From c61a6995a220b9b105ace10c134ccead7a080a19 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mickae=CC=88l=20Menu?= <mickael.menu@gmail.com>
Date: Tue, 19 Jan 2021 19:59:03 +0100
Subject: [PATCH] Proof of concept for filtering notes interactively with fzf

---
 core/note/filter.go | 70 +++++++++++++++++++++++++++++++++++++++++++++
 core/note/list.go   |  4 +--
 2 files changed, 72 insertions(+), 2 deletions(-)
 create mode 100644 core/note/filter.go

diff --git a/core/note/filter.go b/core/note/filter.go
new file mode 100644
index 0000000..283a516
--- /dev/null
+++ b/core/note/filter.go
@@ -0,0 +1,70 @@
+package note
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+
+	"github.com/mickael-menu/zk/adapter/tty"
+	"github.com/mickael-menu/zk/core/style"
+	"github.com/mickael-menu/zk/util/strings"
+)
+
+func WithMatchFilter(callback func(func(Match) error)) ([]string, error) {
+	styler := tty.NewStyler()
+
+	return withFilter(func(w io.Writer) {
+		callback(func(m Match) error {
+			fmt.Fprintf(w, "%v\x01  %v  %v\n",
+				m.Path,
+				styler.MustStyle(m.Title, style.Rule("yellow")),
+				styler.MustStyle(strings.JoinLines(m.Body), style.Rule("black")),
+			)
+			return nil
+		})
+	})
+}
+
+func withFilter(callback func(w io.Writer)) ([]string, error) {
+	zkBin, err := os.Executable()
+	if err != nil {
+		return []string{}, err
+	}
+
+	cmd := exec.Command(
+		"fzf",
+		"--delimiter", "\x01",
+		"--tiebreak", "begin",
+		"--ansi",
+		"--exact",
+		"--height", "100%",
+		// FIXME: Use it to create a new note? Like notational velocity
+		// "--print-query",
+		// Make sure the path and titles are always visible
+		"--no-hscroll",
+		"--tabstop", "4",
+		// Don't highlight search terms
+		"--color", "hl:-1,hl+:-1",
+		// "--preview", `bat -p --theme Nord --color always {1}`,
+		"--preview", zkBin+" list -f {{raw-content}} {1}",
+		"--preview-window", "noborder:wrap",
+	)
+	cmd.Stderr = os.Stderr
+
+	w, err := cmd.StdinPipe()
+	if err != nil {
+		return []string{}, err
+	}
+	go func() {
+		callback(w)
+		w.Close()
+	}()
+
+	output, err := cmd.Output()
+	if err != nil {
+		return []string{}, err
+	}
+
+	return strings.SplitLines(string(output)), nil
+}
diff --git a/core/note/list.go b/core/note/list.go
index 5e4c923..53ff6b2 100644
--- a/core/note/list.go
+++ b/core/note/list.go
@@ -130,8 +130,8 @@ type matchRenderContext struct {
 	Title      string
 	Lead       string
 	Body       string
-	RawContent string
-	WordCount  int
+	RawContent string `handlebars:"raw-content"`
+	WordCount  int    `handlebars:"word-count"`
 	Snippet    string
 	Created    time.Time
 	Modified   time.Time