Add vim-yubisigner wrapper and installation instructions

- Add scripts/vim-yubisigner (editor wrapper for YubiKey signing)
- Update README with complete installation steps for yubisigner-cli
- Include code blocks for building and installing wrapper

2 files changed, 79 insertions, 4 deletions

diff --git a/README.md b/README.md
index 333166f..7a28025 100644
--- a/README.md
+++ b/README.md
@@ -42,10 +42,20 @@ apt install neomutt tor torsocks swaks
 
 For automatic post signing with YubiKey PIV Ed25519:
 
-1. Install [yubisigner](https://github.com/Ch1ffr3punk/yubisigner) dependencies (Go, piv-go, etc.)
-2. Build [yubisigner-cli](https://git.virebent.art/virebent/yubisigner-cli) (CLI version of yubisigner GUI)
-3. Configure YubiKey PIV slot 9c with Ed25519 key
-4. Install `vim-yubisigner` wrapper script
+1. Configure YubiKey PIV slot 9c with Ed25519 key (one-time setup)
+2. Install [yubisigner-cli](https://git.virebent.art/virebent/yubisigner-cli):
+   ```bash
+   cd ~/bin
+   git clone https://git.virebent.art/virebent/yubisigner-cli
+   cd yubisigner-cli
+   go build -o yubisigner-cli main.go
+   ```
+3. Install `vim-yubisigner` wrapper from this repo:
+   ```bash
+   mkdir -p ~/bin
+   cp scripts/vim-yubisigner ~/bin/vim-yubisigner
+   chmod +x ~/bin/vim-yubisigner
+   ```
 
 The mail2news account is pre-configured to use `vim-yubisigner` as editor, which automatically signs messages with YubiKey after editing.
 
diff --git a/scripts/vim-yubisigner b/scripts/vim-yubisigner
new file mode 100755
index 0000000..45d1c3d
--- /dev/null
+++ b/scripts/vim-yubisigner
@@ -0,0 +1,65 @@
+#!/bin/bash
+# Vim wrapper that auto-signs with yubisigner-cli after editing
+# Used by NeoMutt mail2news account
+# Creates PGP-like clearsign format with yubisigner signature
+
+set -euo pipefail
+
+# First argument is the file to edit
+FILE="$1"
+
+# Open vim for editing
+vim "$FILE"
+
+# Save original message
+ORIGINAL_MSG=$(cat "$FILE")
+
+# After vim exits, sign the message
+echo ""
+echo "Signing message with YubiKey..."
+
+# Kill gpg-agent to release YubiKey (it will auto-restart later)
+echo "Releasing YubiKey from gpg-agent..."
+gpgconf --kill gpg-agent 2>/dev/null || true
+sleep 1
+
+# Sign with yubisigner-cli (PIN will be prompted)
+if ! "$HOME/bin/yubisigner-cli/yubisigner-cli" \
+  --input "$FILE" \
+  --author "Gab Virebent" \
+  --email "gabriel1@virebent.art" \
+  --url "https://contact.virebent.art" \
+  --comment "Posted via NeoMutt mail2news"; then
+  echo ""
+  echo "ERROR: yubisigner-cli failed!"
+  echo "Press ENTER to continue WITHOUT signature..."
+  read
+  exit 0
+fi
+
+# Check if signature was created
+if [ ! -f "$FILE.sig" ]; then
+  echo ""
+  echo "ERROR: Signature file not created!"
+  echo "Press ENTER to continue WITHOUT signature..."
+  read
+  exit 0
+fi
+
+# Create clearsign format (like PGP clearsign but with yubisigner signature)
+{
+  echo "-----BEGIN YUBISIGNER SIGNED MESSAGE-----"
+  echo "Hash: SHA256"
+  echo ""
+  echo "$ORIGINAL_MSG"
+  echo ""
+  cat "$FILE.sig"
+} > "$FILE.tmp"
+
+# Replace original file with clearsign version
+mv "$FILE.tmp" "$FILE"
+
+# Cleanup
+rm -f "$FILE.sig"
+
+echo "Message signed successfully"