remove newlines after headings

README.md

@@ -1,5 +0,0 @@
-# nix_virtualenvs
-
-This is a repository for different virtual environments, which can be used with the **Nix** package manager.
-
-Just copy the content of the desired folder to your project, add your required packages to the `*.txt` file and run `nix-shell`.

README.org

@@ -0,0 +1,34 @@
+* nix_environments
+
+  This is a set of various environments which can be used with the *Nix* package manager.
+
+  Copy the =shell.nix= file from the desired folder into your project and run ~nix-shell~.
+  This will drop you into a virtual environment with all requirements fulfilled.
+  Please check below how the virtual environments work and how to add environment specific packages.
+ 
+  If you need more Nix packages in your environent, enhance the list ~buildInputs~ in the file =shell.nix=.
+
+** node
+
+   This environment does the following:
+
+   1. Create a directory =.npm/bin= if not existent
+   2. Add the =.npm/bin= directory to the ~$PATH~ variable
+   3. Upgrade npm to the latest version
+   4. If the file =global_packages.txt= is present, install the packages via npm into the =.npm= directory
+   5. Run ~npm install~ if a file =package.json= is present
+
+** python
+
+   This environment does the following:
+
+   1. Create a new python virtualenv in the folder =.venv= if not existent
+   2. Source the virtual environment
+   3. Upgrade pip to the latest version
+   4. If present, install the packages from the file =requirements.txt= via pip
+
+** rust
+
+   This environment does the following:
+
+   1. Run ~cargo build~ if =Cargo.toml= is present

node/shell.nix

@@ -0,0 +1,38 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    nodejs
+  ];
+  shellHook = ''
+    function log_header {
+      echo -ne "==> \e[32m\e[1m$1\e[0m\n"
+    }
+    function log_subheader {
+      echo -ne "--> \e[33m\e[1m$1\e[0m\n"
+    }
+    function log {
+      echo -ne "    $1\n"
+    }
+    
+    echo ""
+    log_header "node_environment"
+    mkdir -p .npm/bin
+    export PATH=$PWD/.npm/bin:$PATH
+    log_subheader "upgrading npm"
+    npm install -g npm --prefix $PWD/.npm
+    echo ""
+    if [ -s global_packages.txt ]; then
+      log_subheader "found global_packages.txt, installing packages"
+      cat global_packages.txt | xargs npm install -g --prefix $PWD/.npm
+      echo ""
+    fi
+    if [ -s package.json ]; then
+      log_subheader "found package.json, running 'npm install'"
+      npm install
+      echo ""
+    fi
+    log_header "package versions"
+    log "node $(node --version)"
+    log "npm $(npm --version)"
+  '';
+}

node_environment/default.nix

@@ -1,19 +0,0 @@
-with import <nixpkgs> {};
-
-stdenv.mkDerivation {
-  name = "myNodeEnv";
-  buildInputs = with pkgs; [
-    nodejs
-  ];
-  src = null;
-  shellHook = ''
-    mkdir -p .npm
-    if [ -s global_packages.txt ]; then
-      cat global_packages.txt | xargs npm install -g --prefix $PWD/.npm
-    fi
-    if [ -s package.json ]; then
-      npm install
-    fi
-    export PATH=$PWD/.npm/bin:$PATH
-  '';
-}

python/shell.nix

@@ -0,0 +1,36 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    python3
+    python3Packages.virtualenv
+  ];
+  shellHook = ''
+    function log_header {
+      echo -ne "==> \e[32m\e[1m$1\e[0m\n"
+    }
+    function log_subheader {
+      echo -ne "--> \e[33m\e[1m$1\e[0m\n"
+    }
+    function log {
+      echo -ne "    $1\n"
+    }
+
+    echo ""
+    log_header "python_environment"
+    if [ ! -d .venv ]; then
+      python -m venv .venv
+    fi
+    source .venv/bin/activate
+    log_subheader "upgrading pip"
+    pip install --upgrade pip
+    echo ""
+    if [ -s requirements.txt ]; then
+      log_subheader "found requirements.txt, installing packages"
+      pip install -r requirements.txt
+      echo ""
+    fi
+    log_header "package versions"
+    log "$(python --version)"
+    log "$(pip --version)"
+  '';
+}

python_environment/default.nix

@@ -1,20 +0,0 @@
-with import <nixpkgs> {};
-
-stdenv.mkDerivation {
-  name = "myPythonEnv";
-  buildInputs = with pkgs; [
-    python38Full
-    python38Packages.virtualenv
-  ];
-  src = null;
-  shellHook = ''
-    if [ ! -d .venv ]; then
-      python -m venv .venv
-    fi
-    source .venv/bin/activate
-    pip install --upgrade pip
-    if [ -s requirements.txt ]; then
-      pip install -r requirements.txt
-    fi
-  '';
-}

rust/shell.nix

@@ -0,0 +1,31 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  NIX_ENFORCE_PURITY=0;
+  buildInputs = with pkgs; [
+    cargo
+    rustc
+    rustfmt
+  ];
+  shellHook = ''
+    function log_header {
+      echo -ne "==> \e[32m\e[1m$1\e[0m\n"
+    }
+    function log_subheader {
+      echo -ne "--> \e[33m\e[1m$1\e[0m\n"
+    }
+    function log {
+      echo -ne "    $1\n"
+    }
+
+    echo ""
+    log_header "rust_environment"
+    if [ -s Cargo.toml ]; then
+      log_subheader "found Cargo.toml, running 'cargo-build'"
+      cargo build
+      echo ""
+    fi
+    log_header "package versions"
+    log "$(rustc --version)"
+    log "$(cargo --version)"
+  '';
+}