From 373caa4776d2111a823b2cf4f2b7f79bc5e1c66c Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Fri, 14 Sep 2018 14:47:05 +0800
Subject: Add scripts/heasoft.sh to help avoid library conflicts

---
 README.md          | 51 ++++++++++++++++++++++++++++++++++++++++
 scripts/heasoft.sh | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 119 insertions(+)
 create mode 100755 scripts/heasoft.sh

diff --git a/README.md b/README.md
index 26740e3..88c97fb 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,7 @@ Installation
    $ make install
    ```
 
+
 Settings
 --------
 Add the following settings to your shell's initialization file
@@ -90,6 +91,56 @@ alias calclxfx="${CHANDRA_ACIS_BIN}/calc_lxfx_wrapper.sh"
 alias getlxfx="${CHANDRA_ACIS_BIN}/get_lxfx_data.sh"
 ```
 
+HEASoft Setup
+-------------
+To avoid the conflicts between HEASoft and system libraries,
+a [wrapper script](scripts/heasoft.sh) is provided.
+
+```sh
+$ mkdir ~/.heasoft
+$ cp scripts/heasoft.sh ~/.heasoft
+
+# Assume that your HEASoft is installed at '~/local/heasoft/heasoft-x.xx/'
+$ cd ~/local/heasoft
+$ ln -s heasoft-x.xx default
+$ cd default
+$ ln -s x86_64-unknown-linux-gnu-libc* PORTAL
+```
+
+Then add the following `heainit()` shell function:
+```sh
+heainit() {
+    local ld_lib_bak i tool
+    local wrapper="${HOME}/.heasoft/heasoft.sh"
+    local wrapper_dir=$(dirname ${wrapper})
+    local wrapper_name=$(basename ${wrapper})
+    if [ -z "${HEADAS}" ]; then
+        ld_lib_bak=${LD_LIBRARY_PATH}
+        export HEADAS="${HOME}/local/heasoft/default/PORTAL"
+        source ${HEADAS}/headas-init.sh
+        export LD_LIBRARY_PATH=${ld_lib_bak}
+        export PATH="${wrapper_dir}:${PATH}"
+
+        if [ ! -f "${wrapper}" ]; then
+            echo "ERROR: wrapper '${wrapper}' not found!"
+            return
+        fi
+        chmod u=rwx ${wrapper}
+
+        echo "Initializing HEASoft from ${HEADAS} ..."
+        for i in ${HEADAS}/bin/*; do
+            tool=$(basename $i)
+            ln -sf ${wrapper_name} ${wrapper_dir}/${tool}
+        done
+        rehash
+
+        echo "HEASoft initialized."
+    else
+        echo "HEASoft already initialized from: ${HEADAS}"
+    fi
+}
+```
+
 
 Usage
 -----
diff --git a/scripts/heasoft.sh b/scripts/heasoft.sh
new file mode 100755
index 0000000..54e295b
--- /dev/null
+++ b/scripts/heasoft.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+#
+# A wrapper script for the HEASoft tools, to avoid the annoying
+# conflicts between system libraries and the HEASoft bundled
+# libraries due to the '$LD_LIBRARY_PATH' settings.
+#
+# This wrapper is inspired by CIAO.
+#
+# Weitian LI <liweitianux@live.com>
+# Created: 2013-05-18
+# Updated: 2018-05-16
+#
+#
+# Setup:
+# ------------------------------------------------------------------------
+# 1. Copy this wrapper to '~/.heasoft/heasoft.sh'.
+# 2. Add the following shell function to your shell config file.
+#    NOTE: edit 'HEADAS' to match your case.
+#
+# Shell configuration:
+# ------------------------------------------------------------------------
+# heainit() {
+#     local ld_lib_bak i tool
+#     local wrapper="${HOME}/.heasoft/heasoft.sh"
+#     local wrapper_dir=$(dirname ${wrapper})
+#     local wrapper_name=$(basename ${wrapper})
+#     if [ -z "${HEADAS}" ]; then
+#         ld_lib_bak=${LD_LIBRARY_PATH}
+#         export HEADAS="${HOME}/local/heasoft/default/PORTAL"
+#         source ${HEADAS}/headas-init.sh
+#         export LD_LIBRARY_PATH=${ld_lib_bak}
+#         export PATH="${wrapper_dir}:${PATH}"
+#
+#         if [ ! -f "${wrapper}" ]; then
+#             echo "ERROR: wrapper '${wrapper}' not found!"
+#             return
+#         fi
+#         chmod u=rwx ${wrapper}
+#
+#         echo "Initializing HEASoft from ${HEADAS} ..."
+#         for i in ${HEADAS}/bin/*; do
+#             tool=$(basename $i)
+#             ln -sf ${wrapper_name} ${wrapper_dir}/${tool}
+#         done
+#         rehash
+#
+#         echo "HEASoft initialized."
+#     else
+#         echo "HEASoft already initialized from: ${HEADAS}"
+#     fi
+# }
+# ------------------------------------------------------------------------
+
+TOOL="${0##*/}"
+BIN_PATH="${HEADAS}/bin"
+LD_LIBRARY_PATH="${HEADAS}/lib"
+
+if [ -z "${HEADAS}" ]; then
+    echo "ERROR: environment variable 'HEADAS' not set!" >&2
+    exit 1
+elif [ -x "${BIN_PATH}/${TOOL}" ]; then
+    export LD_LIBRARY_PATH
+    exec ${BIN_PATH}/${TOOL} "$@"
+else
+    echo "ERROR: tool '${TOOL}' not found in ${BIN_PATH}!" >&2
+    exit 2
+fi
+
-- 
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