dotfiles/home/.local/bin/scripts/cheat.sh

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#!/bin/sh
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# rm_trailing_slashes(string)
#
# Prints a string without any trailing slashes.
# This is used because cheat.sh doesn't play nicely with multiple slashes in
# URLs.
rm_trailing_slashes() {
string="$1"
last_char="$(printf "$string" | tail -c 1)"
if [ "$last_char" = "/" ]; then
echo "$(rm_trailing_slashes "${string%?}")"
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else
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echo "$string"
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fi
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}
# pick_category(must_match, query, argument, recurse)
#
# Pick cheat.sh category.
# if must_match is 1, only allow listed options to be picked.
# if query is specified, pick sub-category of it, else pick global categories.
# if argument is specified, optionally perform must_match check and print it.
# if recurse is 1, if the selected option ends with /, run the function again.
#
# Prints the chosen category
pick_category() {
must_match="$1"
query="$(rm_trailing_slashes "$2")"
argument="$3"
recurse="$4"
# Query all possible options
if [ -n "$query" ]; then
url="cheat.sh/$query/:list"
else
url="cheat.sh/:list"
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fi
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selectable="$(curl -s "$url")"
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# If argument is specified, print it, optionally perform must_match check.
if [ -n "$argument" ]; then
if [ "$must_match" -ne 1 ] || echo "$selectable" | grep -qe "\b$1\b"; then
selected="$argument"
else
echo "Invalid selection: '$argument'"
echo "For all selections, query $url"
exit 1
fi
# Select the option with fzf, optionally allow other matches if must_match isn't set.
else
if [ "$must_match" -ne 1 ]; then
if [ -z "$selectable" ]; then
header="No selections found, you can use empty query to show category help, or type a custom query."
else
header="Use alt-enter to enter non-listed query. You can use empty queries to show category help."
fi
selected="$(printf "\n$selectable" | \
fzf --bind=alt-enter:print-query \
--print-query \
--prompt="cheat.sh/$query query>" \
--header="$header"\
)"
else
selected=$(printf "$selectable" | fzf --prompt="cheat.sh/$query category>")
if [ $? -ne 0 ]; then
echo "Invalid selection: '$selected'"
echo "For all selections, query $url"
exit 1
fi
fi
selected=$(printf "$selected" | tail -1)
fi
# Replace spaces with '+' (cheat.sh resolves those as spaces)
selected="$(echo "$selected" | tr ' ' '+')"
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# Prepend the original query, if we have one
# Print the selected category, or subcategory with the category
if [ -n "$query" ]; then
result="$query/$selected"
else
result="$selected"
fi
# Recurse, if specified and the result ended with /
if [ "$recurse" -eq 1 ]; then
if [ "$(printf "$selected" | tail -c 1)" = "/" ]; then
result="$(pick_category "$must_match" "$result" "$argument" 1)"
fi
fi
# Print the result
printf "$result"
}
# Select the cheatsheat category (language/core-util/...)
query=$(pick_category 1 "" "$1" 0)
# If the query isn't already complete, select a sub-category
if ! echo "$query" | grep -qe ":"; then
query="$(pick_category 0 "$query" "$2" 1)"
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fi
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# Construct the URL from given query and print it
url="cheat.sh/$query"
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echo "$url"
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# Show the output of cheat.sh request
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curl -s "$url"