Ignore theme specific lines in git using a filter

scripts/.local/share/scripts/git-ignore-line.sh

@@ -0,0 +1,87 @@
+#!/bin/sh
+# Git filter to ignore lines in your files.
+#
+# Copyright (c) 2017-2019 Aryel Mota Góis <aryel.gois@gmail.com>
+#
+# MIT License
+#
+#
+# SETUP:
+#
+#     cp git-ignore-line.sh ~/bin/git-ignore-line
+#
+#
+# USAGE:
+#
+# Mark single lines you want to ignore with 'GITIGNORE'. It ignores
+# the whole line. It is recommended to be inside a comment in your code.
+#
+# Mark multiple lines surrounding them with 'GITIGNORE START' and
+# 'GITIGNORE END'. It can not be nested.
+#
+# NOTE: Ignored lines might be lost on checkout.
+#
+#
+# Add files to ignore:
+#
+#     git ignore-line <pattern>
+#
+# Remove patterns with:
+#
+#     git ignore-line -r <pattern>
+#
+# List configured patterns:
+#
+#     git ignore-line -l
+#
+# PATTERN can be a file or a glob pattern: '*.html'. Remember to
+# escape the `*`.
+#
+#
+# TODO:
+#
+# - Stash the lines ignored by this filter before a git checkout.
+
+
+set -eu
+
+
+# Check if stdin is not tty and remove ignored lines from it.
+
+[ -t 0 ] || exec sed \
+    '/GITIGNORE START/,/GITIGNORE END/d; /GITIGNORE/d' \
+    /dev/stdin
+
+
+# Running from tty.
+
+program=$(basename "$0")
+
+# Find git repository.
+git_dir=$(git rev-parse --git-dir)
+
+# Path to attributes file.
+attr_file=$git_dir/info/attributes
+
+# Check arguments.
+if [ $# -eq 2 ] && [ "$1" = '-r' ]; then
+    # Remove filter for pattern.
+    sed "s|^$2 filter=$program||" "$attr_file" > "$attr_file.tmp"
+    mv -- "$attr_file.tmp" "$attr_file"
+elif [ $# -eq 1 ]; then
+    if [ "$1" = '-l' ]; then
+        # List patterns.
+        grep "filter=$program" "$attr_file" || true
+    else
+        # Add filter for pattern.
+        echo "$1 filter=$program" >> "$attr_file"
+        # Configure filter.
+        git config --global "filter.$program.clean" "$program"
+        git config --global "filter.$program.smudge" cat
+    fi
+else
+    # Show help.
+    >&2 echo "Usage: $program [-r] <pattern>"
+    >&2 echo "  or:  $program -l"
+    exit 1
+fi