add vim-mouse

diff --git a/vim-mouse/README.md b/vim-mouse/README.md
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+++ b/vim-mouse/README.md
@@ -0,0 +1,43 @@
+---
+title: vim-mouse
+homepage: https://webinstall.dev/vim-mouse
+tagline: |
+  vim mouse is Vim's built-in mouse support
+---
+
+To update (replacing the current version) run `webi vim-mouse`.
+
+## Cheat Sheet
+
+Vim has built-in mouse support.
+
+It is turned off by default and when turned on may not behave exactly as
+expected.
+
+This vim-mouse plugin turns on mouse support with insert mode on click,
+select-to-copy clipboard, and other GUI options.
+
+### How to configure manually
+
+Create the file `~/.vim/plugins/mouse.vim`. Add the same contents as
+<https://github.com/webinstall/webi-installers/blob/master/vim-mouse/mouse.vim>.
+
+That will look something like this:
+
+```vim
+" turn on mouse support
+set mouse=a
+
+" keep copy-on-select and other GUI options
+set clipboard+=autoselect guioptions+=a
+
+" enter insert mode on left-click
+nnoremap <LeftMouse> <LeftMouse>i
+```
+
+You'll then need to update `~/.vimrc` to source that plugin:
+
+```vim
+" Mouse Support: reasonable defaults from webinstall.dev/vim-mouse
+source ~/.vim/plugins/mouse.vim
+```

diff --git a/vim-mouse/install.sh b/vim-mouse/install.sh
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+++ b/vim-mouse/install.sh
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+#!/bin/bash
+
+function __init_vim_mouse() {
+    set -e
+    set -u
+
+    mkdir -p "$HOME/.vim/plugins"
+    rm -rf "$HOME/.vim/plugins/mouse.vim"
+
+    echo ""
+
+    if [ ! -e "$HOME/.vimrc" ]; then
+        touch "$HOME/.vimrc"
+    fi
+
+    if ! [ -f "$HOME/.vim/plugins/mouse.vim" ]; then
+        mkdir -p ~/.vim/plugins
+        WEBI_HOST=${WEBI_HOST:-"https://webinstall.dev"}
+        curl -fsS -o ~/.vim/plugins/mouse.vim "$WEBI_HOST/packages/vim-mouse/mouse.vim"
+    fi
+
+    if ! grep 'source.*plugins.mouse.vim' -r ~/.vimrc > /dev/null 2> /dev/null; then
+        set +e
+        mkdir -p ~/.vim/plugins
+        printf '\n" Mouse Support: reasonable defaults from webinstall.dev/vim-mouse\n' >> ~/.vimrc
+        printf 'source ~/.vim/plugins/mouse.vim\n' >> ~/.vimrc
+        set -e
+        echo "added ~/.vim/plugins/mouse.vim"
+        echo "updated ~/.vimrc with 'source ~/.vim/plugins/mouse.vim'"
+        echo ""
+    fi
+
+    echo "vim-mouse enabled with reasonable defaults"
+}
+
+__init_vim_mouse

diff --git a/vim-mouse/mouse.vim b/vim-mouse/mouse.vim
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index 0000000..761cf57
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+++ b/vim-mouse/mouse.vim
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+" turn on mouse support
+set mouse=a
+
+" keep copy-on-select and other GUI options
+set clipboard+=autoselect guioptions+=a
+
+" enter insert mode on left-click
+nnoremap <LeftMouse> <LeftMouse>i