Fixes code blocks in readme.md.

readme.md

@@ -16,20 +16,23 @@ Pubs is built with the following principles in mind:
 ## Installation
 
 You can install the latest stable version of `pubs` through Pypi, with:
-
-    pip install pubs
+  ```
+  pip install pubs
+  ```
 
 Alternatively, you can:
 
   - install the latest development version with pip:
-
+    ```
     pip install --upgrade git+https://github.com/pubs/pubs
+    ```
 
   - clone the repository and install it manually:
-
+    ```
     git clone https://github.com/pubs/pubs
     cd pubs
     python setup.py install [--user]
+    ```
 
 Arch Linux users can also use the [pubs-git](https://aur.archlinux.org/packages/pubs-git/) AUR package.
 
@@ -37,28 +40,34 @@ Arch Linux users can also use the [pubs-git](https://aur.archlinux.org/packages/
 ## Getting started
 
 Create your library (by default, goes to `~/.pubs/`).
-
-    pubs init
+  ```
+  pubs init
+  ```
 
 Import existing data from bibtex (pubs will try to automatically copy documents defined as 'file' in bibtex):
-
-    pubs import path/to/collection.bib
+  ```
+  pubs import path/to/collection.bib
+  ```
 
 or for a .bib file containing a single reference:
-
-    pubs add reference.bib -d article.pdf
+  ```
+  pubs add reference.bib -d article.pdf
+  ```
 
 pubs can also automatically retrieve the bibtex from a doi:
-
-    pubs add -D 10.1007/s00422-012-0514-6 -d article.pdf
+  ```
+  pubs add -D 10.1007/s00422-012-0514-6 -d article.pdf
+  ```
 
 or an ISBN (dashes are ignored):
-
-    pubs add -I 978-0822324669 -d article.pdf
+  ```
+  pubs add -I 978-0822324669 -d article.pdf
+  ```
 
 or an arXiv id (automatically downloading arXiv article is in the works):
-
-    pubs add -X math/9501234 -d article.pdf
+  ```
+  pubs add -X math/9501234 -d article.pdf
+  ```
 
 
 ## References always up-to-date
@@ -66,8 +75,9 @@ or an arXiv id (automatically downloading arXiv article is in the works):
 If you use latex, you can automatize references, by running `pubs export > references.bib` each time you update your library, which also fits well as a `makefile` rule.
 
 This ensures that your reference file is always up-to-date; you can cite a paper in your manuscript a soon as you add it in pubs. This means that if you have, for instance, a doi on a webpage, you only need to do:
-
-    pubs add -D 10.1007/s00422-012-0514-6
+  ```
+  pubs add -D 10.1007/s00422-012-0514-6
+  ```
 
 and then add `\cite{Loeb_2012}` in your manuscript. After exporting the bibliography, the citation will correctly appear in your compiled pdf.
 
@@ -75,23 +85,25 @@ and then add `\cite{Loeb_2012}` in your manuscript. After exporting the bibliogr
 ## Document management
 
 You can attach a document to a reference:
-
-    pubs add Loeb2012_downloaded.pdf Loeb_2012
+  ```
+  pubs add Loeb2012_downloaded.pdf Loeb_2012
+  ```
 
 And open your documents automatically from the command line:
-
-    pubs doc open Loeb_2012
-    pubs doc open --with lp Loeb_2012  # Opens the document with `lp` to actually print it.
-
+  ```
+  pubs doc open Loeb_2012
+  pubs doc open --with lp Loeb_2012  # Opens the document with `lp` to actually print it.
+  ```
 
 ## Customization
 
 Pubs is designed to interact well with your command line tool chain.
 You can add custom commands to pubs by defining aliases in your configuration file (make sure that the alias plugin is activated in your configuration by using `pubs conf`).
-
-    [[alias]]
-    evince = open --with evince
-    count = !pubs list -k "$@" | wc -l
+  ```ini
+  [[alias]]
+  evince = open --with evince
+  count = !pubs list -k "$@" | wc -l
+  ```
 
 The first command defines a new subcommand: `pubs open --with evince` will be executed when `pubs evince` is typed.
 The second starts with a bang: `!`, and is treated as a shell command. If other arguments are provided they are passed to the shell command as in a script. In the example above the `count` alias can take arguments that are be passed to the `pubs list -k` command, hence enabling filters like `pubs count year:2012`.
@@ -102,14 +114,14 @@ The second starts with a bang: `!`, and is treated as a shell command. If other
 For autocompletion to work, you need the [argcomplete](https://argcomplete.readthedocs.io) Python package, and Bash 4.2 or newer. For activating *bash* or *tsch* completion, consult the [argcomplete documentation](https://argcomplete.readthedocs.io/en/latest/#global-completion).
 
 For *zsh* completion, the global activation is not supported but bash completion compatibility can be used for pubs. For that, add the following to your `.zshrc`:
-
-    # Enable and load bashcompinit
-    autoload -Uz compinit bashcompinit
-    compinit
-    bashcompinit
-    # Argcomplete explicit registration for pubs
-    eval "$(register-python-argcomplete pubs)"
-
+  ```shell
+  # Enable and load bashcompinit
+  autoload -Uz compinit bashcompinit
+  compinit
+  bashcompinit
+  # Argcomplete explicit registration for pubs
+  eval "$(register-python-argcomplete pubs)"
+  ```
 
 ## Need more help ?