Added license

The program doesn't seem to work on Windows, and I don't have the time
right now to debug it. So, at the moment, the program isn't supported on Windows.

.gitignore

@@ -1,2 +1,3 @@
 ccat
+*.zip
 

LICENSE.md

@@ -0,0 +1,8 @@
+Copyright 2025 Aadhavan Srinivasan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

README.md

@@ -0,0 +1,73 @@
+## ccat
+
+ccat is a file printing tool (like 'cat') which uses Regular Expressions to enable syntax highlighting.
+
+---
+
+### Features
+- 11 colors are defined out-of-the-box: RED, BLUE, GREEN, MAGENTA, CYAN, BLACK, WHITE, YELLOW, GRAY, ORANGE and DARKBLUE.
+- Support for defining custom colors via the `ccat.colors` file.
+- Regex-color mappings are stored in configuration files.
+- Uses the file extension to determine which configuration file to use.
+- Highly extensible - to add a config file for an specific file type, name the file `<extension>.conf`.
+- Support for printing line numbers with the `-n` flag.
+- Statically linked Go binary - no runtime dependencies, config files are distributed along with the binary.
+- Linux and MacOS supported.
+
+---
+
+### Installing
+
+Download the appropriate zip-file from the 'Releases' section. Place the executable in your PATH.
+
+NOTE: The releases are not available on the GitHub repo (which is a mirror of https://gitea.twomorecents.org/Rockingcool/ccat). Obtain the [releases](https://gitea.twomorecents.org/Rockingcool/ccat/releases) from there instead.
+
+---
+
+### Building from source
+
+If you have the `go` command installed, run `make` after cloning the repository.
+
+---
+
+### Supported Languages
+
+The following languages have config files included by default:
+
+- C
+- Go
+
+---
+
+### Getting Started
+The config files are embedded within the binary. They will automatically be installed to the correct location (`~/.config/ccat` on UNIX) when the program is first run.
+
+As written above, if provided a file with extension `.example`, the program will look for the config file named `example.conf`. If such a file doesn't exist, the file is printed out without any highlighting.
+
+For example, if you want to create syntax highlighting for Java, create a file named `java.conf` in your config directory. In this file, include regular-expressions for each of the langauges's keywords, and provide a corresponding color. Use the provided `c.conf` and `go.conf` files as a starting point.
+
+---
+
+### Config Files
+
+The config files are written in YAML. Each line has the following syntax:
+
+`"<regex>": COLOR`
+
+Note that the regex must be enclosed in double quotes, and the color must be capitalized.
+
+---
+
+### Custom Colors
+
+To define a color of your own, create a file named `ccat.colors` in the config directory (mentioned above). The syntax of this file is the following:
+
+`COLOR: <red> <green> <blue>`
+
+Note that the color name must be capitalized (and shouldn't contain spaces). The RGB values must each be from 0 to 255.
+
+---
+
+### TODO:
+- Windows support.
+- Allow users to provide a config file in the command-line, overriding the extension-based config file.

color.go

@@ -2,8 +2,12 @@ package main
 
 import (
 	"fmt"
+	"os"
+	"strconv"
+	"strings"
 
 	colorData "github.com/fatih/color"
+	"gopkg.in/yaml.v2"
 )
 
 // A color represents a possible color, which text can be printed out in.
@@ -14,6 +18,14 @@ type color struct {
 	colorObj *colorData.Color
 }
 
+// A RGB represents a Red, Blue, Green trio of values. Each value is represented as
+// an int.
+type RGB struct {
+	red   int
+	blue  int
+	green int
+}
+
 // The following is a list of all possible colors, stored in a map.
 var possibleColors map[string]color = map[string]color{
 	"BLACK":   {"BLACK", colorData.New(colorData.FgBlack)},
@@ -59,3 +71,89 @@ func newColorMust(colorString string) color {
 		return clr
 	}
 }
+
+// isValidColorName returns true if the given string only contains uppercase alphabetic
+// characters.
+func isValidColorName(colorName string) bool {
+	for _, ch := range colorName {
+		if ch > 'Z' || ch < 'A' {
+			return false
+		}
+	}
+	return true
+}
+
+// stringToRGB takes a string representing an RGB trio. It constructs and RGB type and
+// returns it. Any errors encountered are returned. If an error is returned, it is safe to
+// assume that the string doesn't represent an RGB trio.
+func stringToRGB(rgbString string) (*RGB, error) {
+	values := strings.Split(rgbString, " ")
+	// There must be three space-separated strings.
+	if len(values) != 3 {
+		// TODO: Instead of ignoring these errors and returning a generic error (as I do in the
+		// callee), wrap the error returned from this function, inside the error returned by the callee.
+		return nil, fmt.Errorf("Error parsing RGB trio.")
+	}
+	// If any of the strings doesn't represent an integer (or is out of bounds), return an error.
+	// WARNING: LAZY CODE INCOMING
+	var toReturn RGB
+	var err error
+	toReturn.red, err = strconv.Atoi(values[0])
+	if err != nil {
+		return nil, fmt.Errorf("Error parsing RED integer: Invalid value.")
+	}
+	if toReturn.red < 0 || toReturn.red > 255 {
+		return nil, fmt.Errorf("Error parsing RED integer: Out-of-bounds.")
+	}
+	toReturn.blue, err = strconv.Atoi(values[1])
+	if err != nil {
+		return nil, fmt.Errorf("Error parsing BLUE integer: Invalid value.")
+	}
+	if toReturn.blue < 0 || toReturn.blue > 255 {
+		return nil, fmt.Errorf("Error parsing BLUE integer: Out-of-bounds.")
+	}
+	toReturn.green, err = strconv.Atoi(values[2])
+	if err != nil {
+		return nil, fmt.Errorf("Error parsing GREEN integer: Invalid value.")
+	}
+	if toReturn.green < 0 || toReturn.green > 255 {
+		return nil, fmt.Errorf("Error parsing GREEN integer: Out-of-bounds.")
+	}
+	return &toReturn, nil
+}
+
+// loadColorsFromFile loads the colors defined in the given config file, and adds them to
+// the possibleColors map. This allows the user to define custom colors at run-time.
+// The colors config file has the following syntax:
+// COLOR: <RED> <GREEN> <BLUE>
+//
+// Note that the color must be capitalized (and not contain spaces), and the R, G and B
+// values must be from 0 to 255.
+func loadColorsFromFile(filepath string) error {
+	data, err := os.ReadFile(filepath)
+	if err != nil {
+		panic(err)
+	}
+	// Read color config file into a MapSlice
+	tempMapSlice := yaml.MapSlice{}
+	if err := yaml.Unmarshal(data, &tempMapSlice); err != nil {
+		return fmt.Errorf("Unable to read color config file: %s", filepath)
+	}
+
+	for _, item := range tempMapSlice {
+		if !(isValidColorName(item.Key.(string))) {
+			return fmt.Errorf("Invalid color name: %s", item.Key.(string))
+		}
+		var rgb *RGB
+		if rgb, err = stringToRGB(item.Value.(string)); err != nil {
+			return fmt.Errorf("Invalid RGB trio: %s", item.Value.(string))
+		}
+		// If we haven't returned an error yet, the color must be valid.
+		// Add it to the map. colorData.New() expects values of type colorData.Attribute,
+		// so we must cast our RGB values accordingly.
+		possibleColors[item.Key.(string)] = color{item.Key.(string), colorData.New(38, 2, colorData.Attribute(rgb.red), colorData.Attribute(rgb.blue), colorData.Attribute(rgb.green))}
+
+	}
+
+	return nil
+}

config.go

@@ -1,12 +1,11 @@
 package main
 
 import (
-	"ccat/stack"
 	"embed"
 	"errors"
+	"gitea.twomorecents.org/Rockingcool/ccat/stack"
 	"io/fs"
 	"os"
-	"os/user"
 	"path/filepath"
 	"regexp"
 	"runtime"
@@ -18,27 +17,18 @@ import (
 //go:embed config
 var storedConfigs embed.FS // Embed the folder containing config files
 
+// runningOnWindows: At the moment this function isn't used. When Window support is added,
+// it will be used to determine if the program is being run on Windows.
 func runningOnWindows() bool {
 	return runtime.GOOS == "windows"
 }
 
 // generateDefaultConfigs is used to generate a folder of default config files
 // for common languages. These default config files are embedded into the program, and will
-// be outputted into a directory.
+// be outputted into the given directory.
 //
 // If there is an error encountered, the error is returned.
-func generateDefaultConfigs() error {
-
-	var configOutputPath string // Location of config files, depends on OS
-	if runningOnWindows() {
-		configOutputPath = "%APPDATA%\\ccat"
-	} else {
-		currentUser, err := user.Current()
-		if err != nil {
-			panic(err)
-		}
-		configOutputPath = filepath.Join("/home/" + currentUser.Username + "/.config/ccat/")
-	}
+func generateDefaultConfigs(configOutputPath string) error {
 	err := os.MkdirAll(configOutputPath, 0755)
 	if err != nil {
 		if os.IsExist(err) {

config/c.conf

@@ -10,11 +10,13 @@
 # Strings in double quotes and single quotes
 '"(.*?)"': BLUE
 "'(.)'": BLUE
+# Text inside angle-brackets (used in 'include' statements)
+'\<(.*?)\>': BLUE
 # Assignments and comparisons
 # TODO: Add less than, greater than, not equal to, and struct pointer member access
 '(?:\s|\b)(=|==|!=|<=|>=|\->)(\s|\b)' : CYAN
 # Keywords
 '\b(if|else|while|do|for|return)\b': CYAN
-'^(#ifdef|#ifndef|#define|#include)\b': CYAN
+'(\n|^)(#ifdef|#ifndef|#define|#include)\b': CYAN
 # Data Types
 '\b(int|char|float|double|void|long|short|unsigned|signed|bool)\b': YELLOW

create_release_builds.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -euo pipefail
+
+POSSIBLE_GOOS=( "linux" "darwin" )
+POSSIBLE_GOARCH=( "amd64" "arm64" )
+
+for OS in "${POSSIBLE_GOOS[@]}"; do
+	for ARCH in "${POSSIBLE_GOARCH[@]}"; do
+		FOLDER_NAME="ccat-$OS-$ARCH"
+		mkdir "${FOLDER_NAME}"
+		GOOS=$OS GOARCH=$ARCH go build -o "${FOLDER_NAME}/"
+		zip -r "${FOLDER_NAME}" "${FOLDER_NAME}"
+		rm -r "${FOLDER_NAME}"
+	done
+done
+

go.mod

@@ -1,4 +1,4 @@
-module ccat
+module gitea.twomorecents.org/Rockingcool/ccat
 
 go 1.22.5
 

main.go

@@ -78,18 +78,13 @@ func main() {
 	flag.Parse()
 
 	// Check if config exists. If it doesn't, generate the config files.
-	var configPath string // Location of config files, depends on OS
-	if runningOnWindows() {
-		configPath = "%APPDATA%\\ccat"
-	} else {
-		currentUser, err := user.Current()
-		if err != nil {
-			panic(err)
-		}
-		configPath = filepath.Join("/home/" + currentUser.Username + "/.config/ccat/")
+	currentUser, err := user.Current() // Get current user, to determine config path
+	if err != nil {
+		panic(err)
 	}
+	configPath := filepath.Join("/home/" + currentUser.Username + "/.config/ccat/")
 	if _, err := os.Stat(configPath); os.IsNotExist(err) {
-		generateDefaultConfigs()
+		generateDefaultConfigs(configPath)
 	}
 
 	// Check if user has provided a file name
@@ -120,6 +115,13 @@ func main() {
 	}
 
 	// Assuming the file is not empty...
+	// If a ccat.colors file exists in the config directory, load all the colors in it
+	if fileExists(filepath.Join(configPath, "ccat.colors")) {
+		err := loadColorsFromFile(filepath.Join(configPath, "ccat.colors"))
+		if err != nil {
+			printErrAndExit(err.Error())
+		}
+	}
 	// If the given file has a config, load the config into a stack of regColors.
 	regColorStack, err := loadConfig(configFilename)
 	if err != nil {

test.c

@@ -1,173 +0,0 @@
-//go:build exclude
-#include "easysock.h"
-
-
-int create_socket(int network, char transport) {
-	int domain;
-	int type;
-
-	if (network == 4) {
-		domain = AF_INET;
-	} else if (network == 6) {
-		domain = AF_INET6;
-	} else {
-		return -1;
-	}
-
-	if (transport == 'T') {
-		type = SOCK_STREAM;
-	} else if (transport == 'U') {
-		type = SOCK_DGRAM;
-	} else {
-		return -1;
-	}
-
-	int newSock = socket(domain,type,0);
-	return newSock;
-}
-
-
-int create_addr(int network, char* address, int port,struct sockaddr* dest) {
-	if (network == 4) {
-		struct sockaddr_in listen_address;
-
-		listen_address.sin_family = AF_INET;
-		listen_address.sin_port = htons(port);
-		inet_pton(AF_INET,address,&listen_address.sin_addr);
-		memcpy(dest,&listen_address,sizeof(listen_address));
-		return 0;
-
-	} else if (network == 6) {
-		struct sockaddr_in6 listen_ipv6;
-		listen_ipv6.sin6_family = AF_INET6;
-		listen_ipv6.sin6_port = htons(port);
-		inet_pton(AF_INET6,address,&listen_ipv6.sin6_addr);
-		memcpy(dest,&listen_ipv6,sizeof(listen_ipv6));
-		return 0;
-
-	} else {
-		return -202;
-	}
-
-
-
-}
-
-int create_local (int network, char transport, char* address, int port,struct sockaddr* addr_struct) {
-	int socket = create_socket(network,transport);
-	if (socket < 0) {
-		return (-1 * errno);
-	}
-	create_addr(network,address,port,addr_struct);
-	int addrlen;
-	if (network == 4) {
-		addrlen = sizeof(struct sockaddr_in);
-	} else if (network == 6) {
-		addrlen = sizeof(struct sockaddr_in6);
-	} else {
-		return -202;
-	}
-
-	/* The value of addrlen should be the size of the 'sockaddr'.
-	This should be set to the size of 'sockaddr_in' for IPv4, and 'sockaddr_in6' for IPv6.
-	See https://stackoverflow.com/questions/73707162/socket-bind-failed-with-invalid-argument-error-for-program-running-on-macos */
-
-	int i = bind (socket,addr_struct,(socklen_t)addrlen);
-	if (i < 0) {
-		return (-1 * errno);
-	}
-	return socket;
-}
-
-int create_remote (int network,char transport,char* address,int port,struct sockaddr* remote_addr_struct) {
-
-	struct addrinfo hints;  /* Used to tell getaddrinfo what kind of address we want */
-	struct addrinfo* results; /* Used by getaddrinfo to store the addresses */
-
-
-	if (check_ip_ver(address) < 0) { /* If the address is a domain name */
-		int err_code;
-		char* port_str = malloc(10 * sizeof(char));
-
-		sprintf(port_str,"%d",port); /* getaddrinfo expects a string for its port */
-
-
-		memset(&hints,'\0',sizeof(hints));
-		hints.ai_socktype = char_to_socktype(transport);
-
-		err_code = getaddrinfo(address,port_str,&hints,&results);
-		if (err_code != 0) {
-			return (-1 * err_code);
-		}
-		remote_addr_struct = results->ai_addr;
-		network = inet_to_int(results->ai_family);
-	} else {
-	        create_addr(network,address,port,remote_addr_struct);
-	}
-
-	int socket = create_socket(network,transport);
-	if (socket < 0) {
-                return (-1 * errno);
-        }
-
-       	int addrlen;
-	if (network == 4) {
-		addrlen = sizeof(struct sockaddr_in);
-	} else if (network == 6) {
-		addrlen = sizeof(struct sockaddr_in6);
-	} else {
-		return (-202);
-	}
-
-	/* The value of addrlen should be the size of the 'sockaddr'.
-	This should be set to the size of 'sockaddr_in' for IPv4, and 'sockaddr_in6' for IPv6.
-	See https://stackoverflow.com/questions/73707162/socket-bind-failed-with-invalid-argument-error-for-program-running-on-macos */
-
-        int i = connect(socket,remote_addr_struct,(socklen_t)addrlen);
-	if (i < 0) {
-		return (-1 * errno);
-	}
-        return socket;
-}
-
-
-int check_ip_ver(char* address) {
-	char buffer[16]; /* 16 chars - 128 bits - is enough to hold an ipv6 address */
-	if (inet_pton(AF_INET,address,buffer) == 1) {
-		return 4;
-	} else if (inet_pton(AF_INET6,address,buffer) == 1) {
-		return 6;
-	} else {
-		return -1;
-	}
-}
-
-int int_to_inet(int network) {
-	if (network == 4) {
-		return AF_INET;
-	} else if (network == 6) {
-		return AF_INET6;
-	} else {
-		return -202;
-	}
-}
-
-int inet_to_int(int af_type) {
-	if (af_type == AF_INET) {
-		return 4;
-	} else if (af_type == AF_INET6) {
-		return 6;
-	} else {
-		return -207;
-	}
-}
-
-int char_to_socktype(char transport) {
-	if (transport == 'T') {
-		return SOCK_STREAM;
-	} else if (transport == 'U') {
-		return SOCK_DGRAM;
-	} else {
-		return -250;
-	}
-}