115 lines
4.4 KiB
Bash
115 lines
4.4 KiB
Bash
# Easier alias to use the plugin
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alias ccat="colorize_cat"
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alias cless="colorize_less"
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# '$0:A' gets the absolute path of this file
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ZSH_COLORIZE_PLUGIN_PATH=$0:A
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colorize_check_requirements() {
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local -a available_tools
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available_tools=("chroma" "pygmentize")
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if [ -z "$ZSH_COLORIZE_TOOL" ]; then
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if (( $+commands[pygmentize] )); then
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ZSH_COLORIZE_TOOL="pygmentize"
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elif (( $+commands[chroma] )); then
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ZSH_COLORIZE_TOOL="chroma"
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else
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echo "Neither 'pygments' nor 'chroma' is installed!" >&2
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return 1
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fi
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fi
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if [[ ${available_tools[(Ie)$ZSH_COLORIZE_TOOL]} -eq 0 ]]; then
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echo "ZSH_COLORIZE_TOOL '$ZSH_COLORIZE_TOOL' not recognized. Available options are 'pygmentize' and 'chroma'." >&2
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return 1
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elif ! (( $+commands[$ZSH_COLORIZE_TOOL] )); then
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echo "Package '$ZSH_COLORIZE_TOOL' is not installed!" >&2
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return 1
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fi
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}
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colorize_cat() {
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if ! colorize_check_requirements; then
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return 1
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fi
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# If the environment variable ZSH_COLORIZE_STYLE
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# is set, use that theme instead. Otherwise,
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# use the default.
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if [ -z "$ZSH_COLORIZE_STYLE" ]; then
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# Both pygmentize & chroma support 'emacs'
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ZSH_COLORIZE_STYLE="emacs"
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fi
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# Use stdin if no arguments have been passed.
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if [ $# -eq 0 ]; then
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if [[ "$ZSH_COLORIZE_TOOL" == "pygmentize" ]]; then
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pygmentize -O style="$ZSH_COLORIZE_STYLE" -g
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else
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chroma --style="$ZSH_COLORIZE_STYLE" --formatter="${ZSH_COLORIZE_CHROMA_FORMATTER:-terminal}"
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fi
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return $?
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fi
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# Guess lexer from file extension, or guess it from file contents if unsuccessful.
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local FNAME lexer
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for FNAME in "$@"; do
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if [[ "$ZSH_COLORIZE_TOOL" == "pygmentize" ]]; then
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lexer=$(pygmentize -N "$FNAME")
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if [[ $lexer != text ]]; then
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pygmentize -O style="$ZSH_COLORIZE_STYLE" -l "$lexer" "$FNAME"
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else
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pygmentize -O style="$ZSH_COLORIZE_STYLE" -g "$FNAME"
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fi
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else
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chroma --style="$ZSH_COLORIZE_STYLE" --formatter="${ZSH_COLORIZE_CHROMA_FORMATTER:-terminal}" "$FNAME"
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fi
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done
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}
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# The less option 'F - Forward forever; like "tail -f".' will not work in this implementation
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# caused by the lack of the ability to follow the file within pygmentize.
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colorize_less() {
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if ! colorize_check_requirements; then
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return 1
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fi
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_cless() {
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# LESS="-R $LESS" enables raw ANSI colors, while maintain already set options.
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local LESS="-R $LESS"
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# This variable tells less to pipe every file through the specified command
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# (see the man page of less INPUT PREPROCESSOR).
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# 'zsh -ic "colorize_cat %s 2> /dev/null"' would not work for huge files like
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# the ~/.zsh_history. For such files the tty of the preprocessor will be suspended.
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# Therefore we must source this file to make colorize_cat available in the
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# preprocessor without the interactive mode.
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# `2>/dev/null` will suppress the error for large files 'broken pipe' of the python
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# script pygmentize, which will show up if less has not fully "loaded the file"
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# (e.g. when not scrolled to the bottom) while already the next file will be displayed.
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local LESSOPEN="| zsh -c 'source \"$ZSH_COLORIZE_PLUGIN_PATH\"; \
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ZSH_COLORIZE_TOOL=$ZSH_COLORIZE_TOOL ZSH_COLORIZE_STYLE=$ZSH_COLORIZE_STYLE \
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colorize_cat %s 2> /dev/null'"
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# LESSCLOSE will be set to prevent any errors by executing a user script
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# which assumes that his LESSOPEN has been executed.
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local LESSCLOSE=""
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LESS="$LESS" LESSOPEN="$LESSOPEN" LESSCLOSE="$LESSCLOSE" command less "$@"
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}
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if [ -t 0 ]; then
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_cless "$@"
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else
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# The input is not associated with a terminal, therefore colorize_cat will
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# colorize this input and pass it to less.
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# Less has now to decide what to use. If any files have been provided, less
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# will ignore the input by default, otherwise the colorized input will be used.
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# If files have been supplied and the input has been redirected, this will
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# lead to unnecessary overhead, but retains the ability to use the less options
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# without checking for them inside this script.
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colorize_cat | _cless "$@"
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fi
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}
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