Updated some regexes for markdown coloring

One of the expressions used .* to mean 'any character except newline', but since I've
enabled 'RE_SINGLE_LINE' mode, a dot matches a newline as well.

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.
+

color.go

@@ -18,12 +18,17 @@ type color struct {
 	colorObj *colorData.Color
 }
 
-// A RGB represents a Red, Blue, Green trio of values. Each value is represented as
-// an int.
+// A RGB represents a Red, Blue, Green trio of values, along with SGR parameters.
+// Each value is represented as an int. For info on SGR parameters, see:
+// https://en.wikipedia.org/wiki/ANSI_escape_code#Select_Graphic_Rendition_parameters
+// If 'red', 'green' and 'blue' are all -1, then the default terminal color is used.
+// If some (but not all) of them are -1, an error is thrown.
 type RGB struct {
+	sgr1  int
 	red   int
 	blue  int
 	green int
+	sgr2  int
 }
 
 // The following is a list of all possible colors, stored in a map.
@@ -33,13 +38,13 @@ var possibleColors map[string]color = map[string]color{
 	"GREEN":   {"GREEN", colorData.New(colorData.FgGreen)},
 	"YELLOW":  {"YELLOW", colorData.New(colorData.FgYellow)},
 	"BLUE":    {"BLUE", colorData.New(colorData.FgBlue)},
-	"MAGENTA": {"MAGENTA", colorData.New(38, 2, 254, 141, 255)},
+	"MAGENTA": {"MAGENTA", colorData.New(colorData.FgMagenta)},
 	"CYAN":    {"CYAN", colorData.New(colorData.FgCyan)},
 	"WHITE":   {"WHITE", colorData.New(colorData.FgWhite)},
 	"GRAY":    {"GRAY", colorData.New(colorData.FgWhite, colorData.Faint)},
 	// Last three numbers are RGB. Reference https://en.wikipedia.org/wiki/ANSI_escape_code for what the first two numbers mean.
-	"ORANGE":   {"ORANGE", colorData.New(38, 2, 255, 153, 28)},
-	"DARKBLUE": {"DARKBLUE", colorData.New(38, 2, 0, 112, 255)},
+//	"ORANGE":   {"ORANGE", colorData.New(38, 2, 255, 153, 28)},
+//	"DARKBLUE": {"DARKBLUE", colorData.New(38, 2, 0, 112, 255)},
 	"NONE":     {"NONE", colorData.New()},
 }
 
@@ -76,59 +81,79 @@ func newColorMust(colorString string) color {
 // characters.
 func isValidColorName(colorName string) bool {
 	for _, ch := range colorName {
-		if ch > 'Z' || ch < 'A' {
+		if (ch > 'Z' || ch < 'A') && (ch != '_') {
 			return false
 		}
 	}
 	return true
 }
 
-// stringToRGB takes a string representing an RGB trio. It constructs and RGB type and
+// stringToRGB takes a string representing an RGB five-tuple. 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.
+// assume that the string doesn't represent an RGB five-tuple.
 func stringToRGB(rgbString string) (*RGB, error) {
 	values := strings.Split(rgbString, " ")
 	// There must be three space-separated strings.
-	if len(values) != 3 {
+	if len(values) != 5 {
 		// 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.")
+		return nil, fmt.Errorf("Error parsing RGB five-tuple.")
 	}
 	// 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])
+	toReturn.sgr1, err = strconv.Atoi(values[0])
+	if err != nil {
+		return nil, fmt.Errorf("Error parsing SGR1 integer: Invalid value.")
+	}
+	if toReturn.sgr1 < 0 || toReturn.sgr1 > 107 { // Maximum value for SGR values
+		return nil, fmt.Errorf("Error parsing SGR1 integer: Out-of-bounds.")
+	}
+	toReturn.red, err = strconv.Atoi(values[1])
 	if err != nil {
 		return nil, fmt.Errorf("Error parsing RED integer: Invalid value.")
 	}
-	if toReturn.red < 0 || toReturn.red > 255 {
+	if toReturn.red < -1 || toReturn.red > 255 {
 		return nil, fmt.Errorf("Error parsing RED integer: Out-of-bounds.")
 	}
-	toReturn.blue, err = strconv.Atoi(values[1])
+	toReturn.blue, err = strconv.Atoi(values[2])
 	if err != nil {
 		return nil, fmt.Errorf("Error parsing BLUE integer: Invalid value.")
 	}
-	if toReturn.blue < 0 || toReturn.blue > 255 {
+	if toReturn.blue < -1 || toReturn.blue > 255 {
 		return nil, fmt.Errorf("Error parsing BLUE integer: Out-of-bounds.")
 	}
-	toReturn.green, err = strconv.Atoi(values[2])
+	toReturn.green, err = strconv.Atoi(values[3])
 	if err != nil {
 		return nil, fmt.Errorf("Error parsing GREEN integer: Invalid value.")
 	}
-	if toReturn.green < 0 || toReturn.green > 255 {
+	if toReturn.green < -1 || toReturn.green > 255 {
 		return nil, fmt.Errorf("Error parsing GREEN integer: Out-of-bounds.")
 	}
+	toReturn.sgr2, err = strconv.Atoi(values[4])
+	if err != nil {
+		return nil, fmt.Errorf("Error parsing SGR2 integer: Invalid value.")
+	}
+	if toReturn.sgr2 < 0 || toReturn.sgr2 > 107 {
+		return nil, fmt.Errorf("Error parsing SGR2 integer: Out-of-bounds.")
+	}
+
+	if !(toReturn.red > 0 && toReturn.blue > 0 && toReturn.green > 0) &&
+		!(toReturn.red == -1 && toReturn.green == -1 && toReturn.blue == -1) {
+		return nil, fmt.Errorf("Error parsing color: All values must be positive or -1 for default terminal color.")
+	}
 	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>
+// COLOR: <SGR1> <RED> <GREEN> <BLUE> <SGR2>
 //
 // Note that the color must be capitalized (and not contain spaces), and the R, G and B
-// values must be from 0 to 255.
+// values must be from -1 to 255 (-1 refers to the default terminal color, and all three values
+// must be -1 for this to work).
 func loadColorsFromFile(filepath string) error {
 	data, err := os.ReadFile(filepath)
 	if err != nil {
@@ -151,8 +176,28 @@ func loadColorsFromFile(filepath string) error {
 		// 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))}
-
+		// First, check if one of the color values is -1. If it is, they must all be negative (based
+		// on the check in 'stringToRGB()'). If this is the case, don't put the color values.
+		if rgb.red == -1 {
+			possibleColors[item.Key.(string)] = color{
+				item.Key.(string),
+				colorData.New(
+					colorData.Attribute(rgb.sgr2),
+				),
+			}
+		} else {
+			possibleColors[item.Key.(string)] = color{
+				item.Key.(string),
+				colorData.New(
+					colorData.Attribute(rgb.sgr1),
+					2,
+					colorData.Attribute(rgb.red),
+					colorData.Attribute(rgb.blue),
+					colorData.Attribute(rgb.green),
+					colorData.Attribute(rgb.sgr2),
+				),
+			}
+		}
 	}
 
 	return nil

config.go

@@ -3,14 +3,15 @@ package main
 import (
 	"embed"
 	"errors"
-	"gitea.twomorecents.org/Rockingcool/ccat/stack"
 	"io/fs"
 	"os"
 	"path/filepath"
-	"regexp"
 	"runtime"
 	"strings"
 
+	"gitea.twomorecents.org/Rockingcool/ccat/stack"
+	"gitea.twomorecents.org/Rockingcool/kleingrep/regex"
+
 	"gopkg.in/yaml.v2"
 )
 
@@ -49,7 +50,7 @@ func generateDefaultConfigs(configOutputPath string) error {
 		relPath, _ := filepath.Rel("config", path)
 		dstPath := filepath.Join(configOutputPath, relPath) // Destination path
 
-		data, err := os.ReadFile(path)
+		data, err := storedConfigs.ReadFile(path)
 		if err != nil {
 			return err
 		}
@@ -87,13 +88,13 @@ func loadConfig(configFilename string) (stack.Stack[regColor], error) {
 	//  returned.
 	regColorStack := stack.NewStack[regColor](len(strings.Split(string(configFile), "\n"))) // The stack will have the same size as the number of lines in the file
 	for _, item := range tempMapSlice {
-		re := regexp.MustCompile(item.Key.(string))
+		re := regex.MustCompile(item.Key.(string), regex.RE_MULTILINE, regex.RE_SINGLE_LINE)
 		clr, err := newColor(item.Value.(string))
 		if err != nil {
 			return *stack.NewStack[regColor](0), err
 		}
 		// If we got past the errors, then the color _must_ be valid.
-		regColorStack.Push(regColor{re, clr})
+		regColorStack.Push(regColor{&re, clr})
 	}
 
 	return *regColorStack, nil

config/c.conf

@@ -10,11 +10,17 @@
 # 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
+'(?:\s|\b)(=|==|!=|\<=|\>=|\->)(\s|\b)' : CYAN
+
+# Built-in boolean values, modifiers
+'\b(static|const|true|false)\b': DARKBLUE
+
 # 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

config/ccat.colors

@@ -0,0 +1,8 @@
+# The first and last fields are SGR values, used to control things
+# like bold and italic text. If you're unsure what to put, use '38'
+# for the first one and '22' for the last one, for normal text.
+# The last three values are R G B values.
+PINK: 38 244 211 244 22
+BOLD_WHITE: 38 -1 -1 -1 1
+ITALIC_WHITE: 38 -1 -1 -1 3
+UNDERLINE_WHITE: 38 -1 -1 -1 4

config/go.conf

@@ -1,7 +1,7 @@
 # Priority decreases going downward ie. If two regexes match the same piece of
 # text, the one defined earlier will take precedence over the one defined later.
 # Comments
-'//.*': GRAY
+'//[^\n]*': GRAY
 '/\*[^*]*\*+(?:[^/*][^*]*\*+)*/': GRAY
 # Numbers and special values
 '\b\-?[0-9]*\b': MAGENTA
@@ -14,15 +14,13 @@
 "'(.)'": BLUE
 "'\\\\(.)'": BLUE # The escape backslash needs to be escaped as well
 # Assignments and comparisons
-'(?:\s|\b)(=|==|!=|<=|>=)(\s|\b)' : CYAN
+'(?:\s|\b)(=|==|!=|\<=|\>=)(\s|\b)' : CYAN
 '(&&)|(\|\|)': CYAN
 # Keywords
 '\b(if|else|for|range|go|func|return|break|continue)\b': CYAN
-'\b(import|var|const|type|struct)\b': CYAN
+'\b(package|import|var|const|type|struct)\b': CYAN
 # Built-in Functions
-'\b(panic|len)\b': DARKBLUE
-# Functions from packages (package name and function name separated by dot)
-'\b(\w*\.\w*)\b': DARKBLUE
+'\b(panic|len)\b': GREEN
 # Data Types
 '\b(bool|byte|rune|string|interface|map|chan)\b': YELLOW
 '\b(u?int)(8|16|32|64)?\b': YELLOW

config/md.conf

@@ -0,0 +1,19 @@
+# Priority decreases going downward ie. If two regexes match the same piece of
+# text, the one defined earlier will take precedence over the one defined later.
+# Headings
+'^#{1,6}.*?$': MAGENTA
+
+# Link text
+'\[.*?\](?=\(.*?\))': UNDERLINE_WHITE
+
+# Link URL
+'https?://\w+\.\w+.*?(?=\))': RED
+
+# Code blocks
+'```(.|\n)+?```': YELLOW
+
+# Bold text
+'\b__[^_]+?__\b': BOLD_WHITE
+
+# Italic text
+'\b_[^_]+?_\b': ITALIC_WHITE

go.mod

@@ -1,11 +1,14 @@
 module gitea.twomorecents.org/Rockingcool/ccat
 
-go 1.22.5
+go 1.23.1
+
+toolchain go1.24.2
 
 require (
-	github.com/fatih/color v1.17.0 // indirect
+	gitea.twomorecents.org/Rockingcool/kleingrep v0.7.0 // indirect
+	github.com/fatih/color v1.18.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
-	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

go.sum

@@ -1,7 +1,13 @@
+gitea.twomorecents.org/Rockingcool/kleingrep v0.6.1 h1:eeryIhh2lDMXsu3D1i95IgW2SPte1DaJxlfmiQjrpsE=
+gitea.twomorecents.org/Rockingcool/kleingrep v0.6.1/go.mod h1:8bcYe2hyjNIDM9J2xnyH5veMCAMzVJQR3c0OkatcEPg=
+gitea.twomorecents.org/Rockingcool/kleingrep v0.7.0 h1:owDJjgulFmg9DmgKBtwZMxdf19wM9VbGchMXq7ZlhIM=
+gitea.twomorecents.org/Rockingcool/kleingrep v0.7.0/go.mod h1:8bcYe2hyjNIDM9J2xnyH5veMCAMzVJQR3c0OkatcEPg=
 github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0=
 github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/fatih/color v1.17.0 h1:GlRw1BRJxkpqUCBKzKOw098ed57fEsKeNjpTe3cSjK4=
 github.com/fatih/color v1.17.0/go.mod h1:YZ7TlrGPkiz6ku9fK3TLD/pl3CpsiFyu8N92HLgmosI=
+github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
+github.com/fatih/color v1.18.0/go.mod h1:4FelSpRwEGDpQ12mAdzqdOukCy4u8WUtOY6lkT/6HfU=
 github.com/go-yaml/yaml v2.1.0+incompatible h1:RYi2hDdss1u4YE7GwixGzWwVo47T8UQwnTLB6vQiq+o=
 github.com/go-yaml/yaml v2.1.0+incompatible/go.mod h1:w2MrLa16VYP0jy6N7M5kHaCkaLENm+P+Tv+MfurjSw0=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
@@ -13,6 +19,8 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
 golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
+golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

main.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"math"
 	"os"
-	"os/user"
 	"path/filepath"
 )
 
@@ -78,11 +77,11 @@ func main() {
 	flag.Parse()
 
 	// Check if config exists. If it doesn't, generate the config files.
-	currentUser, err := user.Current() // Get current user, to determine config path
+	userHomeDir, err := os.UserHomeDir() // Get current user's home directory, to construct config path
 	if err != nil {
 		panic(err)
 	}
-	configPath := filepath.Join("/home/" + currentUser.Username + "/.config/ccat/")
+	configPath := filepath.Join(userHomeDir + "/.config/ccat/")
 	if _, err := os.Stat(configPath); os.IsNotExist(err) {
 		generateDefaultConfigs(configPath)
 	}
@@ -158,13 +157,13 @@ func main() {
 		clr := regclr.clr
 		// Returns an int double-slice, where each slice contains the start and end indices
 		// of the match. In this case, I am finding all the matches of 're' in 'data'.
-		matches := re.FindAllSubmatchIndex(data, -1)
+		matches := re.FindAllSubmatch(string(data))
 		if matches == nil {
 			continue
 		}
 		// For each match, apply the corresponding color to all characters in the match.
 		for _, match := range matches {
-			units = applyColor(units, match[0], match[1], clr)
+			units = applyColor(units, match[0].StartIdx, match[0].EndIdx, clr)
 		}
 	}
 

regcolor.go

@@ -1,10 +1,10 @@
 package main
 
-import "regexp"
+import "gitea.twomorecents.org/Rockingcool/kleingrep/regex"
 
 // A regColor is a regex-color pair. The config file is read
 // into a stack of this data type.
 type regColor struct {
-	re  *regexp.Regexp
+	re  *regex.Reg
 	clr color
 }