diff options
Diffstat (limited to 'plugins/colorize')
| -rw-r--r-- | plugins/colorize/README.md | 48 | ||||
| -rw-r--r-- | plugins/colorize/colorize.plugin.zsh | 119 |
2 files changed, 150 insertions, 17 deletions
diff --git a/plugins/colorize/README.md b/plugins/colorize/README.md new file mode 100644 index 000000000..ee4ab8036 --- /dev/null +++ b/plugins/colorize/README.md @@ -0,0 +1,48 @@ +# colorize + +With this plugin you can syntax-highlight file contents of over 300 supported languages and other text formats. + +Colorize will highlight the content based on the filename extension. If it can't find a syntax-highlighting +method for a given extension, it will try to find one by looking at the file contents. If no highlight method +is found it will just cat the file normally, without syntax highlighting. + +## Setup + +To use it, add colorize to the plugins array of your `~/.zshrc` file: +``` +plugins=(... colorize) +``` + +## Configuration + +### Requirements + +This plugin requires that at least one of the following tools is installed: + +* [Chroma](https://github.com/alecthomas/chroma) +* [Pygments](https://pygments.org/download/) + +### Colorize tool + +Colorize supports `pygmentize` and `chroma` as syntax highlighter. By default colorize uses `pygmentize` unless it's not installed and `chroma` is. This can be overridden by the `ZSH_COLORIZE_TOOL` environment variable: + +``` +ZSH_COLORIZE_TOOL=chroma +``` + +### Styles + +Pygments offers multiple styles. By default, the `default` style is used, but you can choose another theme by setting the `ZSH_COLORIZE_STYLE` environment variable: + +``` +ZSH_COLORIZE_STYLE="colorful" +``` + +## Usage + +* `ccat <file> [files]`: colorize the contents of the file (or files, if more than one are provided). + If no files are passed it will colorize the standard input. + +* `cless [less-options] <file> [files]`: colorize the contents of the file (or files, if more than one are provided) and open less. + If no files are passed it will colorize the standard input. + The LESSOPEN and LESSCLOSE will be overwritten for this to work, but only in a local scope. diff --git a/plugins/colorize/colorize.plugin.zsh b/plugins/colorize/colorize.plugin.zsh index 11b58e69d..6ed9739fa 100644 --- a/plugins/colorize/colorize.plugin.zsh +++ b/plugins/colorize/colorize.plugin.zsh @@ -1,28 +1,113 @@ -# Plugin for highlighting file content -# Plugin highlights file content based on the filename extension. -# If no highlighting method supported for given extension then it tries -# guess it by looking for file content. +# Easier alias to use the plugin +alias ccat="colorize_cat" +alias cless="colorize_less" -alias colorize='colorize_via_pygmentize' +# '$0:A' gets the absolute path of this file +ZSH_COLORIZE_PLUGIN_PATH=$0:A -colorize_via_pygmentize() { - if [ ! -x "$(which pygmentize)" ]; then - echo "package \'pygmentize\' is not installed!" - return -1 +colorize_check_requirements() { + local available_tools=("chroma" "pygmentize") + + if [ -z "$ZSH_COLORIZE_TOOL" ]; then + if (( $+commands[pygmentize] )); then + ZSH_COLORIZE_TOOL="pygmentize" + elif (( $+commands[chroma] )); then + ZSH_COLORIZE_TOOL="chroma" + else + echo "Neither 'pygments' nor 'chroma' is installed!" >&2 + return 1 + fi fi + if [[ ${available_tools[(Ie)$ZSH_COLORIZE_TOOL]} -eq 0 ]]; then + echo "ZSH_COLORIZE_TOOL '$ZSH_COLORIZE_TOOL' not recognized. Available options are 'pygmentize' and 'chroma'." >&2 + return 1 + elif (( $+commands["$ZSH_COLORIZE_TOOL"] )); then + echo "Package '$ZSH_COLORIZE_TOOL' is not installed!" >&2 + return 1 + fi +} + +colorize_cat() { + if ! colorize_check_requirements; then + return 1 + fi + + # If the environment variable ZSH_COLORIZE_STYLE + # is set, use that theme instead. Otherwise, + # use the default. + if [ -z "$ZSH_COLORIZE_STYLE" ]; then + # Both pygmentize & chroma support 'emacs' + ZSH_COLORIZE_STYLE="emacs" + fi + + # Use stdin if no arguments have been passed. if [ $# -eq 0 ]; then - pygmentize -g $@ + if [[ "$ZSH_COLORIZE_TOOL" == "pygmentize" ]]; then + pygmentize -O style="$ZSH_COLORIZE_STYLE" -g + else + chroma --style="$ZSH_COLORIZE_STYLE" + fi + return $? fi - for FNAME in $@ - do - filename=$(basename "$FNAME") - lexer=`pygmentize -N \"$filename\"` - if [ "Z$lexer" != "Ztext" ]; then - pygmentize -l $lexer "$FNAME" + # Guess lexer from file extension, or guess it from file contents if unsuccessful. + local FNAME lexer + for FNAME in "$@"; do + if [[ "$ZSH_COLORIZE_TOOL" == "pygmentize" ]]; then + lexer=$(pygmentize -N "$FNAME") + if [[ $lexer != text ]]; then + pygmentize -O style="$ZSH_COLORIZE_STYLE" -l "$lexer" "$FNAME" + else + pygmentize -O style="$ZSH_COLORIZE_STYLE" -g "$FNAME" + fi else - pygmentize -g "$FNAME" + chroma --style="$ZSH_COLORIZE_STYLE" "$FNAME" fi done } + +# The less option 'F - Forward forever; like "tail -f".' will not work in this implementation +# caused by the lack of the ability to follow the file within pygmentize. +colorize_less() { + if ! colorize_check_requirements; then + return 1 + fi + + _cless() { + # LESS="-R $LESS" enables raw ANSI colors, while maintain already set options. + local LESS="-R $LESS" + + # This variable tells less to pipe every file through the specified command + # (see the man page of less INPUT PREPROCESSOR). + # 'zsh -ic "colorize_cat %s 2> /dev/null"' would not work for huge files like + # the ~/.zsh_history. For such files the tty of the preprocessor will be supended. + # Therefore we must source this file to make colorize_cat available in the + # preprocessor without the interactive mode. + # `2>/dev/null` will suppress the error for large files 'broken pipe' of the python + # script pygmentize, which will show up if less has not fully "loaded the file" + # (e.g. when not scrolled to the bottom) while already the next file will be displayed. + local LESSOPEN="| zsh -c 'source \"$ZSH_COLORIZE_PLUGIN_PATH\"; \ + ZSH_COLORIZE_TOOL=$ZSH_COLORIZE_TOOL ZSH_COLORIZE_STYLE=$ZSH_COLORIZE_STYLE \ + colorize_cat %s 2> /dev/null'" + + # LESSCLOSE will be set to prevent any errors by executing a user script + # which assumes that his LESSOPEN has been executed. + local LESSCLOSE="" + + LESS="$LESS" LESSOPEN="$LESSOPEN" LESSCLOSE="$LESSCLOSE" less "$@" + } + + if [ -t 0 ]; then + _cless "$@" + else + # The input is not associated with a terminal, therefore colorize_cat will + # colorize this input and pass it to less. + # Less has now to decide what to use. If any files have been provided, less + # will ignore the input by default, otherwise the colorized input will be used. + # If files have been supplied and the input has been redirected, this will + # lead to unnecessary overhead, but retains the ability to use the less options + # without checking for them inside this script. + colorize_cat | _cless "$@" + fi +} |