Add scandir option (#28)

README.md

@@ -80,10 +80,23 @@ all files at once:
 ```yaml
     ...
     - name: Run ShellCheck
-    uses: ludeeus/action-shellcheck@master
-    with:
-      check_together: 'yes'
+      uses: ludeeus/action-shellcheck@master
+      with:
+        check_together: 'yes'
 ```
 
 This can turn into a problem if you have enough script files to overwhelm the
 maximum argv length on your system.
+
+## Run shellcheck only in a single directory
+
+If you have multiple directories with scripts, but only want to scan
+one of them, you can use the following configuration:
+
+```yaml
+   ...
+   - name: Run ShellCheck
+     uses: ludeeus/action-shellcheck@master
+     with:
+       scandir: './scripts'
+```

action.yaml

@@ -14,6 +14,10 @@ inputs:
     description: 'Run shellcheck on _all_ files at once, instead of one at a time'
     required: false
     default: ''
+  scandir:
+    description: 'Directory to be searched for files. Defaults to .'
+    required: false
+    default: '.'
 runs:
   using: 'docker'
   image: 'Dockerfile'

runaction

@@ -13,6 +13,7 @@ declare -a filepaths
 declare -a excludes
 declare -a tmp
 
+INPUT_SCANDIR="${INPUT_SCANDIR:-.}"
 statuscode=0
 shebangregex="^#! */[^ ]*/(env *)?[abkz]*sh"
 
@@ -26,7 +27,7 @@ for path in ${INPUT_IGNORE}; do
     excludes+=(! -path "*/${path}/*" )
 done
 
-readarray -d '' filepaths < <(find . -type f "${excludes[@]}" \
+readarray -d '' filepaths < <(find "${INPUT_SCANDIR}" -type f "${excludes[@]}" \
     '(' \
     \
     -name '*.bash' \
@@ -59,19 +60,20 @@ readarray -d '' filepaths < <(find . -type f "${excludes[@]}" \
     \
     -print0)
 
-readarray -d '' tmp < <(find . "${excludes[@]}" -type f ! -name '*.*' -perm /111  -print0)
+
+readarray -d '' tmp < <(find "${INPUT_SCANDIR}" "${excludes[@]}" -type f ! -name '*.*' -perm /111  -print0)
 for file in "${tmp[@]}"; do
     head -n1 "$file" | grep -Eqs "$shebangregex" || continue
     filepaths+=("$file")
 done
 
-if  find . "${excludes[@]}" -path '*bin/*/*' -type f -perm /111 -print |
+if  find "${INPUT_SCANDIR}" "${excludes[@]}" -path '*bin/*/*' -type f -perm /111 -print |
     grep .
 then
     echo >&2 "::warning:: subdirectories of bin directories are not usable via PATH"
 fi
 
-if  find . "${excludes[@]}" -path '*bin/*' -name '*.*' -type f -perm /111 -perm /444 -print |
+if  find "${INPUT_SCANDIR}" "${excludes[@]}" -path '*bin/*' -name '*.*' -type f -perm /111 -perm /444 -print |
     grep .
 then
     echo >&2 "::warning:: programs in PATH should not have a filename suffix"