diff --git a/private_dot_config/env/run_after_all.sh b/private_dot_config/env/run_after_all.sh
new file mode 100644
index 0000000..62a28f5
--- /dev/null
+++ b/private_dot_config/env/run_after_all.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+update_env
diff --git a/private_dot_config/env b/private_dot_config/env/xdg.env
similarity index 87%
rename from private_dot_config/env
rename to private_dot_config/env/xdg.env
index c643967..ffdf39c 100644
--- a/private_dot_config/env
+++ b/private_dot_config/env/xdg.env
@@ -17,11 +17,8 @@ export ANSIBLE_GALAXY_CACHE_DIR="$XDG_CACHE_HOME/ansible/galaxy_cache"
 #NOTE: for the tmp dir on remotes sould be configuard in ansible.cfg
 
 # fix rust dirs
-export RUSTUP_HOME="$HOME/.local/rust/rustup"
-export CARGO_HOME="$HOME/.local/rust/cargo"
-
 # fix discord dirs
-# export DISCORD_USER_DATA_DIR="$XDG_DATA_HOME"
+export DISCORD_USER_DATA_DIR="$XDG_DATA_HOME"
 
 # fix docker dirs
 export DOCKER_CONFIG="$XDG_CONFIG_HOME/docker"
@@ -48,8 +45,3 @@ export NPM_CONFIG_USERCONFIG="$XDG_CONFIG_HOME/npm/npmrc"
 
 # fix java dirs
 export _JAVA_OPTIONS="-Djava.util.prefs.userRoot=$XDG_CONFIG_HOME/java"
-
-
-# pico SDK
-export PICO_SDK_PATH="$HOME/.local/rpi/pico-sdk"
-
diff --git a/private_dot_config/fish/config.fish b/private_dot_config/fish/config.fish
index 04bbbe4..9a1723f 100644
--- a/private_dot_config/fish/config.fish
+++ b/private_dot_config/fish/config.fish
@@ -1,4 +1,4 @@
-source "$HOME/.config/env"
+source "$HOME/.config/env/all"
 
 if status is-interactive
 
@@ -9,8 +9,6 @@ if status is-interactive
 
     export EDITOR=vim
 
-    # TODO: ssh-agent
-
     # fuzzy find
     export FZF_CTRL_T_OPTS="
     --walker-skip .git,node_modules,target,.var
diff --git a/private_dot_local/bin/executable_elf_packages b/private_dot_local/bin/executable_elf_packages
new file mode 100644
index 0000000..2548499
--- /dev/null
+++ b/private_dot_local/bin/executable_elf_packages
@@ -0,0 +1,104 @@
+#!/usr/bin/env bash
+
+SCRIPTS_DIR="$HOME/.local/share/elfos"
+
+function print_help() {
+    echo "usage: elf_packages <ACTION>"
+    echo
+    echo "ACTION:"
+    echo "  list                list available scripts"
+    echo "  install <script>    execute install script"
+    echo "  uninstall <script>  execute remove script"
+    echo "  help                display this help"
+}
+
+function check_if_script_exists() {
+    script="$1"
+
+    if [[ ! -f "$SCRIPTS_DIR/$script.sh" ]]
+    then
+        echo "ERROR: $script does not exists"
+        print_help
+        return 1
+    else
+        return 0
+    fi
+}
+
+function install_pacman_deps() {
+    deps="$1"
+
+    pacman -Sy --noconfirm $deps
+}
+
+function update() {
+    script="$1"
+
+    check_if_script_exists "$script" || return 1
+
+    . "$SCRIPTS_DIR/$script.sh"
+
+    if package_check_installed
+    then
+        package_update
+    else
+        echo "package not installed"
+    fi
+}
+
+function uninstall() {
+    script="$1"
+
+    check_if_script_exists "$script" || return 1
+
+    . "$SCRIPTS_DIR/$script.sh"
+
+    if package_check_installed
+    then
+        package_remove
+    else
+        echo "package not installed"
+    fi
+}
+
+function update() {
+    script="$1"
+
+    check_if_script_exists "$script" && return 1
+
+    . "$SCRIPTS_DIR/$script"
+    package_update
+}
+
+case $1 in
+    list)
+        find "$SCRIPTS_DIR" -maxdepth 1 -name '*.sh' \
+            -exec basename "{}" ';' \
+            | sed -e 's/\.sh$//'
+        ;;
+    install)
+        shift
+        install $*
+        ;;
+    uninstall)
+        shift
+        uninstall $*
+        ;;
+    update)
+        shift
+        update $*
+        ;;
+    help)
+        print_help
+        ;;
+    "--help")
+        print_help
+        ;;
+    "-h")
+        print_help
+        ;;
+    *) 
+        echo "ERROR: invalid action $1"
+        print_help
+        ;;
+esac
diff --git a/private_dot_local/bin/executable_linesofcode b/private_dot_local/bin/executable_linesofcode
index 61f6669..3c8b5d0 100644
--- a/private_dot_local/bin/executable_linesofcode
+++ b/private_dot_local/bin/executable_linesofcode
@@ -1,4 +1,11 @@
 #!/usr/bin/env bash
 
-cat "$1"/* | sed -e 's|//.*$||' -e 's|^[ \t]*||' | grep -v '^[ \t]*$' | awk '/\/\*/ {s=1} /\*\// && s==1 {s=0} !s' | grep -v '^.$' | grep -v '^..$' | grep -v '^...$' | wc -l
+cat "$1"/* \
+    | sed -e 's|//.*$||' -e 's|^[ \t]*||' \
+    | grep -v '^[ \t]*$' \
+    | awk '/\/\*/ {s=1} /\*\// && s==1 {s=0} !s' \
+    | grep -v '^.$' \
+    | grep -v '^..$' \
+    | grep -v '^...$' \
+    | wc -l
 
diff --git a/private_dot_local/bin/executable_shuffle b/private_dot_local/bin/executable_shuffle
index 58532d4..ee852fe 100644
--- a/private_dot_local/bin/executable_shuffle
+++ b/private_dot_local/bin/executable_shuffle
@@ -19,7 +19,7 @@ function pick_song() {
   playlist_path="$PLAYLIST_DIR/$playlist.pls"
   if [[ ! -f "$playlist_path" ]]
   then
-    echo "error: playlist $playlist not found"
+    echo "ERROR: playlist $playlist not found" >&2
     exit 1
   fi
 
diff --git a/private_dot_local/bin/executable_update_env b/private_dot_local/bin/executable_update_env
new file mode 100644
index 0000000..619594e
--- /dev/null
+++ b/private_dot_local/bin/executable_update_env
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+cat "$(find "$HOME/.config/env" -name '*.env' -type f)" \
+    >"$HOME/.config/env/all"
diff --git a/private_dot_local/share/elfos/common/block_in_file.sh b/private_dot_local/share/elfos/common/block_in_file.sh
new file mode 100644
index 0000000..345c5fa
--- /dev/null
+++ b/private_dot_local/share/elfos/common/block_in_file.sh
@@ -0,0 +1,195 @@
+
+function __block_in_file__help() {
+    local func="$1"
+    if [[ "$func" = "update" ]]
+    then
+    echo "block_in_file [<OPTIONS>] <FILE> <ID> <BLOCK>"
+    else
+    echo "block_in_file_remove [<OPTIONS>] <FILE> <ID>"
+    fi
+    echo "$func [<OPTIONS>] <FILE> <ID> <BLOCK>"
+    echo
+    echo "OPTIONS:"
+    if [[ "$func" = "update" ]]
+    then
+    echo "  --before <MATCH>       insert block before matched line"
+    echo "  --after <MATCH>        insert block after matched line"
+    fi
+    echo "  --id-start-pre <str>   set id-start-pre to str"
+    echo "  --id-start-post <str>  set id-start-post to str"
+    echo "  --id-end-pre <str>     set id-end-pre to str"
+    echo "  --id-end-post <str>    set id-end-post to str"
+    echo
+    echo "ID:"
+    echo "  an identifier string to regonise the block."
+    if [[ "$func" = "update" ]]
+    then
+    echo
+    echo "MATCH:"
+    echo "  line search/match string in grep format"
+    fi
+    echo
+    echo "block fomat:"
+    echo "  <id-start-pre><id><id-start-post>"
+    echo "  <block>"
+    echo "  <id-end-pre><id><id-end-post>"
+}
+
+function block_in_file() {
+    __block_in_file__inner "update" $*
+}
+
+function block_in_file_remove() {
+    __block_in_file__inner "remove" $*
+}
+
+function __block_in_file__inner() {
+    local FN="$1"
+    local BEFORE="EOF"
+    local AFTER="SOF"
+    local ID_START_PRE="#START manged by elf_packages: "
+    local ID_START_POST=""
+    local ID_END_PRE="#END "
+    local ID_END_POST=""
+    while [[ $1 == \-* ]]
+    do
+        case "$1" in
+            "--before")
+                if [[ "$FN" = "update" ]]
+                then
+                    shift
+                    BEFORE="$1"
+                    shift
+                else
+                    echo "ERROR: invalid options $1"
+                    __block_in_file__help "$FN"
+                    exit 1
+                fi
+                ;;
+            "--after")
+                if [[ "$FN" = "update" ]]
+                then
+                    shift
+                    AFTER="$1"
+                    shift
+                else
+                    echo "ERROR: invalid options $1"
+                    __block_in_file__help "$FN"
+                    exit 1
+                fi
+                ;;
+            "--id-start-pre")
+                shift
+                ID_START_PRE="$1"
+                shift
+                ;;
+            "--id-start-post")
+                shift
+                ID_START_POST="$1"
+                shift
+                ;;
+            "--id-end-pre")
+                shift
+                ID_END_PRE="$1"
+                shift
+                ;;
+            "--id-end-post")
+                shift
+                ID_END_POST="$1"
+                shift
+                ;;
+            "--")
+                shift
+                break
+                ;;
+            *)
+                echo "ERROR: invalid options $1"
+                __block_in_file__help "$FN"
+                exit 1
+                ;;
+        esac
+    done
+    local FILE="$1"
+    local ID="$2"
+    local BLOCK="$3"
+
+    if [[ ! -f "$FILE" ]]
+    then
+        echo "ERROR: file not found: $FILE"
+        exit 1
+    fi
+
+    local id_start_line="${ID_START_PRE}${ID}${ID_START_POST}"
+    local id_end_line="${ID_END_PRE}${ID}${ID_END_POST}"
+
+    if [[ "$func" = "update" ]]
+    then
+        block_in_file "$FILE" "$id_start_line" "$id_end_line" "$BEFORE" "$AFTER" "$BLOCK"
+    else
+        block_in_file_remove "$FILE" "$id_start_line" "$id_end_line" "$BLOCK"
+    fi
+}
+
+function __block_in_file__inner_update() {
+    local file="$1"
+    local id_start_line="$2"
+    local id_end_line="$3"
+    local before="$4"
+    local after="$5"
+    local block="$6"
+
+    if [[ -z "$(grep "^$id_start_line\$" "$file")" ]]
+    then
+        # no existing block. add a new one
+        if [ "$before" == "EOF" ]
+        then
+            before="$(($(cat "$file" | wc --lines) + 1))"
+        else
+            before="$(grep --line-number -e "$before" "$file" | head --lines=1 | awk -F: '{{print $1}}')"
+        fi
+        if [ "$after" == "SOF" ]
+        then
+            after="0"
+        else
+            after="$(grep --line-number -e "$after" "$file" | head --lines=1 | awk -F: '{{print $1}}')"
+        fi
+        
+        if [[ $after > $before ]]; then
+            echo "ERROR: after is bigger than before, no place to put the block"
+            exit 1
+        fi
+
+        tmp_file=$(mktemp)
+        head --lines=$AFTER "$file"           >"$tmp_file"
+        echo "$id_start_line"                 >>"$tmp_file"
+        echo "$block"                         >>"$tmp_file"
+        echo "$id_end_line"                   >>"$tmp_file"
+        tail --lines=+$(($AFTER + 1)) "$file" >>"$tmp_file"
+        mv "$tmp_file" "$file"
+    else
+        # update existing block
+        local start="$(grep --line-number -e "^$id_start_line\$" "$file" | head --lines=1 | awk -F: '{{print $1}}')"
+        local end="$(grep --line-number -e "^$id_end_line\$" "$file" | head --lines=1 | awk -F: '{{print $1}}')"
+
+        local tmp_file=$(mktemp)
+        head --lines=$start "$file" >"$tmp_file"
+        echo "$block"               >>"$tmp_file"
+        tail --lines=+$end "$file"  >>"$tmp_file"
+        mv "$tmp_file" "$file"
+    fi
+}
+
+function __block_in_file__inner_remove() {
+    local file="$1"
+    local id_start_line="$2"
+    local id_end_line="$3"
+    local block="$4"
+
+    local start="$(grep --line-number -e "^$id_start_line\$" "$file" | head --lines=1 | awk -F: '{{print $1}}')"
+    local end="$(grep --line-number -e "^$id_end_line\$" "$file" | head --lines=1 | awk -F: '{{print $1}}')"
+
+    local tmp_file=$(mktemp)
+    head --lines=$(($start - 1)) "$file"   >"$tmp_file"
+    tail --lines=+$(($start + 1)) "$file"  >>"$tmp_file"
+    mv "$tmp_file" "$file"
+}
diff --git a/private_dot_local/share/elfos/esp-idf.sh b/private_dot_local/share/elfos/esp-idf.sh
new file mode 100644
index 0000000..6132b85
--- /dev/null
+++ b/private_dot_local/share/elfos/esp-idf.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+export PACKAGE_DEPS_PACMAN="flex bison gperf ninja ccache libffi dfu-util libusb"
+
+function package_install() {
+    mkdir -p "$XDG_DATA_HOME/espressif"
+    git clone --recursive --depth=1 https://github.com/espressif/esp-idf.git \
+        "$XDG_DATA_HOME/espressif/esp-idf"
+    git clone --recursive --depth=1 https://github.com/espressif/idf-extra-components.git \
+        "$XDG_DATA_HOME/espressif/idf-extra-components"
+    git clone --recursive --depth=1 https://github.com/espressif/esp-protocols.git \
+        "$XDG_DATA_HOME/espressif/esp-protocols"
+    git clone --recursive --depth=1 https://github.com/espressif/esp-zigbee-sdk.git \
+        "$XDG_DATA_HOME/espressif/esp-zigbee-sdk"
+
+    echo 'export IDF_TOOLS_PATH="$XDG_DATA_HOME/espressif"' \
+        >"$XDG_CONFIG_HOME/env/esp-idf.env"
+    update_env
+    . "$SESSION_ENV_FILE"
+
+    "$XDG_DATA_HOME/espressif/esp-idf/install.sh" all
+}
+
+function package_update() {
+    git -C "$XDG_DATA_HOME/espressif/esp-idf" pull
+    git -C "$XDG_DATA_HOME/espressif/idf-extra-components" pull
+    git -C "$XDG_DATA_HOME/espressif/esp-protocols" pull
+    git -C "$XDG_DATA_HOME/espressif/esp-zigbee-sdk" pull
+}
+
+function package_remove() {
+    rm -rf "$XDG_DATA_HOME/espressif"
+    rm "$XDG_CONFIG_HOME/env/esp-idf.env"
+}
+
+function package_check_installed() {
+    [[ -d "$XDG_DATA_HOME/espressif" ]] 
+}
diff --git a/private_dot_local/share/elfos/oh-my-posh.sh b/private_dot_local/share/elfos/oh-my-posh.sh
new file mode 100644
index 0000000..b314031
--- /dev/null
+++ b/private_dot_local/share/elfos/oh-my-posh.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+function package_install() {
+    curl -s https://ohmyposh.dev/install.sh | bash -s
+}
+
+function package_update() {
+    #TODO
+}
+
+function package_remove() {
+    #TODO
+}
+
+function package_check_installed() {
+    #TODO
+}
diff --git a/private_dot_local/share/elfos/py-glob.sh b/private_dot_local/share/elfos/py-glob.sh
new file mode 100644
index 0000000..9c43e0c
--- /dev/null
+++ b/private_dot_local/share/elfos/py-glob.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+function package_install() {
+    mkdir -p $HOME/.local/py-glob
+    python3 -m venv $HOME/.local/py-glob
+}
+
+function package_update() {
+    #TODO
+    echo
+}
+
+function package_remove() {
+    rm -rf "$HOME/.local/py-glob"
+}
+
+function package_check_installed() {
+    [[ -d "$HOME/.local/py-glob" ]]
+}
diff --git a/private_dot_local/share/elfos/rustup.sh b/private_dot_local/share/elfos/rustup.sh
new file mode 100644
index 0000000..ef6fa5c
--- /dev/null
+++ b/private_dot_local/share/elfos/rustup.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+function package_install() {
+    echo 'export RUSTUP_HOME="$XDG_DATA_HOME/rustup"' >"$XDG_CONFIG_HOME/env/rustup.env"
+    echo 'export CARGO_HOME="$XDG_DATA_HOME/cargo"' >>"$XDG_CONFIG_HOME/env/rustup.env"
+
+    . "$SESSION_ENV_FILE"
+
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs >/tmp/rustup.sh
+    sh /tmp/rustup.sh -y
+    rm /tmp/rustup.sh
+}
+
+function package_update() {
+    #TODO
+}
+
+function package_remove() {
+    #TODO
+
+    rm "$XDG_CONFIG_HOME/env/rustup.env"
+}
+
+function package_check_installed() {
+    #TODO
+}
+