ves-var-add.sh: Initial version

1 files changed, 83 insertions, 0 deletions

diff --git a/ves-var-add.sh b/ves-var-add.sh
index 1a24852..7f0ee5a 100644..100755
--- a/ves-var-add.sh
+++ b/ves-var-add.sh
@@ -1 +1,84 @@
 #!/bin/sh
+
+if [ -z ${XDG_DATA_HOME+x} ]; then
+    ENV_DIR="$HOME/.local/share/ves/envs"
+else
+    ENV_DIR="$XDG_DATA_HOME/ves/envs"
+fi
+
+check_name() {
+    if ! [ -f "$ENV_DIR/$1" ]; then
+        printf "ERROR: Environment [%s] does not exist.\n" $1 > /dev/stderr
+        exit 1
+    fi
+
+    if ! echo $1 | grep "^[[:alpha:][:digit:]_-]*$" > /dev/null; then
+        printf "ERROR: Environment [%s] is invalid. Name must contain only letters, -, and _\n" $1 > /dev/stderr
+        exit 1
+    fi
+}
+
+ENV=""
+
+while :; do
+    case $1 in
+        --env=*)
+            ENV=$( echo $1 | cut -d "=" -f 2 )
+            shift
+            break
+            ;;
+        --)
+            shift
+            break
+            ;;
+
+        -?*)
+            printf "ERROR: Invalid option [%s]\n" $1 > /dev/stderr
+            exit 2
+            ;;
+
+        *)
+            break
+    esac
+    shift
+done
+
+if ! [ -z $ENV ]; then
+    check_name $ENV
+elif ! [ -z $VES_ENV_NM ]; then
+    # this check_name shouldn't be necessary, but I suppose someone
+    # could always manually reassign the variable, so we'd better
+    # check it.
+    check_name $VES_ENV_NM
+    ENV=$VES_ENV_NM
+else
+    printf "ERROR: No valid environment active or specified\n" > /dev/stderr
+    exit 2
+fi
+
+if [ $# -lt 2 ]; then
+    printf "ERROR: Insufficient arguments provided.\n"
+    exit 2
+fi
+
+# Ah, bash would have made this so much nicer... alas
+# if [ -z ${!1+x} ]; then ...
+if eval [ -z \${$1+x} ]; then
+    printf "ERROR: Specified variable [%s] does not exist in environment.\n" $1 > /dev/stderr
+    printf "\tYou can create it with\n\t ves export %s\n " $1 > /dev/stderr
+    exit 2
+fi
+
+# If we get down here, all is good. We can go ahead and prepend
+# :$2 to the variable contained in $1. Again, no easy indirection,
+# so we must use eval.
+if eval [ -z \${$1} ]; then
+  export $1=$2
+else
+    eval export "$1"="$2":\$"$1"
+fi
+
+# Perhaps we could use . to run this script from the main caller
+# which could be set up as a shell function?
+# That approach seems to work to modify the parent shell. Just
+# gotta set up the main guy as a function.