopt")
     fi
     cmdarg_cfg["$2"]="${4:-}"
     local validatorfunc
     validatorfunc=${5:-}
-    if [[ "$validatorfunc" != "" ]] && [[ "$(declare -F $validatorfunc)" == "" ]]; then
+    if [[ "$validatorfunc" != "" ]] && [[ "$(declare -F "$validatorfunc")" == "" ]]; then
         echo "Validators must be bash functions accepting 1 argument (not '$validatorfunc')" >&2
         ${CMDARG_ERROR_BEHAVIOR} 1
     fi
@@ -120,7 +120,7 @@ function cmdarg_describe
     local flags="${CMDARG_FLAGS[$opt]}"
     local validator="${CMDARG_VALIDATORS[$opt]}"
 
-    ${cmdarg_helpers['describe']} $longopt $opt $argtype "${default}" "${description}" "${flags}" "${validator}"
+    ${cmdarg_helpers['describe']} "$longopt" "$opt" "$argtype" "${default}" "${description}" "${flags}" "${validator}"
 }
 
 function cmdarg_describe_default
@@ -139,16 +139,16 @@ function cmdarg_describe_default
         default="(Default \"${default}\")"
     fi
     case ${argtype} in
-	$CMDARG_TYPE_STRING)
+        "$CMDARG_TYPE_STRING")
             echo "-${opt},--${longopt} v : String. ${description} ${default}"
             ;;
-	$CMDARG_TYPE_BOOLEAN)
+        "$CMDARG_TYPE_BOOLEAN")
             echo "-${opt},--${longopt} : Boolean. ${description} ${default}"
             ;;
-	$CMDARG_TYPE_ARRAY)
+        "$CMDARG_TYPE_ARRAY")
             echo "-${opt},--${longopt} v[, ...] : Array. ${description}. Pass this argument multiple times for multiple values. ${default}"
             ;;
-	$CMDARG_TYPE_HASH)
+        "$CMDARG_TYPE_HASH")
             echo "-${opt},--${longopt} k=v{, ..} : Hash. ${description}. Pass this argument multiple times for multiple key/value pairs. ${default}"
             ;;
         *)
@@ -164,7 +164,10 @@ function cmdarg_usage
     # cmdarg_usage
     #
     # Prints a very helpful usage message about the current program.
-    echo "$(basename $0) ${CMDARG_INFO['copyright']} : ${CMDARG_INFO['author']}"
+    local copyright=${CMDARG_INFO['copyright']:+ ${CMDARG_INFO['copyright']}}
+    local author=${CMDARG_INFO['author']:+ : ${CMDARG_INFO['author']}}
+
+    echo "$(basename "$0")$copyright$author"
     echo
     echo "${CMDARG_INFO['header']}"
     echo
@@ -173,7 +176,7 @@ function cmdarg_usage
         echo "Required Arguments:"
         for key in "${CMDARG_REQUIRED[@]}"
         do
-	    echo "    $(cmdarg_describe $key)"
+            echo "    $(cmdarg_describe "$key")"
         done
         echo
     fi
@@ -181,7 +184,7 @@ function cmdarg_usage
         echo "Optional Arguments":
         for key in "${CMDARG_OPTIONAL[@]}"
         do
-	    echo "    $(cmdarg_describe $key)"
+            echo "    $(cmdarg_describe "$key")"
         done
     fi
     echo
@@ -215,29 +218,29 @@ function cmdarg_set_opt
     set +u
 
     case ${CMDARG_TYPES[$key]} in
-	$CMDARG_TYPE_STRING)
+        "$CMDARG_TYPE_STRING")
             cmdarg_cfg[$key]=$arg
             cmdarg_validate "$key" "$arg" || ${CMDARG_ERROR_BEHAVIOR} 1
             ;;
-	$CMDARG_TYPE_BOOLEAN)
+        "$CMDARG_TYPE_BOOLEAN")
             cmdarg_cfg[$key]=true
             cmdarg_validate "$key" "$arg" || ${CMDARG_ERROR_BEHAVIOR} 1
             ;;
-	$CMDARG_TYPE_ARRAY)
+        "$CMDARG_TYPE_ARRAY")
             local arrname="${key}"
             local str='${#'"$arrname"'[@]}'
             local prevlen=$(eval "echo $str")
             eval "${arrname}[$((prevlen + 1))]=\"$arg\""
             cmdarg_validate "$key" "$arg" || ${CMDARG_ERROR_BEHAVIOR} 1
             ;;
-	$CMDARG_TYPE_HASH)
+        "$CMDARG_TYPE_HASH")
             local k=${arg%%=*}
             local v=${arg#*=}
             if [[ "$k" == "$arg" ]] && [[ "$v" == "$arg" ]] && [[ "$k" == "$v" ]]; then
                 echo "Malformed hash argument: $arg" >&2
                 ${CMDARG_ERROR_BEHAVIOR} 1
             fi
-	    eval "$key[\$k]=\$v"
+            eval "${key}[\$k]=\$v"
             cmdarg_validate "$key" "$v" "$k" || ${CMDARG_ERROR_BEHAVIOR} 1
             ;;
         *)
@@ -255,18 +258,18 @@ function cmdarg_check_empty
     local type=${CMDARG_TYPES[$longopt]}
 
     case $type in
-	$CMDARG_TYPE_STRING)
+        "$CMDARG_TYPE_STRING")
-            echo ${cmdarg_cfg[$longopt]}
+            echo "${cmdarg_cfg[$longopt]}"
             ;;
-	$CMDARG_TYPE_BOOLEAN)
+        "$CMDARG_TYPE_BOOLEAN")
-	    echo ${cmdarg_cfg[$longopt]}
+            echo "${cmdarg_cfg[$longopt]}"
             ;;
-	$CMDARG_TYPE_ARRAY)
+        "$CMDARG_TYPE_ARRAY")
             local arrname="${longopt}"
             local lval='${!'"${arrname}"'[@]}'
             eval "echo $lval"
             ;;
-	$CMDARG_TYPE_HASH)
+        "$CMDARG_TYPE_HASH")
             local arrname="${longopt}"
             local lval='${!'"${arrname}"'[@]}'
             eval "echo $lval"
@@ -303,7 +306,7 @@ function cmdarg_parse
         fi
 
         if [[ "$fullopt" == "--" ]] && [[ $parsing -eq 0 ]]; then
-	    cmdarg_argv+=($@)
+            cmdarg_argv+=("$@")
             break
         elif [[ "${fullopt:0:2}" == "--" ]]; then
             longopt=${fullopt:2}
@@ -316,7 +319,7 @@ function cmdarg_parse
             continue
         else
             echo "Malformed argument: ${fullopt}" >&2
-	    echo "While parsing: $@" >&2
+            echo "While parsing: $*" >&2
             ${cmdarg_helpers['usage']} >&2
             ${CMDARG_ERROR_BEHAVIOR} 1
         fi
@@ -326,7 +329,7 @@ function cmdarg_parse
                 ${CMDARG_ERROR_BEHAVIOR} 1
             fi
 
-	if [[ $is_equals_arg -eq 1 ]]; then
+        if [[ $is_equals_arg -eq 1 && -n "$opt" ]]; then
             if [[ ${CMDARG_FLAGS[$opt]} -eq ${CMDARG_FLAG_REQARG} ]] || \
                 [[ ${CMDARG_FLAGS[$opt]} -eq ${CMDARG_FLAG_OPTARG} ]]; then
                 optarg=$1
@@ -334,10 +337,10 @@ function cmdarg_parse
             fi
         fi
 
-	if [ ${CMDARG["${opt}"]+abc} ]; then
+        if [ -n "$opt" ] && [ ${CMDARG["${opt}"]+abc} ]; then
             cmdarg_set_opt "${CMDARG[$opt]}" "$optarg"
             local rc=$?
-	    failed=$((failed + $rc))
+            failed=$((failed + rc))
             else
             echo "Unknown argument or invalid value : -${opt} | --${longopt}" >&2
                 ${cmdarg_helpers['usage']} >&2
@@ -351,7 +354,7 @@ function cmdarg_parse
     local key
     for key in "${CMDARG_REQUIRED[@]}"
     do
-	if [[ "$(cmdarg_check_empty $key)" == "" ]]; then
+        if [[ "$(cmdarg_check_empty "$key")" == "" ]]; then
             missing="${missing} -${key}"
             failed=$((failed + 1))
         fi
@@ -374,7 +377,7 @@ function cmdarg_traceback
     local FRAMES=${#BASH_LINENO[@]}
     # FRAMES-2 skips main, the last one in arrays
     for ((i=FRAMES-2; i>=1; i--)); do
-	echo '  File' \"${BASH_SOURCE[i+1]}\", line ${BASH_LINENO[i]}, probably in ${FUNCNAME[i+1]} >&2
+        echo "  File \"${BASH_SOURCE[i+1]}\", line ${BASH_LINENO[i]}, probably in ${FUNCNAME[i+1]}" >&2
         # Grab the source code of the line
         sed -n "${BASH_LINENO[i]}{s/^/    /;p}" "${BASH_SOURCE[i+1]}" >&2
     done
@@ -392,10 +395,10 @@ function cmdarg_dump
     local ref
     local value
 
-    for key in ${!cmdarg_cfg[@]}
+    for key in "${!cmdarg_cfg[@]}"
     do
         repr="${key}:${CMDARG_TYPES[$key]}"
-	if [[ ${CMDARG_TYPES[$key]} == $CMDARG_TYPE_ARRAY ]] || [[ ${CMDARG_TYPES[$key]} == $CMDARG_TYPE_HASH ]] ; then
+        if [[ ${CMDARG_TYPES[$key]} == "$CMDARG_TYPE_ARRAY" ]] || [[ ${CMDARG_TYPES[$key]} == "$CMDARG_TYPE_HASH" ]] ; then
             arrname="${key}"
             echo "${repr} => "
             keys='${!'"$arrname"'[@]}'

tests/test_types.sh

@@ -86,7 +86,7 @@ function shunittest_hash_values
 	cmp="$cmp ${k}=${hash[$k]}"
     done
     cmp=$(echo "$cmp" | sed s/'^ *'//)
-    if [[ "$cmp" == "$base" ]]; then
+    if [[ "$cmp" != "$base" ]]; then
     	echo "Hash does not contain expected arguments ($cmp vs $base)"
     	cmdarg_dump >&2
     	return 1