Previously, channels with characters like '/' would just get replaced
with '-'. This caused soju+gamja to act very weirdly, like showing
two channels instead of one.

Note: This is my first time contributing to a Go project, please
review this carefully. Seems to work fine for me while testing with
chathistorysync and senpai.

Closes: https://todo.sr.ht/~emersion/soju/208
Signed-off-by: Alfred Persson Forsberg <cat@catcream.org>
---
 msgstore/fs.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/msgstore/fs.go b/msgstore/fs.go
index 00f0e00..a6cfa67 100644
--- a/msgstore/fs.go
+++ b/msgstore/fs.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"net/url"
 	"os"
 	"path/filepath"
 	"sort"
@@ -30,7 +31,7 @@ func EscapeFilename(unsafe string) (safe string) {
 	} else if unsafe == ".." {
 		return "--"
 	} else {
-		return strings.NewReplacer("/", "-", "\\", "-").Replace(unsafe)
+		return url.PathEscape(unsafe)
 	}
 }
 
@@ -492,8 +493,12 @@ func (ms *fsMessageStore) ListTargets(ctx context.Context, network *database.Net
 			continue
 		}
 
+		targetName, err := url.PathUnescape(target)
+		if err != nil {
+			return nil, err
+		}
 		targets = append(targets, ChatHistoryTarget{
-			Name:          target,
+			Name:          targetName,
 			LatestMessage: t,
 		})
 
-- 
2.40.0

Probably better to make a separate EscapeFilename function for
channels, and then unescape the channel name for CHATHISTORY like I
currently do.

This will escape the whole path which won't work with for ex.
"/var/lib/#/soju/fs_store".

Will send an update later today.

I've been holding off this patch because it behaves differently than
ZNC, which we inherit the log format from. ZNC escapes with "-" as well.