n-preview
6361 bytes
1# Copy this file into /usr/share/zsh/site-functions/
2# and add 'autoload n-preview` to .zshrc
3#
4# This is partially a test if n-list-draw and n-list-input can be
5# used multiple times to create multiple lists. It might become
6# more usable if someone adds more features like previewing of
7# archive contents.
8
9emulate -L zsh
10
11zmodload zsh/curses
12
13setopt typesetsilent extendedglob
14trap "return" TERM INT QUIT
15trap "_vpreview_exit" EXIT
16
17local IFS="
18"
19
20[ -f ~/.config/znt/n-list.conf ] && . ~/.config/znt/n-list.conf
21
22[[ "$colorpair" = "" ]] && colorpair="white/black"
23local background="${colorpair#*/}"
24
25# Drawing and input
26autoload n-list-draw n-list-input
27
28# Cleanup before any exit
29_vpreview_exit() {
30 zcurses 2>/dev/null delwin files
31 zcurses 2>/dev/null delwin body
32 zcurses 2>/dev/null delwin status
33 zcurses 2>/dev/null refresh
34 zcurses end
35}
36
37# Outputs a message in the bottom of the screen
38_vpreview_status_msg() {
39 zcurses move status 1 2
40 zcurses clear status eol
41 zcurses string status "$1"
42}
43
44# Prefer tput, then module terminfo
45_nlist_cursor_visibility() {
46 if type tput 2>/dev/null 1>&2; then
47 [ "$1" = "1" ] && tput cvvis
48 [ "$1" = "0" ] && tput civis
49 elif [ "$has_termcap" = "1" ]; then
50 [ "$1" = "1" ] && [ -n $terminfo[cvvis] ] && echo -n $terminfo[cvvis]
51 [ "$1" = "0" ] && [ -n $terminfo[civis] ] && echo -n $terminfo[civis]
52 fi
53}
54
55#
56# Main code
57#
58
59integer term_height="$LINES"
60integer term_width="$COLUMNS"
61if [[ "$term_height" -lt 1 || "$term_width" -lt 1 ]]; then
62 local stty_out=$( stty size )
63 term_height="${stty_out% *}"
64 term_width="${stty_out#* }"
65fi
66
67integer status_height=3
68integer status_width=term_width
69integer status_page_height=1
70integer status_page_width=term_width-2
71
72integer files_height=term_height-status_height
73integer files_width=term_width/5
74integer files_page_height=files_height-2
75integer files_page_width=files_width-2
76
77integer body_height=term_height-status_height
78integer body_width=term_width-files_width
79integer body_page_height=body_height-2
80integer body_page_width=body_width
81
82integer _from_what_idx_list_is_shown_1=1
83integer current_1=1
84
85integer _from_what_idx_list_is_shown_2=1
86integer current_2=1
87integer hscroll_2=0
88
89integer active_window=0
90
91local ansi_mode="ansi"
92[ -f ~/.config/znt/n-preview.conf ] && . ~/.config/znt/n-preview.conf
93typeset -a hcmd
94#if type pygmentize 2>/dev/null 1>&2; then
95# hcmd=( pygmentize -g )
96if type highlight 2>/dev/null 1>&2; then
97 hcmd=( highlight -q --force -O ansi )
98elif type source-highlight 2>/dev/null 1>&2; then
99 # Warning: source-highlight can have problems
100 hcmd=( source-highlight --failsafe -fesc -o STDOUT -i )
101else
102 ansi_mode="noansi"
103fi
104
105zcurses init
106zcurses addwin status "$status_height" "$status_width" $(( term_height - status_height )) 0
107zcurses addwin files "$files_height" "$files_width" 0 0
108zcurses addwin body "$body_height" "$body_width" 0 "$files_width"
109zcurses bg status white/black
110zcurses bg files white/black
111zcurses bg body white/black
112
113#
114# Listening for input
115#
116
117local key keypad
118
119# Clear input buffer
120zcurses timeout status 0
121zcurses input status key keypad
122zcurses timeout status -1
123key=""
124keypad=""
125
126typeset -a filenames
127integer last_element_1
128
129typeset -a body
130integer last_element_2
131
132filenames=( *(N) )
133filenames=( "${(@M)filenames:#(#i)*$1*}" )
134
135local NLIST_GREP_STRING="$1"
136
137integer last_element_1="$#filenames"
138integer last_element_2=0
139
140local selection action final_key
141
142while (( 1 )); do
143 # Output the lists
144 integer end_idx=$(( _from_what_idx_list_is_shown_1 + files_page_height - 1 ))
145 [ "$end_idx" -gt "$last_element_1" ] && end_idx=last_element_1
146
147 n-list-draw "$(( (current_1 -1) % files_page_height + 1 ))" \
148 "$files_page_height" "$files_page_width" 1 2 0 files \
149 "${(@)filenames[_from_what_idx_list_is_shown_1, end_idx]}"
150
151 if [ "$#body" -ge 1 ]; then
152 end_idx=$(( _from_what_idx_list_is_shown_2 + body_page_height - 1 ))
153 [ "$end_idx" -gt "$last_element_2" ] && end_idx=last_element_2
154
155 n-list-draw "$(( (current_2 -1) % body_page_height + 1 ))" \
156 "$body_page_height" "$body_page_width" 1 0 "$hscroll_2" body \
157 "${(@)body[_from_what_idx_list_is_shown_2, end_idx]}"
158 fi
159
160 [[ "$active_window" -eq 0 ]] && zcurses border files
161 zcurses border status
162 zcurses refresh files body status
163
164 # Wait for input
165 zcurses input status key keypad
166
167 # Get the special (i.e. "keypad") key or regular key
168 if [ -n "$key" ]; then
169 final_key="$key"
170 elif [ -n "$keypad" ]; then
171 final_key="$keypad"
172 else
173 _vpreview_status_msg "Improper input detected"
174 zcurses refresh status
175 fi
176
177 if [ "$active_window" -eq 0 ]; then
178 zcurses clear files
179 n-list-input "$current_1" "$_from_what_idx_list_is_shown_1" "$files_page_height" \
180 "$files_page_width" "$last_element_1" 0 "$final_key"
181
182 selection="$reply[1]"
183 action="$reply[2]"
184 current_1="$reply[3]"
185 _from_what_idx_list_is_shown_1="$reply[4]"
186
187 if [ "$action" = "SELECT" ]; then
188 # Load new file and refresh the displaying window
189 local filename="$filenames[$selection]"
190 if [ "$ansi_mode" = "ansi" ]; then
191 body=( "${(@f)"$( "$hcmd[@]" "$filename" )"}" )
192 else
193 body=( "${(@f)"$(<$filename)"}" )
194 fi
195 last_element_2="$#body"
196 current_2=1
197 _from_what_idx_list_is_shown_2=1
198 zcurses clear body
199 fi
200 elif [ "$active_window" -eq 1 ]; then
201 zcurses clear body
202 n-list-input "$current_2" "$_from_what_idx_list_is_shown_2" "$body_page_height" \
203 "$body_page_width" "$last_element_2" "$hscroll_2" "$final_key"
204
205 selection="$reply[1]"
206 action="$reply[2]"
207 current_2="$reply[3]"
208 _from_what_idx_list_is_shown_2="$reply[4]"
209 hscroll_2="$reply[5]"
210
211 fi
212
213 if [ "$action" = "LEAVE" ]; then
214 active_window=1-active_window
215 elif [ "$action" = "QUIT" ]; then
216 break
217 elif [ "$action" = "REDRAW" ]; then
218 zcurses clear files redraw
219 zcurses clear body redraw
220 zcurses clear status redraw
221 fi
222done
223
224# vim: set filetype=zsh: