commit a1b8560b85d5350c5143b7697916ae939ee0f781
Author: Brian Buller <brian@bullercodeworks.com>
Date:   Tue Jun 7 13:50:33 2022 -0500

    Initial Commit

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b611404
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# go-projecttxt
+
+A Go library for working with project.txt files.
+
+A project.txt file is a plain text file for project management purposes. It stems from the same motivations as todo.txt (http://todotxt.org/ ).
+
+This library is very similar to https://github.com/br0xen/go-todotxt, which is a fork of https://github.com/JamesClonk/go-todotxt.
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..3a4c459
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.bullercodeworks.com/brian/go-projecttxt
+
+go 1.18
diff --git a/project.go b/project.go
new file mode 100644
index 0000000..1464b71
--- /dev/null
+++ b/project.go
@@ -0,0 +1,115 @@
+package projecttxt
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+type Project struct {
+	Id             int    // Internal project id
+	Original       string // Original raw project text
+	Name           string // The name of the project
+	Directory      string // The directory part of the project text
+	Contexts       []string
+	ProjectTags    []string
+	AdditionalTags map[string]string
+}
+
+// ParseProject parses the input text string into a Project struct
+func ParseProject(text string) (*Project, error) {
+	var err error
+	project := Project{
+		AdditionalTags: make(map[string]string),
+	}
+	project.Original = strings.Trim(text, "\t\n\r ")
+	parts := strings.Fields(project.Original)
+	project.Name, parts = parts[0], parts[1:]
+	if parts[1][0] == '^' {
+		project.Directory, parts = parts[0], parts[1:]
+	}
+	for _, v := range parts {
+		switch v[0] {
+		case '@': // Contexts
+			project.Contexts = append(project.Contexts, v[1:])
+		case '+': // ProjectTags
+			project.ProjectTags = append(project.ProjectTags, v[1:])
+		default:
+			if strings.Contains(v, ":") {
+				// Additional Tags
+				tagPts := strings.Split(v, ":")
+				if tagPts[0] != "" && tagPts[1] != "" {
+					project.AdditionalTags[tagPts[0]] = tagPts[1]
+				}
+			}
+		}
+	}
+	return &project, err
+}
+
+// String returns a complete project string in project.txt format.
+//
+// Contexts, ProjectTags, and Additional Tags are alphabetically sorted,
+// and appended at the end in the following order:
+// Contexts, ProjectTags, Tags
+//
+// For example:
+// Project.txt ^/home/user/projects/projecttxt @personal +projectxt contact:"Frank Workman" "Address 1":"1234 Work Place"
+func (project Project) String() string {
+	text := fmt.Sprintf("%s ", project.Name)
+	text += fmt.Sprintf("%s ", project.Directory)
+	if len(project.Contexts) > 0 {
+		sort.Strings(project.Contexts)
+		for _, context := range project.Contexts {
+			text += fmt.Sprintf("@%s ", context)
+		}
+	}
+	if len(project.ProjectTags) > 0 {
+		sort.Strings(project.ProjectTags)
+		for _, pTag := range project.ProjectTags {
+			text += fmt.Sprintf("+%s ", pTag)
+		}
+	}
+	if len(project.AdditionalTags) > 0 {
+		keys := make([]string, 0, len(project.AdditionalTags))
+		for key := range project.AdditionalTags {
+			keys = append(keys, key)
+		}
+		sort.Strings(keys)
+		for _, key := range keys {
+			text += fmt.Sprintf("%s:%s ", key, project.AdditionalTags[key])
+		}
+	}
+	return text
+}
+
+func (project *Project) HasContext(context string) bool {
+	for _, v := range project.Contexts {
+		if v == context {
+			return true
+		}
+	}
+	return false
+}
+
+func (project *Project) HasProjectTag(projectTag string) bool {
+	for _, v := range project.ProjectTags {
+		if v == projectTag {
+			return true
+		}
+	}
+	return false
+}
+
+func (project *Project) SetTag(name, val string) {
+	project.AdditionalTags[name] = val
+}
+
+func (project *Project) HasTag(name string) bool {
+	_, ok := project.AdditionalTags[name]
+	return ok
+}
+
+func (project *Project) GetTag(name string) string {
+	return project.AdditionalTags[name]
+}
diff --git a/projectlist.go b/projectlist.go
new file mode 100644
index 0000000..3d944eb
--- /dev/null
+++ b/projectlist.go
@@ -0,0 +1,213 @@
+package projecttxt
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+type ProjectList []*Project
+
+func NewProjectList() *ProjectList {
+	return &ProjectList{}
+}
+
+func (projectlist *ProjectList) Size() int {
+	return len([]*Project(*projectlist))
+}
+
+func (projectlist *ProjectList) GetProjectSlice() []*Project {
+	return []*Project(*projectlist)
+}
+
+func (projectlist *ProjectList) GetProjectsWithContext(context string) *ProjectList {
+	return projectlist.Filter(func(p *Project) bool {
+		return p.HasContext(context)
+	})
+}
+
+func (projectlist *ProjectList) GetProjectsWithProjectTag(projectTag string) *ProjectList {
+	return projectlist.Filter(func(p *Project) bool {
+		return p.HasProjectTag(projectTag)
+	})
+}
+
+// Filter filters the current TimerList for the given predicate (a function that takes a timer as input and returns a
+// bool), and returns a new ProjectList. The original ProjectList is not modified.
+func (projectlist *ProjectList) Filter(predicate func(*Project) bool) *ProjectList {
+	var newList ProjectList
+	for _, t := range *projectlist {
+		if predicate(t) {
+			newList = append(newList, t)
+		}
+	}
+	return &newList
+}
+
+// AddProject prepends a Project to the current ProjectList and takes care to set the ProjectId correctly
+func (projectlist *ProjectList) AddProject(project *Project) {
+	// The new project will be id 1
+	project.Id = 1
+	// All other projects get their id incremented
+	for _, p := range *projectlist {
+		p.Id++
+	}
+	// Now prepend the project to the slice
+	*projectlist = append(*projectlist, &Project{})
+	copy((*projectlist)[1:], (*projectlist)[0:])
+	(*projectlist)[0] = project
+}
+
+// GetProject returns the Project with the given project 'id' form the ProjectList.
+// Returns an error if Project could not be found.
+func (projectlist *ProjectList) GetProject(id int) (*Project, error) {
+	for i := range *projectlist {
+		if ([]*Project(*projectlist))[i].Id == id {
+			return ([]*Project(*projectlist))[i], nil
+		}
+	}
+	return nil, errors.New("project not found")
+}
+
+// RemoveProjectById removes any Project with given Project 'id' from the ProjectList.
+// Returns an error if no Project was removed.
+func (projectlist *ProjectList) RemoveProjectById(id int) error {
+	var newList ProjectList
+	found := false
+	for _, p := range *projectlist {
+		if p.Id != id {
+			newList = append(newList, p)
+		} else {
+			found = true
+		}
+	}
+	if !found {
+		return errors.New("project not found")
+	}
+	*projectlist = newList
+	return nil
+}
+
+// RemoveProject removes any Project from the ProjectList with the same String representation as the given Project.
+// Returns an error if no Project was removed.
+func (projectlist *ProjectList) RemoveProject(project Project) error {
+	var newList ProjectList
+	found := false
+	for _, p := range *projectlist {
+		if p.String() != project.String() {
+			newList = append(newList, p)
+		} else {
+			found = true
+		}
+	}
+	if !found {
+		return errors.New("project not found")
+	}
+	*projectlist = newList
+	return nil
+}
+
+// ArchiveProjctToFile removes the project from the active list and concatenates it to
+// the passed in filename
+// Return an err if any part of that fails
+func (projectlist *ProjectList) ArchiveProjectToFile(project Project, filename string) error {
+	if err := projectlist.RemoveProject(project); err != nil {
+		return err
+	}
+	f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, 0600)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = f.WriteString(project.String() + "\n")
+	return err
+}
+
+// LoadFromFile loads a ProjectList from *os.File.
+// Note: This will clear the current TimerList and overwrite it's contents with whatever is in *os.File.
+func (projectlist *ProjectList) LoadFromFile(file *os.File) error {
+	*projectlist = []*Project{} // Empty projectlist
+	projectId := 1
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		text := strings.Trim(scanner.Text(), "\t\n\r") // Read Line
+		// Ignore blank lines
+		if text == "" {
+			continue
+		}
+		project, err := ParseProject(text)
+		if err != nil {
+			return err
+		}
+		project.Id = projectId
+		*projectlist = append(*projectlist, project)
+		projectId++
+	}
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// WriteToFile writes a ProjectList to *os.File
+func (projectlist *ProjectList) WriteToFile(file *os.File) error {
+	writer := bufio.NewWriter(file)
+	_, err := writer.WriteString(projectlist.String())
+	writer.Flush()
+	return err
+}
+
+// LoadFromFilename loads a ProjectList from the filename.
+func (projectlist *ProjectList) LoadFromFilename(filename string) error {
+	file, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	return projectlist.LoadFromFile(file)
+}
+
+// WriteToFilename writes a ProjectList to the specified file (most likely called "project.txt").
+func (projectlist *ProjectList) WriteToFilename(filename string) error {
+	return ioutil.WriteFile(filename, []byte(projectlist.String()), 0640)
+}
+
+// String returns a complete list of projects in project.txt format.
+func (projectlist ProjectList) String() string {
+	var ret string
+	for _, project := range projectlist {
+		ret += fmt.Sprintf("%s\n", project.String())
+	}
+	return ret
+}
+
+// LoadFromFile loads and returns a ProjectList from *os.File.
+func LoadFromFile(file *os.File) (ProjectList, error) {
+	projectlist := ProjectList{}
+	if err := projectlist.LoadFromFile(file); err != nil {
+		return nil, err
+	}
+	return projectlist, nil
+}
+
+// WriteToFile writes a ProjectList to *os.File.
+func WriteToFile(projectlist *ProjectList, file *os.File) error {
+	return projectlist.WriteToFile(file)
+}
+
+// LoadFromFilename loads and returns a ProjectList from a file (most likely called "project.txt")
+func LoadFromFilename(filename string) (ProjectList, error) {
+	projectlist := ProjectList{}
+	if err := projectlist.LoadFromFilename(filename); err != nil {
+		return nil, err
+	}
+	return projectlist, nil
+}
+
+// WriteToFilename write a ProjectList to the specified file (most likely called "project.txt")
+func WriteToFilename(projectlist *ProjectList, filename string) error {
+	return projectlist.WriteToFilename(filename)
+}