Say hello to astrohelp, your friendly helper for all your astronautical needs.

astronaut/astrohelp

@@ -0,0 +1,53 @@
+#!/bin/sh -e
+# Helper functions for programs that work with satellite files.
+
+show_help() {
+echo "Script with helper functions for working with satellite files.
+Usage: $0 <satellite file> <function> [arguments]
+
+Functions:
+variable <name>     | Get variable set in the header
+downloads           | Get all download urls"
+}
+
+if [ $# -lt 2 ]; then
+    show_help
+    exit 1
+fi
+
+satellite="$(realpath "$1")"
+function="$2"
+
+if [ "$function" = "variable" ]; then
+    name="$3"
+    if [ ! "$name" ]; then
+        show_help
+        exit 1
+    fi
+
+    printf '
+        header_end() {
+            variable="$%s"
+            [ "$variable" ] && echo "$variable"
+            exit $?
+        }
+        . %s
+    ' "$name" "$satellite" | PATH= /bin/sh 2> /dev/null
+elif [ "$function" = "downloads" ]; then
+    printf '
+        download() {
+            [ "$1" ] && echo "$1"
+        }
+        dlextract() {
+            [ "$1" ] && echo "$1"
+        }
+        dlfile() {
+            [ "$1" ] && echo "$1"
+        }
+        header_end() { exit 0; }
+        . %s
+    ' "$satellite" | PATH= /bin/sh 2> /dev/null
+else
+    show_help
+    exit 1
+fi