Add install script for bat

bat/.local/bin/install-bat-home

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+
+APP=bat
+VERSION=${VERSION:-v0.17.1}
+DATA_DIR="${XDG_DATA_HOME}/apps/releases"
+DEST_DIR="${DATA_DIR}/${APP}/${VERSION}"
+
+OS=
+ARCH=
+case $(uname -s) in
+    Linux*)                 OS=unknown-linux-gnu;;
+    Darwin*)                OS=apple-darwin;;
+    CYGWIN_NT*|Windows_NT*) OS=pc-windows-msvc;;
+    *) >&2 echo "unsupported os"; return;
+esac
+
+case $(uname -m) in
+    amd64*|x86_64*)     ARCH=x86_64;;
+    i686*|i386*)        ARCH=i686;;
+    arm|armv7*|armv6*)  ARCH=arm;;
+    aarch64*|armv8*)    ARCH=arm64;;
+    *) >&2 echo "unsupported architecture: $(uname -m)"; exit 1;;
+esac
+
+function bail () {
+    echo "unexpected error $1"
+    exit 1
+}
+
+function do_link () {
+    local dir="$1"
+    local link="$2"
+    if [[ ! -d "${dir}" ]] ; then
+        return
+    fi
+    if [[ -L "${dir}/$(basename "${link}")" ]] ; then
+        return
+    fi
+    cd "${dir}" || bail "failed to change directory: ${dir}"
+    ln --symbolic "${link}" "$(basename "${link}")"
+}
+
+URL="https://github.com/sharkdp/bat/releases/download/${VERSION}/bat-${VERSION}-${ARCH}-${OS}.tar.gz"
+TMP_DIR=
+if [[ ! -d "${DEST_DIR}" ]] ; then
+    set -x
+    TMP_DIR=$(mktemp --directory)
+    TAR_GZ="${TMP_DIR}/release.tar.gz"
+    echo "start download: ${URL}"
+    curl --location --silent --output "${TAR_GZ}" "${URL}"
+    echo "stop download: ${URL}"
+    mkdir -p "${DEST_DIR}"
+    tar xzf "${TAR_GZ}" --strip-components 1 --directory "${DEST_DIR}"
+    rm -rf "${TMP_DIR}"
+fi
+unset TMP_DIR
+
+cd "${DATA_DIR}/${APP}" || bail "directory change failed: ${DATA_DIR}/${APP}"
+[[ -s current ]] && unlink current
+ln -s "${VERSION}" current
+
+ZSH_CONFIG_D="${XDG_CONFIG_HOME}/zsh/zshrc.d"
+FISH_CONFIG_D="${XDG_CONFIG_HOME}/fish/functions"
+MAN_DIR="${XDG_DATA_HOME}/man/man1"
+[[ -d ${MAN_DIR} ]] || mkdir -p "${MAN_DIR}"
+
+do_link "${XDG_BIN_HOME}" "${DATA_DIR}/${APP}/current/bat"
+do_link "${ZSH_CONFIG_D}" "${DATA_DIR}/${APP}/current/autocomplete/bat.zsh"
+do_link "${FISH_CONFIG_D}" "${DATA_DIR}/${APP}/current/autocomplete/bat.fish"
+do_link "${MAN_DIR}" "${DATA_DIR}/${APP}/current/bat.1"