config_parser.sh provides functions to support parsing simple config
files, pacman.conf in particular. Our scripts should never use a
simple eval to get config values such as DBPath.
conf_key_val() is modified from pacman-key's get_from() function. Please
note conf_key_val() and conf_key_set() both read config file from stdin,
instead of $1.
Signed-off-by: lolilolicon
---
scripts/library/README | 3 ++
scripts/library/config_parser.sh | 56 ++++++++++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+), 0 deletions(-)
create mode 100644 scripts/library/config_parser.sh
diff --git a/scripts/library/README b/scripts/library/README
index 1e9c962..4fb70dd 100644
--- a/scripts/library/README
+++ b/scripts/library/README
@@ -1,6 +1,9 @@
This folder contains code snippets that can be reused by multiple
scripts. A brief description of each file follows.
+config_parser.sh:
+Parses simple config files such as pacman.conf.
+
output_format.sh:
Provides basic output formatting functions with levels 'msg', 'msg2',
'warning' and 'error'. The 'msg' amd 'msg2' functions print to stdout
diff --git a/scripts/library/config_parser.sh b/scripts/library/config_parser.sh
new file mode 100644
index 0000000..1d125eb
--- /dev/null
+++ b/scripts/library/config_parser.sh
@@ -0,0 +1,56 @@
+shopt -s extglob
+
+# Parse value of a non-repeating key from a config file.
+#
+# stdin: config file
+# $1: key - shall not contain '=', or start/end with whitespaces
+# $2: default value if not defined in config file [optional]
+# return:
+# 0 - print value of key
+# 1 - print nothing
+conf_key_val() {
+ local key val
+ while IFS='=' read -r key val; do
+ # strip whitespaces
+ key=${key##*([[:space:]])}
+ key=${key%%*([[:space:]])}
+ val=${val##*([[:space:]])}
+ val=${val%%*([[:space:]])}
+ # ignore comments and invalid lines
+ [[ ${key:0:1} == '#' || -z $key || -z $val ]] && continue
+ # return success as soon as a value is found
+ if [[ $key == "$1" ]]; then
+ printf '%s' "$val"
+ return 0
+ fi
+ done
+ # fallback to default value if specified
+ if [[ -n $2 ]]; then
+ printf '%s' "$2"
+ return 0
+ fi
+ return 1
+}
+
+# Check whether an on/off key is set (on) in a config file.
+#
+# stdin: config file
+# $1: key - shall not contain '=', or start/end with whitespaces
+# return:
+# 0 - key is set
+# 1 - key is not set
+conf_key_set() {
+ local key
+ while read -r key; do
+ # strip whitespaces, ignore comments
+ key=${key##*([[:space:]])}
+ key=${key%%*([[:space:]])}
+ # ignore comments and invalid lines
+ [[ ${key:0:1} == '#' || -z $key ]] && continue
+ # return success as soon as the key is found
+ if [[ $key == "$1" ]]; then
+ return 0
+ fi
+ done
+ return 1
+}
--
1.7.6.4