From 23131981b029bb6e332975c22caaa467affab216 Mon Sep 17 00:00:00 2001
From: Hubert Hirtz <hubert@hirtz.pm>
Date: Fri, 13 Nov 2020 12:00:22 +0100
Subject: /topic completion

---
 completions.go | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 completions.go

(limited to 'completions.go')

diff --git a/completions.go b/completions.go
new file mode 100644
index 0000000..6fac5e8
--- /dev/null
+++ b/completions.go
@@ -0,0 +1,73 @@
+package senpai
+
+import (
+	"strings"
+
+	"git.sr.ht/~taiite/senpai/ui"
+)
+
+func (app *App) completionsChannelMembers(cs []ui.Completion, cursorIdx int, text []rune) []ui.Completion {
+	var start int
+	for start = cursorIdx - 1; 0 <= start; start-- {
+		if text[start] == ' ' {
+			break
+		}
+	}
+	start++
+	word := text[start:cursorIdx]
+	if len(word) == 0 {
+		return cs
+	}
+	wordCf := app.s.Casemap(string(word))
+	for _, name := range app.s.Names(app.win.CurrentBuffer()) {
+		if strings.HasPrefix(app.s.Casemap(name.Name.Name), wordCf) {
+			nickComp := []rune(name.Name.Name)
+			if start == 0 {
+				nickComp = append(nickComp, ':')
+			}
+			nickComp = append(nickComp, ' ')
+			c := make([]rune, len(text)+len(nickComp)-len(word))
+			copy(c[:start], text[:start])
+			if cursorIdx < len(text) {
+				copy(c[start+len(nickComp):], text[cursorIdx:])
+			}
+			copy(c[start:], nickComp)
+			cs = append(cs, ui.Completion{
+				Text:      c,
+				CursorIdx: start + len(nickComp),
+			})
+		}
+	}
+	return cs
+}
+
+func (app *App) completionsChannelTopic(cs []ui.Completion, cursorIdx int, text []rune) []ui.Completion {
+	if !hasPrefix(text, []rune("/topic ")) {
+		return cs
+	}
+	topic, _, _ := app.s.Topic(app.win.CurrentBuffer())
+	if cursorIdx == len(text) {
+		compText := append(text, []rune(topic)...)
+		cs = append(cs, ui.Completion{
+			Text:      compText,
+			CursorIdx: len(compText),
+		})
+	}
+	return cs
+}
+
+func hasPrefix(s, prefix []rune) bool {
+	return len(prefix) <= len(s) && equal(prefix, s[:len(prefix)])
+}
+
+func equal(a, b []rune) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := 0; i < len(a); i++ {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}
-- 
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