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