add script bin/ocelot

bin/ocelot

@@ -0,0 +1,150 @@
+#!/bin/bash
+
+# Strict mode
+set -euo pipefail
+IFS=$'\n\t'
+
+BASENAME=$(basename $0)
+
+# Global options
+STYLE=singleline
+PREFIX='#'
+
+
+# Helper functions
+# ----------------
+
+# Prints help text
+function usage {
+    cat << END_OF_HELPTEXT
+Usage: $BASENAME [OPTION] FILES...
+
+Prints FILES with their filename as a header. Like cat but more cute.
+
+General options:
+  -h               print this help message
+
+Style options:
+  -b               show big headers (dashed lines above and under filename)
+  -p PREFIX        use PREFIX in front of the header lines (default: '#')
+END_OF_HELPTEXT
+}
+
+# Print a single file with header
+function print_file_with_header {
+    file=$1
+
+    print_header $file
+    print_file $file
+    echo
+}
+
+# Prints a header
+function print_header {
+    text=$1
+    
+    case $STYLE in
+        big)
+            header_style_big "$text"
+            ;;
+
+        singleline | *)
+            header_style_singleline "$text"
+            ;;
+    esac
+}
+
+# Print error message
+function print_error {
+    text=$1
+    echo "$PREFIX [$text]"
+}
+
+# Prints content of file
+function print_file {
+    file=$1
+
+    if [[ -f $file ]]; then
+        cat $file
+    elif [[ -d $file ]]; then
+        print_error "File is a directory"
+    else
+        print_error "File does not exist"
+    fi
+}
+
+
+# Define header styles
+# --------------------
+
+function header_style_singleline {
+    text=$1
+    echo "$PREFIX $text"
+}
+
+function header_style_big {
+    text=$1
+    length=${#text}
+
+    echo -n "$PREFIX "; characterline '-' $length
+    echo    "$PREFIX $text"
+    echo -n "$PREFIX "; characterline '-' $length
+}
+
+# Print a line of characters (e.g. `characterline '#' 32`)
+function characterline {
+    char=$1
+    count=$2
+
+    for (( i = 0; i < $count; i++ )); do echo -n $char; done
+    echo
+}
+
+
+
+# Main program
+# ------------
+
+if [[ "$@" == "--help" ]]; then
+    usage
+    exit 0
+fi
+
+# Parse shell arguments and set global variables
+while getopts ":hbp:" option; do
+    case $option in
+        h)
+            usage
+            exit 0
+            ;;
+
+        b)
+            STYLE=big
+            ;;
+
+        p)
+            PREFIX="$OPTARG"
+            ;;
+
+        :)
+            echo "$BASENAME: option -$OPTARG requires an argument" >&2
+            echo "Try '$BASENAME --help' for more information." >&2
+            exit 1
+            ;;
+
+        ?)
+            echo "$BASENAME: invalid option: -$OPTARG" >&2
+            echo "Try '$BASENAME --help' for more information." >&2
+            exit 1
+            ;;
+    esac
+done
+
+# Remove parsed options from arguments
+shift $(($OPTIND - 1))
+
+# Print all files
+for file in $@; do
+    print_file_with_header $file
+done
+