Add AMReX style CI and EditorConfig file (#1349)

https://editorconfig.org/ has instructions on setting up your editor to follow the configured style.

.editorconfig

@@ -0,0 +1,62 @@
+# http://EditorConfig.org
+#
+# precedence of rules is bottom to top
+
+# this is the top-most EditorConfig file
+root = true
+
+
+[*.{c,h,cpp,hpp,H,py}]
+# 4 space indentation
+indent_style = space
+indent_size = 4
+
+# Clean up trailing whitespace
+trim_trailing_whitespace = true
+
+# unix-style newlines
+end_of_line = lf
+
+# newline ending in files
+insert_final_newline = true
+
+[networks/**/reaclib_rates.H]
+# some reaclib rate labels have trailing spaces
+trim_trailing_whitespace = false
+
+
+[*.md]
+# two end of line whitespaces are newlines without a paragraph
+trim_trailing_whitespace = false
+
+
+[*.rst]
+# Enforce UTF-8 encoding
+charset = utf-8
+
+# Unix-style newlines
+end_of_line = lf
+
+# Newline ending in files
+insert_final_newline = true
+
+# 3 space indentation
+indent_style = space
+indent_size = 3
+
+# Clean up trailing whitespace
+trim_trailing_whitespace = true
+
+[{Makefile,GNUmakefile,Make.*}]
+# TABs are part of its syntax
+indent_style = tab
+indent_size = unset
+
+
+[util/gcem/**]
+# don't mess with the gcem subtree
+indent_style = unset
+indent_size = unset
+trim_trailing_whitespace = unset
+end_of_line = unset
+insert_final_newline = unset

.git-blame-ignore-revs

@@ -0,0 +1,2 @@
+# Replaced tabs with spaces and trimmed trailing whitespace
+5a2247f598f88f80ad8b186188fccfd5537b18d3

.github/workflows/style.yml

@@ -0,0 +1,22 @@
+name: Style
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.head_ref }}-style
+  cancel-in-progress: true
+
+jobs:
+  tabs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Tabs
+        run: .github/workflows/style/check_tabs.sh
+
+  trailing_whitespaces:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Trailing Whitespaces
+        run: .github/workflows/style/check_trailing_whitespaces.sh

.github/workflows/style/check_tabs.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+set -eu -o pipefail
+
+find . -type d \( -name .git \
+                  -o -path ./paper \
+                  -o -name build -o -name install \
+                  -o -name tmp_build_dir -o -name tmp_install_dir \
+               \) -prune -o \
+       -type f \( \( -name "*.H" -o -name "*.h" -o -name "*.hh" -o -name "*.hpp" \
+                  -o -name "*.c" -o -name "*.cc" -o -name "*.cpp" -o -name "*.cxx" \
+                  -o -name "*.f" -o -name "*.F" -o -name "*.f90" -o -name "*.F90" \
+                  -o -name "*.py" \
+                  -o -name "*.md" -o -name "*.rst" \
+                  -o -name "*.sh" \
+                  -o -name "*.tex" \
+                  -o -name "*.txt" \
+                  -o -name "*.yml" \) \
+                 -a \( ! -name "*.tab.h" -a ! -name "*.tab.nolint.H" \
+                    -a ! -name "*.lex.h" -a ! -name "*.lex.nolint.H" \) \
+               \) \
+    -exec grep -Iq . {} \; \
+    -exec sed -i 's/\t/\ \ \ \ /g' {} +
+
+gitdiff=`git diff`
+
+if [ -z "$gitdiff" ]
+then
+    exit 0
+else
+    echo -e "\nTabs are not allowed. Changes suggested by"
+    echo -e "  ${0}\n"
+    git --no-pager diff
+    echo ""
+    exit 1
+fi

.github/workflows/style/check_trailing_whitespaces.sh

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+#!/usr/bin/env bash
+
+set -eu -o pipefail
+
+find . -type d \( -name .git \
+                  -o -path ./paper \
+                  -o -name build -o -name install \
+                  -o -name tmp_build_dir -o -name tmp_install_dir \
+                  -o -path ./util/gcem \
+               \) -prune -o \
+       -type f \( \( -name "*.H" -o -name "*.h" -o -name "*.hh" -o -name "*.hpp" \
+                  -o -name "*.c" -o -name "*.cc" -o -name "*.cpp" -o -name "*.cxx" \
+                  -o -name "*.f" -o -name "*.F" -o -name "*.f90" -o -name "*.F90" \
+                  -o -name "*.py" \
+                  -o -name "*.rst" \
+                  -o -name "*.sh" \
+                  -o -name "*.tex" \
+                  -o -name "*.txt" \
+                  -o -name "*.yml" \) \
+                 -a \( ! -name "*.tab.h" -a ! -name "*.tab.nolint.H" \
+                    -a ! -name "*.lex.h" -a ! -name "*.lex.nolint.H" \
+                    -a ! -path "./networks/*/reaclib_rates.H" \) \
+               \) \
+    -exec grep -Iq . {} \; \
+    -exec sed -i 's/[[:blank:]]\+$//g' {} +
+
+gitdiff=`git diff`
+
+if [ -z "$gitdiff" ]
+then
+    exit 0
+else
+    echo -e "\nTrailing whitespaces at the end of a line are not allowed. Changes suggested by"
+    echo -e "  ${0}\n"
+    git --no-pager diff
+    echo ""
+    exit 1
+fi