Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -1766,10 +1766,17 @@
 		])
 	])
 ], [
 	AC_SUBST(RUN_TESTS, "run")
 ])
+
+AC_ARG_WITH(fish_completions,
+	AS_HELP_STRING([--with-fish-completions],
+		[install completions for the fish shell]))
+AS_IF([test x"$with_fish_completions" = x"yes"], [
+	AC_SUBST(FISH_COMPLETIONS, fish)
+])
 
 dnl We don't call AC_PROG_CPP, but only AC_PROG_OBJCPP and set CPP to OBJCPP
 dnl and add OBJCPPFLAGS to CPPFLAGS, thus we need to AC_SUBST these ourself.
 AC_SUBST(CPP)
 AC_SUBST(CPPFLAGS)

Index: extra.mk.in
==================================================================
--- extra.mk.in
+++ extra.mk.in
@@ -30,10 +30,11 @@
 ENCODINGS_SRCS = @ENCODINGS_SRCS@
 EXCEPTIONS_A = @EXCEPTIONS_A@
 EXCEPTIONS_EXCEPTIONS_A = @EXCEPTIONS_EXCEPTIONS_A@
 EXCEPTIONS_EXCEPTIONS_LIB_A = @EXCEPTIONS_EXCEPTIONS_LIB_A@
 EXCEPTIONS_LIB_A = @EXCEPTIONS_LIB_A@
+FISH_COMPLETIONS = @FISH_COMPLETIONS@
 FORWARDING_A = @FORWARDING_A@
 FORWARDING_FORWARDING_A = @FORWARDING_FORWARDING_A@
 FORWARDING_FORWARDING_LIB_A = @FORWARDING_FORWARDING_LIB_A@
 FORWARDING_LIB_A = @FORWARDING_LIB_A@
 INSTANCE_M = @INSTANCE_M@

Index: utils/Makefile
==================================================================
--- utils/Makefile
+++ utils/Makefile
@@ -1,11 +1,12 @@
 include ../extra.mk
 
 SUBDIRS += ${OFARC}	\
 	   ${OFDNS}	\
 	   ${OFHASH}	\
-	   ${OFHTTP}
+	   ${OFHTTP}	\
+	   completions
 
 include ../buildsys.mk
 
 DISTCLEAN = objfw-config
 

ADDED   utils/completions/Makefile
Index: utils/completions/Makefile
==================================================================
--- /dev/null
+++ utils/completions/Makefile
@@ -0,0 +1,5 @@
+include ../../extra.mk
+
+SUBDIRS = ${FISH_COMPLETIONS}
+
+include ../../buildsys.mk

ADDED   utils/completions/fish/Makefile
Index: utils/completions/fish/Makefile
==================================================================
--- /dev/null
+++ utils/completions/fish/Makefile
@@ -0,0 +1,9 @@
+DATA = objfw-compile.fish	\
+       objfw-config.fish	\
+       ofarc.fish		\
+       ofhash.fish		\
+       ofhttp.fish
+
+include ../../../buildsys.mk
+
+PACKAGE_NAME = fish/vendor_completions.d

ADDED   utils/completions/fish/objfw-compile.fish
Index: utils/completions/fish/objfw-compile.fish
==================================================================
--- /dev/null
+++ utils/completions/fish/objfw-compile.fish
@@ -0,0 +1,28 @@
+complete -c objfw-compile -s o -x -d 'Specify the output name (not file name!)'
+complete -c objfw-compile -l arc -d 'Use automatic reference counting'
+complete -c objfw-compile -l lib -x -d \
+    'Compile a library (with the specified version) instead of an application'
+complete -c objfw-compile -l plugin \
+    -d 'Compile a plugin instead of an application'
+complete -c objfw-compile -l package -x -d 'Use the specified package'
+complete -c objfw-compile -l builddir -r \
+    -d 'Place built objects into the specified directory'
+complete -c objfw-compile -s D -x -d 'Pass the specified define to the compiler'
+complete -c objfw-compile -o framework -x \
+    -d 'Pass the specified -framework argument to the linker (macOS / iOS only)'
+# -f* cannot be represented.
+complete -c objfw-compile -s F -x \
+    -d 'Pass the specified -F flag to the linker (macOS / iOS only)'
+# -g* cannot be represented.
+complete -c objfw-compile -s I -x \
+    -d 'Pass the specified -I flag to the compiler'
+complete -c objfw-compile -s l -x -d 'Pass the specified -l flag to the linker'
+complete -c objfw-compile -s L -x -d 'Pass the specified -L flag to the linker'
+# -m* cannot be represented.
+# -O* cannot be represented.
+complete -c objfw-compile -o pthread \
+    -d 'Pass -pthread to the compiler and linker'
+# -std=* cannot be represented.
+# -Wl,* cannot be represented.
+# -W* cannot be represented.
+complete -c objfw-compile -l help -d 'Show this help'

ADDED   utils/completions/fish/objfw-config.fish
Index: utils/completions/fish/objfw-config.fish
==================================================================
--- /dev/null
+++ utils/completions/fish/objfw-config.fish
@@ -0,0 +1,33 @@
+complete -c objfw-config -l all -d 'Outputs all flags + libs'
+complete -c objfw-config -l arc -d 'Outputs the required OBJCFLAGS to use ARC'
+complete -c objfw-config -l cflags -d 'Outputs the required CFLAGS'
+complete -c objfw-config -l cppflags -d 'Outputs the required CPPFLAGS'
+complete -c objfw-config -l cxxflags -d 'Outputs the required CXXFLAGS'
+complete -c objfw-config -l framework-libs \
+    -d 'Outputs the required LIBS, preferring frameworks'
+complete -c objfw-config -l help -d 'Print help'
+complete -c objfw-config -l ldflags -d 'Outputs the required LDFLAGS'
+complete -c objfw-config -l libs -d 'Outputs the required LIBS'
+complete -c objfw-config -l lib-cflags \
+    -d 'Outputs CFLAGS for building a library'
+complete -c objfw-config -l lib-ldflags \
+    -d 'Outputs LDFLAGS for building a library'
+complete -c objfw-config -l lib-prefix -d 'Outputs the prefix for libraries'
+complete -c objfw-config -l lib-suffix -d 'Outputs the suffix for libraries'
+complete -c objfw-config -l objc -d 'Outputs the OBJC used to compile ObjFW'
+complete -c objfw-config -l objcflags -d 'Outputs the required OBJCFLAGS'
+complete -c objfw-config -l package -x \
+    -d 'Additionally outputs the flags for the specified package'
+complete -c objfw-config -l packages-dir \
+    -d 'Outputs the directory where flags for packages are stored'
+complete -c objfw-config -l plugin-cflags \
+    -d 'Outputs CFLAGS for building a plugin'
+complete -c objfw-config -l plugin-ldflags \
+    -d 'Outputs LDFLAGS for building a plugin'
+complete -c objfw-config -l plugin-suffix -d 'Outputs the suffix for plugins'
+complete -c objfw-config -l prog-suffix -d 'Outputs the suffix for binaries'
+complete -c objfw-config -l reexport -d 'Outputs LDFLAGS to reexport ObjFW'
+complete -c objfw-config -l rpath -d 'Outputs LDFLAGS for using rpath'
+complete -c objfw-config -l static-libs \
+    -d 'Outputs the required LIBS to link ObjFW statically'
+complete -c objfw-config -l version -d 'Outputs the installed version'

ADDED   utils/completions/fish/ofarc.fish
Index: utils/completions/fish/ofarc.fish
==================================================================
--- /dev/null
+++ utils/completions/fish/ofarc.fish
@@ -0,0 +1,14 @@
+complete -c ofarc -s a -l append -d 'Append to archive'
+complete -c ofarc -s c -l create -d 'Create archive'
+complete -c ofarc -s C -l directory -r -d 'Extract into the specified directory'
+complete -c ofarc -s E -l encoding -x \
+    -d 'The encoding used by the archive (only tar files)'
+complete -c ofarc -s f -l force -d 'Force / overwrite files'
+complete -c ofarc -s h -l help -d 'Show help'
+complete -c ofarc -s l -l list -d 'List all files in the archive'
+complete -c ofarc -s n -l no-clobber -d 'Never overwrite files'
+complete -c ofarc -s p -l print -d 'Print one or more files from the archive'
+complete -c ofarc -s q -l quiet -d 'Quiet mode (no output, except errors)'
+complete -c ofarc -s t -l type -x -a 'gz lha tar tgz zip' -d 'Archive type'
+complete -c ofarc -s v -l verbose -d 'Verbose output for file list'
+complete -c ofarc -s x -l extract -d 'Extract files'

ADDED   utils/completions/fish/ofhash.fish
Index: utils/completions/fish/ofhash.fish
==================================================================
--- /dev/null
+++ utils/completions/fish/ofhash.fish
@@ -0,0 +1,7 @@
+complete -c ofhash --long-option md5
+complete -c ofhash --long-option ripemd160
+complete -c ofhash --long-option sha1
+complete -c ofhash --long-option sha224
+complete -c ofhash --long-option sha256
+complete -c ofhash --long-option sha384
+complete -c ofhash --long-option sha256

ADDED   utils/completions/fish/ofhttp.fish
Index: utils/completions/fish/ofhttp.fish
==================================================================
--- /dev/null
+++ utils/completions/fish/ofhttp.fish
@@ -0,0 +1,14 @@
+complete -c ofhttp -s b -l body -r -d 'Specify the file to send as body'
+complete -c ofhttp -s c -l continue -d 'Continue download of existing file'
+complete -c ofhttp -s f -l force -d 'Force / overwrite existing file'
+complete -c ofhttp -s h -l help -d 'Show help'
+complete -c ofhttp -s H -l header -x -d 'Add a header (e.g. X-Foo:Bar)'
+complete -c ofhttp -s m -l method -x -d 'Set the method of the HTTP request'
+complete -c ofhttp -s o -l output -r -d 'Specify output file name'
+complete -c ofhttp -s O -l detect-filename \
+    -d 'Do a HEAD request to detect the file name'
+complete -c ofhttp -s P -l proxy -x -d 'Specify SOCKS5 proxy'
+complete -c ofhttp -s q -l quiet -d 'Quiet mode (no output, except errors)'
+complete -c ofhttp -s v -l verbose -d 'Verbose mode (print headers)'
+complete -c ofhttp -l insecure \
+    -d 'Ignore TLS errors and allow insecure redirects'

Index: utils/objfw-compile
==================================================================
--- utils/objfw-compile
+++ utils/objfw-compile
@@ -65,11 +65,11 @@
     -m*             Pass the specified -m flag to the compiler
     -O*             Pass the specified -O flag to the compiler
     -pthread        Pass -pthread to the compiler and linker
     -std=*          Pass the specified -std= flag to the compiler
     -Wl,*           Pass the specified -Wl, flag to the linker
-    -W*             Pass the specified -W flag to the compiler"
+    -W*             Pass the specified -W flag to the compiler
     --help          Show this help
 __EOF__
 }
 
 CPPFLAGS="$CPPFLAGS $($OBJFW_CONFIG $packages --cppflags)"