X-Git-Url: https://ruderich.org/simon/gitweb/?p=config%2Fdotfiles.git;a=blobdiff_plain;f=lib.sh;h=e9fd56dbed9facaa46da77390a738d922989db4a;hp=9e2308d6adf988de977116d7b28713e52c077fce;hb=732dfd2898effb21d6dd341c7d5b65962556fa1d;hpb=f30437901deddf4e539294eaddcd2f19af1d778b diff --git a/lib.sh b/lib.sh index 9e2308d..e9fd56d 100644 --- a/lib.sh +++ b/lib.sh @@ -7,9 +7,6 @@ # options supported by zsh or GNU ls. unset LS_COLORS -# Get path to m4 because it's later redefined as function. -m4=`which m4` - # Check if the given program is installed. Returns 0 if it exists, 1 # otherwise; so it can be used in if. @@ -72,35 +69,66 @@ link() { unset pwd base source target } -# m4 wrapper which uses $1.m4 as template file, feeds it to m4 and writes it -# to $1 with a warning at the beginning to not edit the generated file. +# Write a warning to $1 to make clear it should not be modified. $2 is the +# source for the generated file. Also print a message to stdout that the file +# $1 was generated from $2 using the command $3 with options $4. +warning() { + echo "###################################" > $1 + echo "# WARNING! DO NOT EDIT THIS FILE! #" >> $1 + echo "###################################" >> $1 + echo >> $1 + echo "# It was generated from $2 on `date`." >> $1 + echo >> $1 + + # Display given options if there were any (zsh has a problem with $options + # as variable name). + option= + if [ -n "$4" ]; then + option=" with options '$4'" + fi + # Write message to stdout. + echo "$3: generating '$1' from '$2'$option" + + unset option +} + +# Generate a file using several methods. A warning not to edit it is +# automatically added to the created file and a message printed to stdout +# through warning(). # -# All arguments (except the first which is the filename) are passed to m4. +# The following commands are possible; the file extension for the source file +# in brackets. # -# The following macros are defined: IF and FI. Example: -# IF(OS, debian) -# ... -# FI -m4() { - # First argument is file name. - file=$1 +# - m4 (.m4): pipe $2.m4 through m4 then write it to $2 +# - awk (.in): pipe $2.in through awk then write it to $2 +# - cat ($3): copy $2$3 to $2 +generate() { + # Get command and target file. + command="$1" + file="$2" + # Remove arguments from list. + shift shift - # Write a warning to the generated file. - echo "###################################" > $file - echo "# WARNING! DO NOT EDIT THIS FILE! #" >> $file - echo "###################################" >> $file - echo >> $file - echo "# It was generated from $file.m4 on `date`." >> $file - echo >> $file - - # Process $1.m4 with m4 using the given options. - echo "m4(): generating '$file' from '$file.m4' with options '$*'" - # Add useful macros. - (echo "define(\`IF', \`ifelse(\`\$1', \`\$2',dnl')dnl -define(\`FI', \`)dnl')dnl"; - # Run the file (and the default macros) through m4. - cat $file.m4) | $m4 "$@" >> $file - - unset file + # Set extension for the used commands. When cat is used $3 is used as + # extension. + if [ x"$command" = xm4 ]; then + extension=.m4 + elif [ x"$command" = xawk ]; then + extension=.in + elif [ x"$command" = xcat ]; then + extension="$1" # is $3 in reality, $1 because of shifting + shift + # Print a warning and exit if an unsupported command is used. + else + echo "generate(): command '$command' not supported!" >&2 + exit 1 + fi + + # Add warning to file and write a message to stdout. + warning "$file" "$file$extension" $command "$*" + # Generate $file from $file$extension using the given command. + cat "$file$extension" | $command "$@" >> "$file" + + unset command file }