Initial import

Dockefile

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+FROM ubuntu:latest
+
+LABEL maintainer="underwoo"
+
+RUN apt-get update && \
+    apt-get install -y shellcheck \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY lint.sh lint.sh
+COPY whitespace_check.sh whitespace_check.sh
+COPY ftn_tab_check.sh ftn_tab_check.sh
+
+ENTRYPOINT ["/lint.sh"]

README.md

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+# Simple Lint GitHub Action
+
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+
+This project runs simple lint-like actions on files in a git repository.  The
+current list of lint actions are:
+
+* check for trailing whitespace
+* check Fortran files for use of tab characters
+
+## Example
+
+```yaml
+# This workflow will check files in the repository for trailing whitespace and
+# Fortran files that use tabs
+
+name: Simple Lint
+
+on: [push, pull_request]
+
+jobs:
+   lint:
+      steps:
+         - uses: actions/checkout@v2
+         - name: Whitespace Lint
+           id: wslint
+           uses: underwoo/simple-lint@v1
+           with:
+             failure: false
+         - if: ! ${{ steps.wslint.outputs.lintSuccess }}
+           run: exit 1
+```

action.yml

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+name: "Fortran Lint"
+description: "Simple Fortran Lint, currently checks for trailing whitespace and Tab characters"
+inputs:
+   failure:
+      description: "Cause action to fail if lint errors found"
+      required: false
+      default: true
+outputs:
+   lintSuccess:
+      description: "indicates if the the lint processes passed (true) or failed (false)"
+runs:
+   using: "docker"
+   image: "Dockerfile"
+   args: ["${{ inputs.failure }}"]
+branding:
+   icon: "shield"
+   color: "blue"
+
+
+
+# find . -type f -exec file {} \; | grep '\(Bourne-Again\|POSIX\|Korn\) shell' | awk -F : '{print $1}'

ftn_tab_check.sh

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+#!/bin/sh
+
+# Copyright (C) 2020 Seth Underwood
+#
+# This file is part of Simple Lint.
+#
+# Simple Lint is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Simple Lint is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Foobar.  If not, see <https://www.gnu.org/licenses/>.
+
+# Find all Fortran files (using the file extensions listed below) and check
+# if they files use a tab character.  Print the files that do contain a
+# tab character to standard out.
+# File extensions use:
+#  * .f .F
+#  * .f90 .F90
+#  * .inc .INC
+#  * .fh .FH
+#  * .for .FOR
+find -O3 . -iregex ".*\.\(f\(90\)?\|inc\|fh\|for\)$" \
+    -exec grep -l $'\t' {} \;

lint.sh

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+#!/bin/sh
+
+# Copyright (C) 2020 Seth Underwood
+#
+# This file is part of Simple Lint.
+#
+# Simple Lint is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Simple Lint is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Foobar.  If not, see <https://www.gnu.org/licenses/>.
+
+# Check for files that have trailing whitespace
+/whitespace_check.sh | tee /tmp/ws.out
+ws_nfiles=$(wc -l /tmp/ws.out | awk '{print $1}')
+if test $ws_nfiles -gt 0
+then
+   echo "::error::${ws_nfiles} file(s) contain(s) trailing whitespace"
+   cat /tmp/ws.out
+fi
+
+# Check for Fortran files with tabs
+/ftn_tab_check.sh | tee /tmp/ftab.out
+ftab_nfiles=$(wc -l /tmp/ftab.out | awk '{print $1}')
+if test $ftab_nfiles -gt 0
+then
+   echo "::error::${ftab_nfiles} Fortran file(s) contain(s) tab characters"
+   cat /tmp/ftab.out
+fi
+
+# Prepare action output, and exit non-zero if requested to fail
+if test $ws_nfiles -gt 0 || test $ftab_nfiles -gt 0
+then
+   echo "::set-output name=lintSuccess::false"
+   if test "$0" = "true"
+   then
+      exit 1
+   fi
+else
+   echo "::set-output name=lintSuccess::true"
+fi

whitespace_check.sh

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+#!/bin/sh
+
+# Copyright (C) 2020 Seth Underwood
+#
+# This file is part of Simple Lint.
+#
+# Simple Lint is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Simple Lint is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Foobar.  If not, see <https://www.gnu.org/licenses/>.
+
+# Find all files in the working directory, ignoring the `.git` directory that
+# have trailing whitespace, and prints them to standard out.
+find . -type f -not -path "./.git/*" -exec egrep -l " +$" {} \;