grep the presence of some expression but specifically in text files, should not attempt to search binaries (not thoroughly tested)

t-grep

#!/bin/bash

search_exp=$1
search_path=$2

# if search path is not provided,
# use current directory and signify it to the user

if [ -z "$search_path" ]; then
    search_path="."
    echo "No search path provided, using current directory"
    echo
fi

# if search expression is not provided,
# exit with error and display usage message to the user

if [ -z "$search_exp" ]; then
    echo "Usage: t-grep <search_expression> [search_path]"
    echo
    echo "Searches for the given expression in text files in the given path."
    echo "If no path is provided, searches in the current directory."
    echo "The <search_expression> is obviously mandatory."
    echo
    echo "There will probably be access rights errors as usual with find and grep, "
    echo "they will not be displayed here."
    exit 1
fi

echo "Searching for \"$search_exp\" in \"$search_path\", considering only text files..."
echo

find "$search_path" \
    -type f \
    -exec sh -c "file -b --mime-type \"\$1\" | grep -q \"text/\" && \
        grep -q -E \".{0,10}$search_exp.{0,10}\" \"\$1\" && \
        echo \"In file '\033[1;34m\$1\033[0m':\" && \
        grep --color=auto -E -o \".{0,10}$search_exp.{0,10}\" \"\$1\"" _ {} \; \
    2>/dev/null