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model.go
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model.go
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package main
import (
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"strings"
"github.com/charmbracelet/bubbles/list"
"github.com/charmbracelet/bubbles/textinput"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
)
type scene int
const (
scenePrSelect = iota
sceneTypeSelect
sceneBodyInput
)
type model struct {
scene scene
list list.Model
body textinput.Model
targetPR string
targetType string
fileName string
written bool
errMsg string
}
func newModel() model {
ti := textinput.New()
ti.Focus()
ti.Prompt = ""
return model{
list: list.New([]list.Item{}, list.NewDefaultDelegate(), 0, len(releaseNoteTypes)),
body: ti,
}
}
func (m model) Init() tea.Cmd {
return func() tea.Msg {
// early exit if we're not at top-level directory
if _, err := os.ReadDir(".changelog"); err != nil {
return errors.New(".changelog directory not found. Are you in the project root?")
}
// -X=GET required since passing -F defaults the request to POST
cmd := exec.Command("gh", "api", "-X=GET", "search/issues",
"-F", "q=repo:{owner}/{repo} is:open type:pr head:{branch}",
"-q", ".items.[].number", // jq filtering
)
raw, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("gh error: %s: %v", bytes.TrimSpace(raw), err.Error())
}
if len(raw) == 0 {
return errors.New("no open pull requests found for current branch")
}
prs := strings.Split(strings.TrimSpace(string(raw)), "\n")
// Fast path since most branches will have at most one open PR.
if len(prs) == 1 {
return prs[0]
}
prListItems := make([]list.Item, len(prs))
for i, pr := range prs {
prListItems[i] = item(pr)
}
l := list.New(prListItems, itemDelegate{}, 30, len(prListItems))
l.Title = "Select PR number:"
l.SetShowPagination(false)
l.SetShowStatusBar(false)
l.SetFilteringEnabled(false)
l.SetShowHelp(false)
l.Styles.Title = lipgloss.NewStyle()
return l
}
}
func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
switch msg := msg.(type) {
case tea.WindowSizeMsg:
// We don't dynamically update size after init
return m, nil
case error:
m.errMsg = msg.Error()
return m, tea.Quit
case string: // single PR found
m.targetPR = msg
case list.Model: // multiple PRs found
m.list = msg
return m, nil
case tea.KeyMsg:
switch msg.String() {
case "ctrl+c":
m.errMsg = "terminated"
return m, tea.Quit
case "enter":
switch m.scene {
case scenePrSelect:
if i, ok := m.list.SelectedItem().(item); ok {
m.targetPR = string(i)
}
case sceneTypeSelect:
if i, ok := m.list.SelectedItem().(item); ok {
m.targetType = string(i)
}
case sceneBodyInput:
var bb bytes.Buffer
bb.WriteString(header + m.targetType + "\n")
bb.WriteString(m.body.Value() + "\n")
bb.WriteString(footer + "\n")
if err := os.WriteFile(m.fileName, bb.Bytes(), 0644); err != nil {
m.errMsg = err.Error()
return m, tea.Quit
}
m.written = true
return m, tea.Quit
}
}
}
// If targetPR is set, prompt for changelog type
if m.scene < sceneTypeSelect && m.targetPR != "" && len(m.list.Items()) == 0 {
m.fileName = fmt.Sprintf(".changelog/%s.txt", m.targetPR)
if _, err := os.ReadFile(m.fileName); err == nil {
m.errMsg = m.fileName + " already exists\n"
return m, tea.Quit
}
m.scene = sceneTypeSelect
l := list.New(releaseNoteTypes, itemDelegate{}, 30, len(releaseNoteTypes)+3)
l.Title = "Select a changelog type:"
l.Styles.Title = lipgloss.NewStyle()
l.SetShowPagination(false)
l.SetShowStatusBar(false)
l.SetFilteringEnabled(false)
l.SetShowHelp(false)
m.list = l
return m, nil
}
// if targetType is set, prompt for body
if m.scene < sceneBodyInput && m.targetType != "" {
m.scene = sceneBodyInput
m.list.SetItems(nil)
return m, nil
}
// handle key presses for subcomponents
var cmd tea.Cmd
if m.scene == sceneTypeSelect || m.scene == scenePrSelect {
m.list, cmd = m.list.Update(msg)
}
if m.scene == sceneBodyInput {
m.body, cmd = m.body.Update(msg)
}
return m, cmd
}
func (m model) View() string {
var sb strings.Builder
if m.targetPR != "" {
sb.WriteString(lipgloss.NewStyle().Bold(true).
Render(".changelog/"+m.targetPR+".txt") + "\n")
}
if m.targetType != "" {
sb.WriteString(lipgloss.NewStyle().Italic(true).
Render(header+m.targetType) + "\n")
}
if len(m.list.Items()) > 0 {
sb.WriteString(m.list.View())
}
if m.scene == sceneBodyInput {
if m.written {
sb.WriteString(m.body.Value() + "\n")
sb.WriteString(footer + "\n")
} else {
sb.WriteString(m.body.View() + "\n")
sb.WriteString(footer + "\n")
sb.WriteString("\n")
sb.WriteString(lipgloss.NewStyle().Render("(enter to save or ctrl+c to exit)\n"))
}
}
if m.written {
sb.WriteString("File written.\n")
}
if m.errMsg != "" {
sb.WriteString(m.errMsg + "\n")
}
if sb.Len() > 0 {
return sb.String()
}
return "Querying GitHub API. This may take a few seconds..."
}