Commit | Line | Data |
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6902250a SBS |
1 | #!/usr/bin/env bash |
2 | # Desc: Insert string into provided string | |
3 | ||
b29fc43b | 4 | yell() { echo "$0: $*" >&2; } |
6902250a SBS |
5 | die() { yell "$*"; exit 111; } |
6 | must() { "$@" || die "cannot $*"; } | |
6902250a | 7 | insertStr() { |
b29fc43b | 8 | # Desc: Inserts a string into another string at a specified position. |
6902250a SBS |
9 | # Input: arg1: str str_rec String to receive insertion |
10 | # arg2: int pos Insertion position (0 = append to front) | |
11 | # arg3: str str_ins String to be inserted | |
12 | # Output: stdout: Combined string | |
b29fc43b | 13 | # Version: 0.0.2 |
6902250a SBS |
14 | # Depends: BK-2020-03: yell(), die(), must() |
15 | # Ref/Attrib: * BK-2020-03: https://gitlab.com/baltakatei/baltakatei-exdev/ | |
b29fc43b SBS |
16 | # * Cooper, Mendel. “Advanced Bash-Scripting Guide: Manipulating Strings”. tldp.org https://tldp.org/LDP/abs/html/string-manipulation.html |
17 | ||
18 | local str_rec pos str_ins re len_str_rec; | |
19 | local pfx_pos_start pfx_len pfx; | |
20 | local sfx_pos_start sfx_len sfx; | |
6902250a SBS |
21 | |
22 | # Check args | |
23 | if [[ $# -ne 3 ]]; then | |
24 | yell "ERROR:Invalid argument count:$#"; | |
25 | return 1; fi; | |
26 | re='^[0-9]+$'; | |
27 | if [[ ! "$2" =~ $re ]]; then | |
28 | yell "ERROR:Not an int:$2"; | |
29 | return 1; fi; | |
30 | str_rec="$1"; | |
31 | pos="$2"; | |
32 | str_ins="$3"; | |
33 | ||
34 | # Calculate string stats | |
35 | len_str_rec="${#str_rec}"; | |
6902250a SBS |
36 | |
37 | # Form prefix | |
38 | pfx_pos_start="0"; | |
39 | pfx_len="$pos"; | |
40 | pfx="${str_rec:$pfx_pos_start:$pfx_len}"; | |
41 | ||
42 | # Form suffix | |
43 | sfx_pos_start="$(( pos ))"; | |
44 | sfx_len="$(( len_str_rec - pos ))"; | |
45 | sfx="${str_rec:$sfx_pos_start:$sfx_len}"; | |
46 | ||
47 | # Print output to stdout | |
b29fc43b | 48 | printf "%s%s%s\n" "$pfx" "$str_ins" "$sfx"; |
6902250a SBS |
49 | }; # Insert string provided at indicated position via stdout |
50 | ||
51 | ||
52 | # Tests | |
53 | printf "\"%s\" should read \"foobarbaz\"\n" "$(insertStr "foobaz" 3 "bar";)"; | |
54 | ||
55 | insertStr "foobaz" 0 "bar"; | |
56 | insertStr "foobaz" 1 "bar"; | |
57 | insertStr "foobaz" 2 "bar"; | |
58 | insertStr "foobaz" 3 "bar"; | |
59 | insertStr "foobaz" 4 "bar"; | |
60 | insertStr "foobaz" 5 "bar"; | |
61 | insertStr "foobaz" 6 "bar"; | |
62 | insertStr "foobaz" 7 "bar"; | |
63 | insertStr "foobaz" 999 "bar"; |