1 files changed, 121 insertions, 0 deletions
diff --git a/src/get.sh b/src/get.sh
new file mode 100755
index 0000000..3e0be79
--- /dev/null
+++ b/src/get.sh
@@ -0,0 +1,121 @@
+#!/bin/sh
+
+
+# list all direct dependencies of a package
+#
+list_deps() {
+    local name=$1
+    local tree_file="${DEP_DIR}/$name"
+    [ -f $tree_file ] &&
+        for dep in $(cat "$tree_file"); do
+            echo $dep
+        done | sort -u
+}
+
+# list all dependencies and sub dependencies of a package
+#
+resolve_deps () {
+    local deps=()
+    local to_check=($@)
+    if ${RESOLVE_DEPS}; then
+        while [ "${#to_check[@]}" != "0" ]; do
+            local package=${to_check[-1]}
+            unset to_check[-1]
+
+            deps+=($package)
+            for dep in $(list_deps $package); do
+                # if not already checked
+                if echo ${deps[*]} | grep -qv "\b$dep\b"; then
+                    to_check+=($dep)
+                fi
+            done
+        done
+        echo ${deps[@]}
+    else
+        echo $@
+    fi
+
+}
+
+get_package_download_info() {
+    tail -1 ${PACKAGES_DIR}/*/$1
+}
+
+get_available_version () {
+    echo "${info[1]}"
+}
+
+is_installed() {
+    [ -f "${INSTALLED_DIR}/$1/checksum" ]
+}
+
+get_installed_version () {
+    local name=$1
+    local file="${INSTALLED_DIR}/$name/checksum"
+    [ -f $file ] &&
+        cat $file
+}
+
+# bad implementation
+exists () {
+    [ "$(find ${PACKAGES_DIR} -mindepth 2 -name "$1" | wc -l)" != "0" ]
+}
+
+download () {
+    local requested=($@)
+
+    local missing=()
+    local install=()
+    local update=()
+    local urls=()
+
+    local total_download=0
+
+    for package in $(resolve_deps $@); do
+        if exists $package; then
+            info=($(get_package_download_info $package))
+            url=${info[0]}
+            checksum=${info[1]}
+            size=${info[2]}
+            files=${info[3]}
+            
+            if is_installed $package; then
+                if [ "$(get_installed_version $package)" != "$(get_available_version $package)" ]; then
+                    update+=($package)
+                    total_download=$((total_download+size))
+                fi
+            else
+                install+=($package)
+                total_download=$((total_download+size))
+            fi
+        else
+            missing+=($package)
+        fi
+    done
+
+    if [ "${#missing[@]}" != "0" ]; then
+        printf "${LIGHT_RED}The following packages could not be located:"
+        for package in ${missing[*]}; do
+            printf "${RED} $package"
+        done
+        printf "${RESET}\n"
+    fi
+    if [ "${#update[@]}" != "0" ]; then
+        printf "${LIGHT_GREEN}The following packages will be updated:\n\t"
+        for package in ${update[*]}; do
+            printf "${GREEN} $package"
+        done
+        printf "${RESET}\n"
+    fi
+    if [ "${#install[@]}" != "0" ]; then
+        printf "${LIGHT_BLUE}The following packages will be updated:\n\t"
+        for package in ${install[*]}; do
+            printf "${BLUE} $package"
+        done
+        printf "${RESET}\n"
+    fi
+
+    echo "total download size: ${total_download} bytes"
+}
+
+