Harden installers and wrappers

Zsh/.zshrc

@@ -16,13 +16,45 @@ export DOTZSH_SYNTAX_HIGHLIGHTING_PLUGIN="$ZSH/custom/plugins/zsh-syntax-highlig
 # Programming Languages Root
 export PROG_DIR="$HOME/.programming"
 
+typeset -gA DOTZSH_MISSING_TOOL_WARNED
+
+dotzsh_warn_missing_tool_once() {
+    local tool_key="$1"
+    local tool_label="$2"
+    local setup_hint="$3"
+
+    if [[ -n "${DOTZSH_MISSING_TOOL_WARNED[$tool_key]:-}" ]]; then
+        return 0
+    fi
+
+    DOTZSH_MISSING_TOOL_WARNED[$tool_key]=1
+
+    print -u2 -- "$tool_label is not installed on this system."
+    print -u2 -- "Run: $setup_hint"
+    print -u2 -- "Or:  just setup all"
+}
+
 # Go and GVM (Black Box)
 export GOPATH="$PROG_DIR/go"
 export GVM_ROOT="$GOPATH"
 
 gvm_load() {
+    local requested_command="$1"
+
     unset -f gvm go gofmt
-    [[ -s "$GVM_ROOT/scripts/gvm" ]] && source "$GVM_ROOT/scripts/gvm"
+
+    if [[ ! -s "$GVM_ROOT/scripts/gvm" ]]; then
+        dotzsh_warn_missing_tool_once "go" "Go / GVM" "just lang go"
+        return 127
+    fi
+
+    source "$GVM_ROOT/scripts/gvm"
+
+    if ! command -v "$requested_command" >/dev/null 2>&1; then
+        dotzsh_warn_missing_tool_once "go" "Go / GVM" "just lang go"
+        return 127
+    fi
+
     "$@"
 }
 
@@ -34,8 +66,22 @@ gofmt() { gvm_load gofmt "$@"; }
 export NVM_DIR="$PROG_DIR/node"
 
 nvm_load() {
+    local requested_command="$1"
+
     unset -f nvm node npm npx
-    [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
+
+    if [[ ! -s "$NVM_DIR/nvm.sh" ]]; then
+        dotzsh_warn_missing_tool_once "node" "Node / NVM" "just lang node"
+        return 127
+    fi
+
+    . "$NVM_DIR/nvm.sh"
+
+    if ! command -v "$requested_command" >/dev/null 2>&1; then
+        dotzsh_warn_missing_tool_once "node" "Node / NVM" "just lang node"
+        return 127
+    fi
+
     "$@"
 }
 
@@ -55,15 +101,41 @@ export CONDA_ROOT="$PYENV_ROOT/versions/miniforge3-latest"
 
 pyenv_load() {
     unset -f pyenv
+
+    if ! command -v pyenv >/dev/null 2>&1; then
+        dotzsh_warn_missing_tool_once "python" "Pyenv / Python" "just lang python"
+        return 127
+    fi
+
     eval "$(command pyenv init -)"
+
+    if ! command -v pyenv >/dev/null 2>&1; then
+        dotzsh_warn_missing_tool_once "python" "Pyenv / Python" "just lang python"
+        return 127
+    fi
+
     pyenv "$@"
 }
 
 pyenv() { pyenv_load "$@"; }
 
 conda_load() {
+    local requested_command="$1"
+
     unset -f conda mamba
-    [ -f "$CONDA_ROOT/etc/profile.d/conda.sh" ] && source "$CONDA_ROOT/etc/profile.d/conda.sh"
+
+    if [[ ! -f "$CONDA_ROOT/etc/profile.d/conda.sh" ]]; then
+        dotzsh_warn_missing_tool_once "python" "Conda / Mamba" "just lang python"
+        return 127
+    fi
+
+    source "$CONDA_ROOT/etc/profile.d/conda.sh"
+
+    if ! command -v "$requested_command" >/dev/null 2>&1; then
+        dotzsh_warn_missing_tool_once "python" "Conda / Mamba" "just lang python"
+        return 127
+    fi
+
     "$@"
 }