jonaskruckenberg.de
Next Generation WASM Microkernel Operating System
1#!/usr/bin/env bash
2# utility functions used in other shell scripts.
3#
4# currently, this includes:
5# - cargo-style stderr logging (`err`, `note`, and `status` functions)
6# - confirmation prompts (`confirm` function)
7set -euo pipefail
8
9# Log an error to stderr
10#
11# Args:
12# $1: message to log
13err() {
14 echo -e "\e[31m\e[1merror:\e[0m" "$@" 1>&2;
15}
16
17# Log a note to stderr
18#
19# Args:
20# $1: message to log
21note() {
22 echo -e "\e[31m\e[1mnote:\e[0m" "$@" 1>&2;
23}
24
25# Log a cargo-style status message to stderr
26#
27# Args:
28# $1: a "tag" for the log message (should be 12 characters or less in
29# length)
30# $2: message to log
31status() {
32 local width=12
33 local tag="$1"
34 local msg="$2"
35 printf "\e[32m\e[1m%${width}s\e[0m %s\n" "$tag" "$msg"
36}
37
38# Prompt the user to confirm an action
39#
40# Args:
41# $1: message to display to the user along with the `[y/N]` prompt
42#
43# Returns:
44# 0 if the user confirmed, 1 otherwise
45confirm() {
46 while read -r -p "$1 [Y/n] " input
47 do
48 case "$input" in
49 [yY][eE][sS]|[yY])
50 return 0
51 ;;
52 [nN][oO]|[nN])
53 return 1
54 ;;
55 *)
56 err "invalid input $input"
57 ;;
58 esac
59 done
60}
61
62# Returns the path to a Mycelium crate.
63#
64# Args:
65# $1: crate name
66#
67# Returns:
68# 0 if the crate exists, 0 if it does not exist.
69crate_path() {
70 local crate="$1"
71 local mycoprefix='mycelium-';
72 if [[ -d $crate ]]; then
73 echo "$crate"
74 elif [[ -d "${crate#"$mycoprefix"}" ]]; then
75 echo "${crate#"$mycoprefix"}"
76 else
77 err "unknown crate $crate"
78 return 1;
79 fi
80}