Enable pdf conversion as a oneshot command in docker

Dockerfile

@@ -6,6 +6,9 @@ RUN composer install --no-dev --optimize-autoloader --no-progress --no-suggest
 # Build the actual image
 FROM php
 
+WORKDIR /resume
+CMD ["/bin/bash"]
+
 RUN apt-get update \
 	&& apt-get install -qqy --no-install-recommends\
         # This is for enabling the program to be run with watch
@@ -16,11 +19,15 @@ RUN apt-get update \
         xauth \
 	&& rm -rf /var/lib/apt/lists/*
 
+# Wrap pdf creation in a xvfb-run to enable headless pdf creation in the container
+RUN printf '#!/bin/bash\nexec xvfb-run md2resume pdf "$@"' >> /usr/bin/md2pdf \
+    && chmod +x /usr/bin/md2pdf
+
+# Enables continously calling a command and piping the output to STDOUT, viewable via docker logs
+RUN printf '#!/bin/bash\nwhile sleep 1; do\n    "$@"\ndone' >> /usr/bin/watch-docker \
+    && chmod +x /usr/bin/watch-docker
+
 COPY --from=composer /app/vendor /app/vendor
 COPY . /app
 
 RUN ln -s /app/bin/md2resume /usr/bin/md2resume
-
-RUN echo "alias md2pdf=\"xvfb-run md2resume pdf\"" >> ~/.bashrc
-
-WORKDIR /resume

README.md

@@ -19,12 +19,21 @@ at the [blog post for the project][blog], or look in examples/output to see samp
 
 ### Docker
 
-Run this in the directory where you put your markdown resume:
+Run those commands in the directory where you put your markdown resume.
 
-`docker run -it -v ${PWD}:/resume there4/markdown-resume bash`
+The command for PDF creation works differently in a container, use `md2pdf` instead of the usual command.
 
-In the docker console, you can run `md2resume` on your files.  
+#### Oneshot command
-For PDF conversion, run `md2pdf` instead of the usual command.
+
+This is best suited for use in scripts or in CI environments:
+
+`docker run -v ${PWD}:/resume there4/markdown-resume md2resume [options] command [arguments]`
+
+#### Interactive console
+
+This allows you to enter an interactive console where you can easily experiment and run different commands:
+
+`docker run -it -v ${PWD}:/resume there4/markdown-resume`
 
 ### Local