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preview.sh
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preview.sh
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#!/usr/bin/env bash
#
# dynamic preview command for dotbare
# borrowed and modified from fzf.vim
#
# @params
# Globals
# reverse_seq: reverse highlight sequence for easier print
# reset_seq: reset highlight sequence for eaiser print
# input_option: the array containing informaiton from cmd argument
# preview_file: the file path to be previewed
# preview_center: the center/highlight line of the preview, if not set, display entire file
# preview_lines: total lines to be previed, used to determine the first line and last line to be printed
# preview_first: the first line number of the file to be printed
# preview_last: the last line number of the file to be printed
# file_mime: mime of the file, used to display information for binary file
# Arguments
# $1: The filename and line info to be previewed
# Format: filepath[:lineno][:ignored]
# Example
# preview "$HOME/.bashrc:15"
#######################################
# display the preview of the file
# construct argument for the action, execute and exit
# Arguments:
# $1: the file path to be previewed
# $2: the first line number to be previewd, optional
# $3: the center/highlight line in the preview, optional
# $4: the last line number to be previewed, optional
# Note:
# if the line number information such as $2 $3 $4 is not given, the entire
# file will be printed.
# Otherwise only the $2-$4 parts of the file will be printed and $3 will be highlighted
#######################################
function display_preview() {
local fallback_cmd preview_cmd preview_file preview_first preview_last preview_center
preview_file="$1"
preview_first="$2"
preview_center="$3"
preview_last="$4"
fallback_cmd="highlight -O ansi -l {} || coderay {} || rougify {} || cat {}"
preview_cmd=${DOTBARE_PREVIEW:-${fallback_cmd}}
preview_cmd=${preview_cmd//{\}/$(printf %q "${preview_file}")}
if [[ -z "${preview_first}" ]] || [[ -z "${preview_center}" ]] || [[ -z "${preview_last}" ]]; then
if [[ -z "${DOTBARE_PREVIEW}" ]] && command -v bat > /dev/null; then
bat --color=always --pager=never "${preview_file}"
exit $?
fi
eval "${preview_cmd}" 2> /dev/null
exit 0
else
if [ -z "${DOTBARE_PREVIEW}" ] && command -v bat > /dev/null; then
bat --color=always --pager=never \
--line-range="${preview_first}":"${preview_last}" --highlight-line="${preview_center}" "${preview_file}"
exit $?
fi
eval "${preview_cmd}" 2> /dev/null \
| awk "NR >= ${preview_first} && NR <= ${preview_last} { \
if (NR == ${preview_center}) \
{ gsub(/\x1b[[0-9;]*m/, \"&${reverse_seq}\"); printf(\"${reverse_seq}%s\n${reset_seq}\", \$0); } \
else \
printf(\"${reset_seq}%s\n\", \$0); \
}"
exit 0
fi
}
reverse_seq="\x1b[7m"
reset_seq="\x1b[m"
IFS=':' read -r -a input_option <<< "$1"
preview_file=${input_option[0]}
preview_center=${input_option[1]}
# potential fix for windows? Although I don't think dotbare will be usable in windows yet
if [[ $1 =~ ^[A-Z]:\\ ]]; then
preview_file=$preview_file:${input_option[1]}
preview_center=${input_option[2]}
fi
preview_file="${preview_file/#\~\//$HOME/}"
if [ ! -r "${preview_file}" ]; then
echo "File not found ${preview_file}"
exit 1
fi
# if binary, display binary info and exit
file_mime=$(file --dereference --mime "${preview_file}")
[[ "${file_mime}" =~ binary ]] \
&& echo "${file_mime}" \
&& exit 0
# if no line number was given, just preview the entire file
[[ -z "${preview_center}" ]] && display_preview "${preview_file}"
# if invalid line number was given, just preview the entire file
[[ -n "${preview_center}" && ! "${preview_center}" =~ ^[0-9] ]] && display_preview "${preview_file}"
# get the size of the termianl window and determine the first line and last line
preview_center=${preview_center/[^0-9]*/}
if [ -n "${FZF_PREVIEW_LINES}" ]; then
preview_lines="${FZF_PREVIEW_LINES}"
else
if [ -r /dev/tty ]; then
preview_lines=$(stty size < /dev/tty | awk '{print $1}')
else
preview_lines=40
fi
fi
preview_first=$((preview_center-preview_lines/3))
preview_first=$((preview_first < 1 ? 1 : preview_first))
preview_last=$((preview_first+preview_lines-1))
display_preview "${preview_file}" "${preview_first}" "${preview_center}" "${preview_last}"