Fixes #182 detect existing virtualenv instead of creating a new envir…

…onment (#184)

.utility/deploy_docs.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
 
 if [ "$TRAVIS_BRANCH" == "master" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
-    pip install --user virtualenv
     cp ./generate_ci.sh ./generate_copy.sh
     chmod +x ./generate_copy.sh
     ./generate_copy.sh

README.md

@@ -73,24 +73,13 @@ Currently Yaydoc only supports publishing to ghpages. More publishers to be adde
 ## Travis Configuration
 Add the following content to the `.travis.yml` file in the root directory of your repository.
 
-**If the primary language is Python**
-
 ```yaml
 deploy:
   - provider: script
     skip_cleanup: true
     script: wget -O - https://raw.githubusercontent.com/fossasia/yaydoc/master/generate_ci.sh | bash
 ```
 
-**For Languages other than Python**
-
-```yaml
-deploy:
-  - provider: script
-    skip_cleanup: true
-    script: pip install --user virtualenv && wget -O - https://raw.githubusercontent.com/fossasia/yaydoc/master/generate_ci.sh | bash
-```
-
 ## Using SSH
 Additionally If you have ssh setup on your repository, yaydoc prioritizes it over Github Personal token. To setup ssh follow these steps. 
 

generate.sh

@@ -14,6 +14,9 @@ do
  esac
 done
 
+# https://stackoverflow.com/a/15454916/4127836
+INVENV=$(python -c 'import sys; print ("true" if hasattr(sys, "real_prefix") else "false")')
+
 # Ensures that BASE has contents of yaydoc repository
 # and change current directory to git repository.
 if [ "${WEBUI:-false}" == "true" ]; then
@@ -42,10 +45,16 @@ ROOT_DIR=$(pwd)
 
 if [ -z "$ON_HEROKU" ]; then
   # Create an isolated Python environment
-  echo -e "Creating an isolated Python environment\n"
-  virtualenv -q --python=python $HOME/yaydocvenv
-  source $HOME/yaydocvenv/bin/activate
-  echo -e "Python environment created successfully!\n"
+  if [ "$INVENV" == "false" ]; then
+    echo -e "Installing virtualenv\n"
+    pip install -q --user virtualenv
+    echo -e "Installation successful\n"
+
+    echo -e "Creating an isolated Python environment\n"
+    virtualenv -q --python=python $HOME/yaydocvenv
+    source $HOME/yaydocvenv/bin/activate
+    echo -e "Python environment created successfully!\n"
+  fi
 
   # Install packages required for documentation generation
   echo -e "Installing packages required for documentation generation\n"

generate_ci.sh

@@ -5,7 +5,9 @@ function clean() {
   cd $ROOT_DIR
   rm -rf $BUILD_DIR
   rm -rf $BASE
-  deactivate
+  if [ "$INVENV" == "false" ]; then
+    deactivate
+  fi
 }
 
 # Generate documentation