Autogenerate dependency table

Makefile

@@ -14,7 +14,7 @@ LIBS := magic crypto
 CFLAGS  += $(O) -MD -Wall -Wextra -Wno-unused-parameter
 LDFLAGS += $(LIBS:%=-l%)
 
-all: ctpv
+all: ctpv README.md doc/ctpv.1
 
 options:
 	@echo "CC      = $(CC)"
@@ -58,6 +58,12 @@ gen/helpers.h: helpers.sh embed/embed
 	@mkdir -p $(@D)
 	embed/embed -p scr_ helpers.sh > $@
 
+README.md: $(PRE)
+	./deplist.awk $^ | ./deplist.md.sh | ./deplistadd.sh $@
+
+doc/ctpv.1: $(PRE)
+	./deplist.awk $^ | ./deplist.1.sh | ./deplistadd.sh $@
+
 embed/embed: make_embed
 	@ # do nothing
 

README.md

@@ -23,22 +23,29 @@ external programs like lf does.
 
 ## Dependencies
 
-These programs are needed to make specific previews work.
-If a preview requires some program and it's not found on the system,
-`ctpv` will fallback to other previews.
+All the previews require specific programs to function.
+If a required program is not found on the system, ctpv
+will try to use another preview.
 
-| File types | Required programs |
+<!-- This table is auto generated! -->
+<!--TABLESTART-->
+| File types | Programs |
 | ---- | ---- |
-| Text files | `source-highlight` `highlight` |
-| Image files | `ueberzug` |
-| Videos | `ffmpegthumbnailer` |
-| Diff files | `colordiff` `delta` `diff-so-fancy` |
-| Markdown | `mdcat` |
-| JSON files | `jq` |
-| PDF files | `pdftoppm` |
-| Torrent files | `transmission-show` |
-| HTML files | `w3m` `lynx` `elinks` |
-| Any other files | `exiftool` |
+| any | `exiftool` `cat` |
+| archive | `atool` |
+| diff | `colordiff` `delta` `diff-so-fancy` |
+| directory | `ls` |
+| html | `elinks` `lynx` `w3m` |
+| image | `ueberzug` |
+| json | `jq` |
+| libreoffice | `libreoffice` |
+| markdown | `mdcat` |
+| pdf | `pdftoppm` |
+| text | `bat` `cat` `highlight` `source-highlight` |
+| torrent | `transmission-show` |
+| video | `ffmpegthumbnailer` |
+
+<!--TABLEEND-->
 
 ## Installation
 

deplist.1.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+echo '.TS'
+echo 'allbox;'
+echo 'lb lb'
+echo 'l li .'
+
+printf '%s\t%s\n' 'File type' 'Programs'
+sort | sed 's/\t/&T{\n/; s/$/\nT}/'
+
+echo '.TE'

deplist.awk

@@ -0,0 +1,43 @@
+#!/usr/bin/gawk -f
+
+function perr(str) {
+    printf "%s: %s\n", ARGV[0], str > "/dev/stderr"
+}
+
+function join(arr, sep,   res, s) {
+    for (i in arr) {
+        res = res s arr[i]
+        if (s == "")
+            s = sep
+    }
+
+    return res
+}
+
+function process_file(file,   i, line, arr, t, p, p_len) {
+    i = getline line < file
+
+    if (i == -1) {
+        perr(ERRNO ": " file)
+        exit
+    } else if (i == 0) {
+        return
+    }
+
+    if (match(line, /^#\s*(\w+):\s*(.*)/, arr) == 0)
+        return
+
+    t = arr[1]
+    p_len = split(arr[2], p, /\s+/)
+    for (i = 1; i <= p_len; i++)
+        types[t][types_len[t]++] = p[i]
+}
+
+BEGIN {
+    for (i = 1; i < ARGC; i++)
+        process_file(ARGV[i])
+
+    for (t in types) {
+        printf "%s\t%s\n", t, join(types[t], " ")
+    }
+}

deplist.md.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+echo "| File types | Programs |"
+echo "| ---- | ---- |"
+
+sort | sed 's/ /` `/g; s/^/| /; s/\t/ | `/; s/$/` |/'
+echo

deplistadd.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+table="$(mktemp XXXXXX)"
+trap 'rm "$table"' EXIT
+
+cat > "$table"
+
+sed -i "
+	/TABLESTART/,/TABLEEND/ {
+		/TABLESTART/ {
+			r $table
+			b
+		}
+		/TABLEEND/!d
+	}
+" "$1"

doc/ctpv.1

@@ -1,3 +1,4 @@
+'\" t
 .ds op \&.\|.\|.\&
 .
 .de Sy
@@ -76,6 +77,61 @@ is given a file, it determines an appropriate preview for it and
 runs its script.
 The script produces preview content and prints it to standard output.
 .
+.SS Dependencies
+.
+All the previews require specific programs to function.
+If a required program is not found on the system,
+.B ctpv
+will try to use another preview.
+\# This table is auto generated!
+\# TABLESTART
+.TS
+allbox;
+lb lb
+l li .
+File type	Programs
+any	T{
+exiftool cat
+T}
+archive	T{
+atool
+T}
+diff	T{
+colordiff delta diff-so-fancy
+T}
+directory	T{
+ls
+T}
+html	T{
+elinks lynx w3m
+T}
+image	T{
+ueberzug
+T}
+json	T{
+jq
+T}
+libreoffice	T{
+libreoffice
+T}
+markdown	T{
+mdcat
+T}
+pdf	T{
+pdftoppm
+T}
+text	T{
+bat cat highlight source-highlight
+T}
+torrent	T{
+transmission-show
+T}
+video	T{
+ffmpegthumbnailer
+T}
+.TE
+\# TABLEEND
+.
 .SS Integration
 .
 .TP

prev/any.sh

@@ -1,3 +1,5 @@
+# any: exiftool cat
+
 if exists exiftool; then
 	exiftool -- "$f" || true
 else

prev/atool.sh

@@ -1 +1,3 @@
+# archive: atool
+
 atool -l -- "$f"

prev/bat.sh

@@ -1,3 +1,5 @@
+# text: bat
+
 if exists bat; then
 	batcmd=bat
 elif exists batcat; then

prev/cat.sh

@@ -1 +1,3 @@
+# text: cat
+
 cat < "$f"

prev/colordiff.sh

@@ -1 +1,3 @@
+# diff: colordiff
+
 colordiff < "$f"

prev/delta.sh

@@ -1 +1,3 @@
+# diff: delta
+
 delta < "$f"

prev/diff_so_fancy.sh

@@ -1 +1,3 @@
+# diff: diff-so-fancy
+
 diff-so-fancy < "$f"

prev/elinks.sh

@@ -1,3 +1,5 @@
+# html: elinks
+
 elinks                       \
 	-dump 1 -dump-width "$w" \
 	-no-references -no-numbering < "$f"

prev/highlight.sh

@@ -1,3 +1,5 @@
+# text: highlight
+
 highlight \
 	--replace-tabs=4 --out-format=ansi \
 	--style='pablo' --force -- "$f"

prev/jq.sh

@@ -1 +1,3 @@
+# json: jq
+
 jq -C . < "$f"

prev/ls.sh

@@ -1 +1,3 @@
+# directory: ls
+
 ls --color --group-directories-first -- "$f"

prev/lynx.sh

@@ -1 +1,3 @@
+# html: lynx
+
 lynx -dump -nonumbers -nolist -width="$w" -- "$f"

prev/mdcat.sh

@@ -1 +1,3 @@
+# markdown: mdcat
+
 mdcat --columns "$w" -- "$f"

prev/odt.sh

@@ -1,4 +1,4 @@
-# libreoffice
+# libreoffice: libreoffice
 
 office() {
 	# File produced by libreoffice

prev/pdf.sh

@@ -1,3 +1,5 @@
+# pdf: pdftoppm
+
 pdf() {
 	pdftoppm -f 1 -l 1              \
 		-scale-to-x 1920            \

prev/source_highlight.sh

@@ -1,3 +1,5 @@
+# text: source-highlight
+
 source-highlight                       \
 	--tab=4 --out-format=esc           \
 	--style=esc256.style --failsafe -i \

prev/torrent.sh

@@ -1 +1,3 @@
+# torrent: transmission-show
+
 transmission-show -- "$f"

prev/ueberzug.sh

@@ -1,3 +1,5 @@
+# image: ueberzug
+
 setup_fifo
 
 send_image "$f"

prev/video.sh

@@ -1,3 +1,5 @@
+# video: ffmpegthumbnailer
+
 video() {
 	ffmpegthumbnailer -i "$f" -o "$cache_f" -s 0 -t 50% 2>/dev/null
 }

prev/w3m.sh

@@ -1 +1,3 @@
+# html: w3m
+
 w3m -dump "$f"