add vim-airline-themes installer

vim-airline-themes/README.md

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+---
+title: vim-airline-themes
+homepage: https://github.com/vim-airline/vim-airline-themes
+tagline: |
+  The official theme repository for vim-airline
+---
+
+## Cheat Sheet
+
+> The official themes for vim-airline.
+
+This installer adds the theme selection to `~/.vim/plugins/airline.vim` which is
+created by the vim-airline installer.
+
+```
+let g:airline_theme='simple'
+```
+
+See the [docs](https://github.com/vim-airline/vim-airline-themes) for a list of
+available themes.

vim-airline-themes/airline.vim

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+let g:airline_theme='simple'

vim-airline-themes/install.ps1

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+#!/usr/bin/env pwsh
+
+IF (!(Test-Path -Path "$Env:USERPROFILE\.vim\pack\plugins\start")) {
+    New-Item -Path "$Env:USERPROFILE\.vim\pack\plugins\start" -ItemType Directory -Force | out-null
+}
+Remove-Item -Path "$Env:USERPROFILE\.vim\pack\plugins\start\vim-airline-themes" -Recurse -ErrorAction Ignore
+& git clone --depth=1 https://github.com/vim-airline/vim-airline-themes.git "$Env:USERPROFILE\.vim\pack\plugins\start\vim-airline-themes"

vim-airline-themes/install.sh

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+#!/bin/sh
+
+__init_vim_airline_themes() {
+    set -e
+    set -u
+
+    mkdir -p "$HOME/.vim/pack/plugins/start"
+    rm -rf "$HOME/.vim/pack/plugins/start/vim-airline-themes"
+    git clone --depth=1 https://github.com/vim-airline/vim-airline-themes.git "$HOME/.vim/pack/plugins/start/vim-airline-themes"
+
+    if [ ! -f "$HOME/.vimrc" ]; then
+        touch "$HOME/.vimrc"
+    fi
+
+    mkdir -p ~/.vim/plugins
+    if [ -f "$HOME/.vim/plugins/airline.vim" ]; then
+        WEBI_HOST=${WEBI_HOST:-"https://webinstall.dev"}
+        if ! grep -qF "let g:airline_theme=" $HOME/.vim/plugins/airline.vim; then
+            echo ""
+            echo "set theme 'simple' as default, update in $HOME/.vim/plugins/airline.vim"
+            curl -s "$WEBI_HOST/packages/vim-airline-themes/airline.vim" >> $HOME/.vim/plugins/airline.vim
+        fi
+    else
+        curl -fsSL -o ~/.vim/plugins/airline.vim "$WEBI_HOST/packages/vim-airline-themes/airline.vim"
+    fi
+
+    if ! grep 'source.*plugins.airline.vim' -r ~/.vimrc > /dev/null 2> /dev/null; then
+        set +e
+        mkdir -p ~/.vim/plugins
+        printf '\n" vim-airline-themes: reasonable defaults from webinstall.dev/vim-airline-themes\n' >> ~/.vimrc
+        printf 'source ~/.vim/plugins/airline.vim\n' >> ~/.vimrc
+        set -e
+        echo ""
+        echo "add ~/.vim/plugins/airline.vim"
+        echo "updated ~/.vimrc with 'source ~/.vim/plugins/airline.vim'"
+    fi
+
+    echo ""
+    echo "vim-airline-themes enabled with reasonable defaults"
+}
+
+__init_vim_airline_themes