rootiest/fish-config
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b2dd199e2f0a1e8e5ef6c6cbcc0cbf17ca89064b
fish-config/functions/config_help.fish
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rootiest ba92267a80 feat(config_help): colorize --help output 
Section headers in bold blue, argument/flag names in yellow, command
examples in green, navigation keys in cyan, fallback chain numbers
dimmed. All reset to normal after each colored span.
2026-06-06 04:23:58 -04:00

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9.2 KiB
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# Copyright (C) 2026 Rootiest
# SPDX-License-Identifier: AGPL-3.0-or-later
# SYNOPSIS
# config_help [section]
# config_help --help
#
# DESCRIPTION
# Opens the offline fish shell configuration manual in the best available
# pager. Falls back through ov -> bat -> man -> less -> cat.
# If a section keyword is provided, the pager opens at the first heading
# that matches the keyword. Lookup order: docs/fish-config.index (exact
# keyword aliases), then a normalized heading scan as fallback.
# When opened with ov a sticky navigation hint is shown at the top of the
# screen. Pass --help or -h to print usage and navigation key reference.
#
# ARGUMENTS
# section Optional keyword to jump to a matching section heading
# --help Print usage and navigation reference, then exit
# -h Alias for --help
#
# RETURNS
# 0 Manual displayed (or --help printed)
# 1 Documentation file not found
#
# EXAMPLE
# config_help
# config_help keybindings
# config_help pkg
# config_help fish-deps
# config_help --help
function config_help --description 'Open the offline fish shell configuration manual'
# ── --help / -h ──────────────────────────────────────────────
if contains -- --help $argv; or contains -- -h $argv
set_color --bold
echo config_help
set_color normal
echo " — view the offline fish shell configuration manual"
echo ""
set_color --bold brblue
echo USAGE
set_color normal
echo " config_help "(set_color yellow)"[section]"(set_color normal)
echo " config_help "(set_color yellow)"--help"(set_color normal)
echo ""
set_color --bold brblue
echo ARGUMENTS
set_color normal
echo " "(set_color yellow)"section"(set_color normal)" Optional keyword to jump to a matching section heading."
echo " Searches docs/fish-config.index for aliases first, then"
echo " falls back to a normalized (case- and punctuation-insensitive)"
echo " scan of heading lines."
echo ""
set_color --bold brblue
echo EXAMPLES
set_color normal
echo " "(set_color green)"config_help"(set_color normal)" open at top"
echo " "(set_color green)"config_help keybindings"(set_color normal)" jump to Key Bindings section"
echo " "(set_color green)"config_help pkg"(set_color normal)" jump to the pkg function entry"
echo " "(set_color green)"config_help fish-deps"(set_color normal)" jump to fish-deps"
echo " "(set_color green)"config_help abbreviations"(set_color normal)" jump to Abbreviations section"
echo ""
set_color --bold brblue
echo "NAVIGATION (ov pager)"
set_color normal
echo " "(set_color cyan)"Space"(set_color normal)" next section"
echo " "(set_color cyan)"^"(set_color normal)" previous section"
echo " "(set_color cyan)"Alt+u"(set_color normal)" toggle section list sidebar"
echo " "(set_color cyan)"/"(set_color normal)" search forward"
echo " "(set_color cyan)"n"(set_color normal)" / "(set_color cyan)"N"(set_color normal)" next / previous search match"
echo " "(set_color cyan)"g"(set_color normal)" go to line number"
echo " "(set_color cyan)"q"(set_color normal)" quit"
echo ""
set_color --bold brblue
echo "PAGER FALLBACK CHAIN"
set_color normal
echo " "(set_color brblack)"1."(set_color normal)" ov + bat section nav + syntax highlighting "(set_color brblack)"(best)"(set_color normal)
echo " "(set_color brblack)"2."(set_color normal)" ov alone section nav, raw Markdown"
echo " "(set_color brblack)"3."(set_color normal)" bat alone syntax highlighting, use / to search"
echo " "(set_color brblack)"4."(set_color normal)" man -l pre-compiled man page (if available)"
echo " "(set_color brblack)"5."(set_color normal)" less plain text with line-jump"
echo " "(set_color brblack)"6."(set_color normal)" cat plain output"
return 0
end
set -l doc_file "$__fish_config_dir/docs/fish-config.md"
set -l idx_file "$__fish_config_dir/docs/fish-config.index"
set -l man_file "$__fish_config_dir/docs/fish-config.1"
if not test -f "$doc_file"
set_color red
echo "error: documentation not found at $doc_file" >&2
set_color normal
return 1
end
# ── Resolve section start line ───────────────────────────────
# 1. Look up keyword in fish-config.index (keyword → exact heading text).
# 2. Fall back to normalized scan of heading lines if not in index.
# 3. Resolve start_line via grep -F on the heading text (immune to line
# number drift — only breaks if the heading itself is renamed).
set -l start_line 1
if test -n "$argv[1]"
set -l norm_kw (string lower -- $argv[1] | string replace -ra '[^a-z0-9]' '')
set -l found_text ""
# ── Index lookup ─────────────────────────────────────────
if test -f "$idx_file"
while read -l idxline
string match -qr '^[[:space:]]*(#|$)' -- $idxline; and continue
set -l kv (string split -m 1 '=' -- $idxline)
test (count $kv) -lt 2; and continue
set -l k (string lower -- $kv[1] | string replace -ra '[^a-z0-9]' '')
if test "$k" = "$norm_kw"
set found_text $kv[2]
break
end
end <"$idx_file"
end
# ── Normalized scan fallback ─────────────────────────────
if test -z "$found_text"
for entry in (grep -n "^#" "$doc_file")
set -l parts (string split -m 1 ':' -- $entry)
set -l text $parts[2]
set -l norm_text (string lower -- $text | string replace -ra '[^a-z0-9]' '')
if string match -q "*$norm_kw*" $norm_text
set found_text $text
break
end
end
end
if test -n "$found_text"
set -l lnum (grep -Fn "$found_text" "$doc_file" | cut -d: -f1 | head -1)
if test -n "$lnum"
set start_line $lnum
end
else
set_color yellow
echo "note: no section matching '$argv[1]' — opening at top" >&2
set_color normal
end
end
# ── Navigation hint line ─────────────────────────────────────
# Prepended to the ov input stream and pinned via --header 1 so it
# remains visible at the top of the screen at all times.
set -l nav_hint \
" \033[2mNAVIGATION: [ Space=next section ^=prev Alt+u=sections /=search q=quit ]\033[0m"
# ── Viewer fallback chain ────────────────────────────────────
# When jumping to a section, slice the file from start_line so ov
# opens with that section at the top without needing --pattern.
# (--section-header pins delimiter lines as sticky headers, removing
# them from pattern-search scope — tail-slice sidesteps this entirely.)
if type -q ov; and type -q bat
set -l ov_args \
--header 1 \
--section-delimiter "^#" \
--section-header
if test $start_line -gt 1
begin
printf "$nav_hint\n"
bat --color=always --style=plain --language=markdown "$doc_file" \
| tail -n +$start_line
end | ov $ov_args
else
begin
printf "$nav_hint\n"
bat --color=always --style=plain --language=markdown "$doc_file"
end | ov $ov_args
end
# ov alone: section navigation on raw Markdown; no code highlighting.
else if type -q ov
set -l ov_args \
--header 1 \
--section-delimiter "^#" \
--section-header
if test $start_line -gt 1
begin
printf "$nav_hint\n"
tail -n +$start_line "$doc_file"
end | ov $ov_args
else
begin
printf "$nav_hint\n"
cat "$doc_file"
end | ov $ov_args
end
# bat alone: syntax highlighting with built-in paging; no line jump.
else if type -q bat
if test $start_line -gt 1
set_color brblack
echo "note: bat pager — use / to search for your section" >&2
set_color normal
end
bat --language=markdown --paging=always "$doc_file"
# Pre-compiled man page (generated by CI after merge).
else if test -f "$man_file"
man -l "$man_file"
else if type -q less
less +"$start_line" "$doc_file"
else
cat "$doc_file"
end
end
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